May 30, 1997 Vol. 97.5

IN THIS ISSUE:

Calendar

• Weed Field Days - Landisville, July 10 and Rock Springs, July 11, 1997
• Northeast Branch American Society of Agronomy - College Park, MD - July 13 to 16, 1997
• Penn State Crops Clinic - Rock Springs Agronomy Farm - July 22 and 24, 1997
• CCA Exam - PDA Building in Harrisburg - August 1, 1997
• NRCS Program on Soil Conservation postponed until September 23 & 24, 1997

Certified Crop Adviser Corner

Pest Management

• Herbicide Injury Symptoms
• Multiflora Rose Management in Late Spring
• Insect Alerts
• Potato Leafhopper in Second Cutting Alfalfa
• Black Cutworm Outbreak

Agent's Corner

• Adams
• Blair
• Dauphin
• Juniata

Degree Day Accumulations

Register Now for the 25th Annual Weed Control Research Tours at Penn State

Certified Crop Advisor Corner:

FUTURE PROGRAMS - MARK YOUR CALENDARS!

1. Weed Control Tours - July 10 and 11 - Registration attached.
2. Penn State Crops Clinic - July 22 and 24, 1997. As in the past, the program is repeated each day.
3. Northeast Branch American Society of Agronomy - July 16, 1997 The Northeast Branch of ASA is sponsoring a half day session for Certified Crop Advisers on July 16, 1997 at the University of Maryland campus, College Park, MD. The program is designed to provide 4 CEUs, one in each of the competency areas. You should be receiving, by mail, additional information and registration forms shortly.
4. Soil Conservation and Nutrient Management Planning - September 23 and 24, 1997. This program is being developed by the Pennsylvania Agronomic Products Association, Penn State University and the National Resource Conservation Service. It will be held at the Dauphin County Agricultural Center, Dauphin, PA. It is replacing the July 23 program at Rock Springs that was announced earlier.

Elwood Hatley

Pest Management:

HERBICIDE INJURY SYMPTOMS

With the prolonged cool weather we have been experiencing over the last month, the potential for herbicide injury is real. During the next few weeks, scout crops to assess the need for weed control measures and potential herbicide injury problems. People have a tendency to blame injured or unhealthy looking crops on herbicides. Although herbicides certainly can and will cause crop injury, be sure you know the entire story before drawing conclusions. For example, in some areas we have had a recent light frost which can be confused with triazine herbicide injury. Unless the injury symptoms are characteristic of the herbicide mode of action which is suspect, there may be some other cause or problem. Injury symptoms for herbicides belonging to seven different classes based on mode of action follow:

Growth regulators -
2,4-D, Banvel, Clarity, Hornet, Marksman, MCPA, Scorpion III, Stinger:
Grasses- Rolled leaves, fused brace roots, stalk bending, brittleness, sterile or multiple florets
Broadleaves- stem twisting, callus formation, leaf malformation (cupping, crinkling, parallel veins, strapping).

Amino acid synthesis inhibitors -
Accent, Basis, Basis Gold, Beacon, Broadstrike, Classic, Canopy, Exceed, Hornet, Pinnacle, Permit, Pursuit, Roundup, Scorpion III, Scepter, Skirmish:
Grasses-- stunting, intervenal chlorosis to necrosis, purpling, root inhibition, improper unfurling, rat tail.
Broadleaves- stunting, chlorosis, red to purple venation, inhibited terminal and lateral buds (meristems).

Lipid or fatty acid synthesis inhibitors -
Injury to grass crops may be due to misapplication or application under warm, humid conditions (i.e. SR corn) - Assure II, Fusilade, Fusion, Matador, Poast, Select:
Grasses only- chlorosis to necrosis of newer tissue, whorl leaves separate from the rest of the plant, discoloration of meristem.

Seedling growth inhibitors -
Potential common problem to corn under cool wet conditions, cloddy soils, compaction, and slow emergence.
Root- Prowl, Treflan: Stunting, purpling, root inhibition, swollen and club-shaped roots, swollen hypocotyl-coleoptile.
Shoot- Bicep, Bullet, Dual, Frontier, Harness, Micro-Tech, Partner, Surpass, Sutan, Topnotch: Stunting, poor emergence, leaf-out underground, improper unfurling, buggy whipping, leaf crinkling or puckering, bud seal.

Photosynthesis inhibitors -
Injury from mobile herbicides more common under cool wet conditions. Injury from nonmobile post products more common under hot humid conditions.
Mobile - atrazine, Bladex, Princep, Lexone, Sencor, Lorox: Chlorosis to necrosis beginning on leaf margins and older leaves, leaf tips on grasses, new growth unaffected.
Nonmobile - Basagran, Buctril, Laddok: Chlorosis and necrosis, contact-type burn. Corn or soybean yield reductions are rare from this type of injury.

Cell membrane disrupters -
Injury more common under warm humid conditions - Blazer, Cobra, Reflex, Resource: Rapid water soaked appearance (hours), necrotic speckling or lesions, new growth unaffected. Soybean yield reductions are rare from this type of injury.

Pigment inhibitor -
Injury to soybeans rare. Carryover injury to corn or small grains more common - Command, Commence, Authority One-Pass: Chlorosis to bleaching or whitening of susceptible plants. Corn often recovers from Command carryover injury if less than 50% of the plant remains green.

Bill Curran

MULTIFLORA ROSE MANAGEMENT IN LATE SPRING

As spring progresses, multiflora rose begins its growth and eventually will bloom in late May/early June. Several tactics can be used to control this problem weed and these methods will be briefly discussed.

Mechanical control methods include mowing, which requires repeated mowings per season for several years, and excavating, which involves pulling individual plants from the soil with heavy equipment, can be costly, time-consuming and laborious. However, these are viable means for multiflora rose management. Also, management techniques which include biological controls have been used. Two of the more prominent biocontrol agents are rose rosette disease (RRD) and herbivores such as goats or sheep. RRD is a virus which is slowly spreading into our region of the country. Multiflora rose plants infected with RRD usually die within two years. Though RRD may not eradicate the multiflora rose problem, it should help reduce it over the long run. If managed properly, goats and sheep can help control multiflora rose. Research has shown that initially 8 to 10 goats and/or sheep pastured with compatible livestock (cattle) can help reduce rose and other brushy infestations.

Although the above control practices help, several herbicides provide good control of multiflora rose, especially when applied during the bud to bloom growth stages. Three foliar applied herbicides suggested for late-spring/summer are Ally, Crossbow and Roundup. Roundup has been more effective in PSU research at fall application time.

Ally can be used as a broadcast or spot treatment. Apply Ally at a rate of 0.3 oz/A plus a surfactant for broadcast treatments or 1.0 oz/100 gallons water plus surfactant for spot treatments. Applications should be made in the spring, soon after plants are fully leafed-out. Rose plants must be less than 3 feet tall for treatment to be effective. There is no application to grazing interval for Ally.

Foliar applications of Crossbow can be effective on multiflora rose. For spot treatments, use 4 to 6 oz/3 gallons water and spray until foliage is uniformly wet. For broadcast applications, use 1.5 to 4 gallons of Crossbow in enough water to deliver 10 to 30 gallons of spray per acre. Early to mid June is an excellent time to make these applications. Follow-up treatments may be necessary. An interval of 14 days is required for lactating dairy if using 2 gallons/A or less.

Roundup Ultra can be used as spot treatments on isolated patches of multiflora rose. Apply a 1 percent solution (1 qt/25 gallons water) of Roundup Ultra with a hand-held sprayer. Uniformly wet leaves and green stems, but avoid runoff. Application should be made in late summer or early fall when plants are actively growing (after fruit formation). A 14 day interval is required for grazing animals.

No matter which control tactic is used, follow-up maintenance practices are a must for long-term control. Removal of dead brush, annual mowing and adequate soil fertility are examples of practices that should be used to maintain control of multiflora rose and in turn, will encourage pasture growth.

For more information on multiflora rose and its management refer to the publication Agronomy Facts 46: Multiflora Rose Management in Grass Pastures. A copy can be obtained through your local county extension office. In addition, a new Ohio State University and University of West Virginia publication titled Multiflora Rose Control (Bulletin 857) is now available in hardcopy and via the world wide web. The web site is: www.ag.ohio-state.edu/~ohioline/ b857/index.html.

Dwight Lingenfelter

INSECT ALERTS

Black cutworm - The University of Maryland is reporting extremely high black cutworm moth captures in pheromone and/or blacklight traps. Evidence of injury to small corn plants by small larvae are beginning to show up in Maryland and Pennsylvania. See the article by Galen Dively, University of Maryland for details on management.

Alfalfa Weevil - Most areas of Pennsylvania have accumulated enough degree days for alfalfa weevil injury symptoms to become visible. However, the cool spring conditions have slowed weevil development while alfalfa has reached the stage for cutting. Therefore, most alfalfa that is harvested in a timely fashion should avoid injury by the pest. Also, because of last years wet conditions, alfalfa weevil populations appear to be low across the state. The cool weather has delayed development of alfalfa weevil larvae so most are still in early instars. Cutting and harvest of alfalfa fields should remove the large majority of larvae. Those larvae that are not removed in the field, will be exposed and desiccate or eaten by birds and other predators. The few larvae that do survive may feed on developing alfalfa shoots. Therefore, keep an eye on regrowth in fields that had heavy infestations of alfalfa weevil larvae prior to cutting.

Seed Corn Maggot - My earlier prediction that seed corn maggot injury would be low this year may be wrong. Some reports of stand reductions are coming in across the state. These are typically associated with fields that had heavy manure applications plowed down. The initial population that resulted from overwintering adults has completed its life cycle and is now emerging as first generation adults that will be searching for fields to deposit their eggs.

European corn borer - Expect to see overwintering adult European corn borer moths within the next two weeks in southern and western areas of the state, in about three weeks in central Pennsylvania, and four to five weeks in northern and higher elevations of the state (see degree day chart). Overwintering adult flights occur when 378 to 918 degree days have accumulated after January 1. The peak flight should be at about 558 degree days. The peak of egg hatch is at about 648 degree days. Injury should begin to show up soon after this time.

Cereal leaf beetle - There has been no indication that this pest is causing problems in small grain crops in the state. However, some activity has been noted in Maryland and Virginia.

Corn leaf and English grain aphid - No indication of problems so far this year. However, watch the wheat as it begins to head.

POTATO LEAFHOPPER IN SECOND CUTTING ALFALFA

Potato leafhopper -Although the cool and dry spring conditions have been less than ideal for corn growth and development, they have delayed northward movement of leafhoppers into Pennsylvania and reduced the potential for high potato leafhopper populations in the second cutting. Because potato leafhopper is a migratory insect that overwinters in the states that border the Gulf of Mexico, it needs the right weather conditions to move northward in the spring. Conditions that favor northward movement of the pest are low pressure cells that develop in the Gulf of Mexico forming major storm fronts and a high pressure area over the upper Midwest. Under these conditions, major spring storm fronts move up the Mississippi River Valley and then eastward into the northeastern U.S. Potato leafhopper adults, primarily females, initiate behavior that lead to them being drawn up into the clouds and transported northward. Models estimate that leafhoppers can be moved from the Gulf of Mexico into Pennsylvania within five days.

Because northward movement of potato leafhopper occurs only under these conditions, higher numbers of leafhoppers in Pennsylvania alfalfa are associated with springs when storm fronts originating in the Gulf of Mexico start moving into the state early and frequently. So far this year we have had no storms that fit this pattern, therefore, potato leafhoppers have not arrived in most areas of the state. It is possible, that some leafhoppers may arrive in the southeastern areas of the state on storms that originate in the Atlantic Ocean and move up the Atlantic coast. To anticipate the arrival of potato leafhopper in the state, watch the origin of developing storm fronts and how they track into Pennsylvania. When a storm has originated in the Gulf of Mexico and moved into Pennsylvania, you should expect to see potato leafhopper adults in alfalfa fields.

You should begin scouting alfalfa fields once the regrowth, following the first cutting, reaches a height of two to four inches. There are two method that can be used to scout alfalfa fields for this pest: 1) fixed scouting and 2) sequential scouting. Fixed scouting involves using a 15" sweep net to take 20 sweeps at five locations in the field. The five locations should be sampled at random or in representative areas of the field. It is never a good idea to do all your scouting in one corner or area of the field, because leafhopper populations first buildup along the margins of fields. They also tend to aggregate in the field, so some areas have high numbers while others have few leafhopper. Sequential sampling involves a similar protocol, but is designed to save time. Economic thresholds for the fixed scouting method are in the publication, "A Pest Management Program for Alfalfa in Pennsylvania", Extension Circular 284. For new seedling, economic threshold values should be about 1/2 the thresholds for established stands.

To use a sequential sampling approach you again need a 15" sweep net. However, instead of collecting 20 sweeps at each of five locations, you take 10 sweeps at three locations and then stop and compare the total number of leafhoppers collected in 30 sweeps against the values in Table 1.

For example, if your alfalfa were 3 to 6 inches tall and you found < 9 total leafhoppers in 30 sweeps (3 samples), then there would be no need to sample at additional locations in the field. Your decision would be not to treat at this time and return to the field in a week to 10 days. If you had found > 20 leafhoppers per 30 sweeps, then treatment would be recommended and you could stop scouting until the next cutting. However, if you found between 10 and 19 leafhoppers in 30 sweeps, you would not have enough information to make a management decision and you would need to take 10 sweeps at another location and then compare the cumulative total number of leafhoppers collected with Table 1. As long as your numbers stay in the continue sampling range, you continue to sample at additional locations. There is no need to sample at more than 10 locations. If you are still in the continue sampling category, then select the management option (treat or don't treat) that the cumulative number of leafhoppers collected is closest to. A number of insecticide products are available that offer good control of the pest (See Agronomy Guide, Alfalfa section). Select the product that has a harvest interval that is compatible with your estimated harvest date and a cost that fits your budget. If leafhopper numbers are high and harvest is a way off use the higher rates. If the crop will be harvested within a week to 10 days and leafhopper numbers are moderate, use the lower rates. If the alfalfa is greater than 12 inches high, it is usually better to cut five days early rather than spray, because spray equipment tires can cause harvest loss and permanent damage to the stand.

BLACK CUTWORM OUTBREAK -

(Galen Dively, University of Maryland)

Numerous field reports during the past week have verified predictions of outbreak levels of cutworm activity. Because of record high numbers of moths captured in early April and the lateness of the corn crop, conditions are ideal for black cutworm injury. Infestations reported thus far consist primarily of early instar larvae (less than 3/8" in length), and the majority of injury observed is due to leaf feeding - not cut plants. Levels ranging to 30% damaged plants are not uncommon, with some fields showing 1-2% severed plants. Because the cool weather has prolonged egg laying and hatch, infestations of cutworms of variable sizes are expected during the next 2-3 weeks. The black cutworm develops through 7 instar stages which vary in size, feeding behavior, and duration. Young cutworms feed above ground usually on corn foliage and weeds until they reach about 3/4 inch. Generally, the most serious injury to corn takes place after the 4th instar stage. Older worms feed on the stem at ground level or below and sever the plant. One cutworm can sever 4 to 5 plants during its larval development from 5th instar to pupation. Cutworms also can burrow into the base of larger plants and cause stunting or death. To understand how long it takes a cutworm to develop, Table 2 gives estimated developmental times for two temperature regimes. It is difficult to predict a cutworm infestation in any given corn field. However, the following field features are often associated with cutworm problems: 1) minimum or no-till continuous corn or no-till corn in soybean stubble. Egg laying moths are attracted to the surface trash and weeds associated with no-tillage. Also, larval survival increases as tillage of the soil decreases; 2) poorly drained soils because the moths are attracted to moist soil surfaces; 3) presence of early spring weed cover before spring tillage or planting. Weeds such as chickweed, dock, yellow rocket, and coarse grasses provide attractive egg laying sites and food for young cutworms before corn is planted; 4) late tilled and planted fields because preplant conditions are more favorable for cutworm survival and development; and 5) fields located adjacent to heavy permanent vegetation, such as woodlots, ditches, etc. Generally, studies have shown that destroying weeds with herbicides and/or tillage 7 or more days prior to planting reduces the chances of cutworm damage because many larvae starve before the corn emerges. However, under the extended moth activity that has occurred this spring, don't count on this cultural practice working. Fields that have been conventionally tilled for several weeks but have yet to be planted should be the least likely to encounter cutworms. However, there have already been reports of economic levels of cutworms in conventionally-tilled corn.

Early detection is necessary to reduce crop losses and achieve successful control. One should first focus attention to those fields that fit the above characteristics associated with cutworm problems. Fields that have been treated with preplant insecticides should also be scouted, especially if applications were made 2-3 weeks ago and the corn has just emerged. None of the preplant insecticides will give more than a week of residual activity. If dry soil conditions exist in high-risk fields, sampling should begin before plant emergence because larvae have been known to feed underground on the young sprouts before plants emerge from the soil. Otherwise, begin sampling as the plants crack the surface. Leaf feeding is the first sign that cutworms are present. Look for small, irregular holes in leaves and missing or cut plants. Make a note of leaf feeding that may be due to cutworms that are too small to cut plants and then check these areas again in 24 to 48 hours. If cutworms are present, examine at least 10 sets of 20 plants throughout the field and record the number of cut or missing plants. At the same time, look under clods and trash and dig 1 to 2 inches deep around the base of damaged plants to find the cutworms. Because variable sizes of cutworms are likely to be found, it is important to estimate the average size as well as the number of cutworms per 100 plants.

Treatment decisions may be more difficult this spring because of variable sized cutworms. Also, the longer duration of the last two instar stages complicates decisions because it is hard to know if these worms are just beginning to cut plants or are close to pupation. Field infestations that range in size from 3/4 inch to 1 1/4 inches (fourth to sixth instars) can feed on corn plants for 10 to 14 days more. Larger cutworms greater than 1 1/2 inches in length are probably close to pupation and should stop feeding.

After corn plants have emerged and cutworms have been found, the preferred control option is to apply a treatment of Ambush 2E, Pounce 3.2EC, Asana 1.9EC, Warrior 1EC, or Lorsban 4E, only when the economic threshold has been reached. A directed application over the row with a minimum of 10 gallons finished spray per acre will give the best results. As a general guideline, a treatment should be applied on 1 to 2 leaf corn when more than 10 percent of the plants show fresh leaf feeding. At the 3 to 4 leaf stage, treatment should be applied if 5 percent of the plants are cut and there are two or more cutworms per 100 plants. These guidelines are based on feeding at or above ground level. If cutworms are feeding below ground as a result of dry weather or other conditions (i.e. seed furrow is not closed), the guidelines may not apply.

The potential yield losses caused by cutworms depend upon the stage of corn plant growth. A seedling plant that is completely severed at the soil surface will regrow if the growing point was not injured. The growing point on corn is below the surface until approx. 6 leaves have completely unrolled. Thus, a cut plant may still contribute to grain yield. Corn growth stage and cutworm size should be considered when making a spray decision. For example, the treatment threshold should be increased for very young seedlings (1-3 leaf stage), particularly if older larvae are present. Treatment to control 6th and 7th instar cutworms (greater than 1 inch long) on 1-2 leaf corn may not be needed at all regardless of the injury level. On the other hand, a lower threshold is appropriate if young cutworms are attacking corn with 3 or more leaves fully emerged. The table above provides more specific management thresholds dependent on cutworm age and corn growth stage.

Note: Economic thresholds used in Pennsylvania are similar and show lead to the same management decision.

Dennis Calvin

AGENT OBSERVATIONS

ADAMS COUNTY

Welcome to Adams County, home of orchards, cows and plenty of red, poorly drained soil.

Rainfall has been lacking this spring, as we received 1.5" for April (2" below normal) and 1.2" thru May 24 according to the Fruit Research Lab.

Most of the early corn took three weeks to emerge and is currently 4-5" tall. The pre-emergence herbicide programs for corn appear to be working as the county had occasional showers. The early soybeans have emerged and are 3" high.

Because of the daily windy conditions, some applicators have had to switch their corn herbicide programs from pre to post emergence and most of the soybean herbicide, will be a post emergence program.

Wheat heads have just begun to emerge from the flag leaf on May 20th. Barley heads are smaller than normal. Grain yields will probably be reduced 25-30% across the county. Some Dairy producers are chopping their barley and wheat for forage as protection against the dry weather.

First cutting of alfalfa has begun and is approximately 40% complete. Most forage growers are experiencing a yield reduction do to the cooler, drier weather. Yield reductions for rye and alfalfa forage may approach 50% in some areas. The timothy appears to be the most affected from the dry weather.

Special attention is needed to determine harvesting moisture for alfalfa haylage. With the cooler but windy days, the haylage is drying faster then anticipated.

Larry Swartz
Adams County

BLAIR COUNTY

As of May 27 crop development in Blair county looks good although certainly behind normal as in most areas. Practically all our corn is in the 1 to 2 leaf stage. Alfalfa is just now coming under first cutting. It is being harvested pre-bud and windrows appear about one-third less than normal. Spring-seeded alfalfa is in the third trifoliate. Barley is beginning to ripen and oats are 5 to 6 inches tall. There is hardly a no-till corn field left in the county and fields look very weed-free as a result. It will be interesting to observe weed development which may result from all the fine surface tillage. Alfalfa fields were heavily infested with yellow rocket. There are no signs of insect activity on any of our crops.

Phi Rzewnicki
Blair County

DAUPHIN COUNTY

Timely weekend rains, May 25, provided needed soil moisture for crop germination and development. The average amount was approximately 1.75 inches without any heavy showers. Followed by warming temperatures and sunshine crop development is rapidly proceeding. Corn crop germination has been excellent with few fields having any stand problems. In most situations germination has been >95%. In one location I observed, a planter mistake lead to a stand of 43,000 ppa. Cutworms have been observed, no weed breakthroughs yet but many producers are anticipating a post application due to the lack of any incorporating showers. Small grains are developing with most winter grains in the heading stage or later. No disease problems reported. Extremely short straw length noted by producers who anticipate a short straw supply next season. Acres of spring oats seem down in total. Slow early season development on those limited acres. No sign of cereal leaf beetle yet. Forage harvest started the week before Memorial Day weekend. Tonnage is reduced by 33 to 50% in both alfalfa and orchardgrass. Fall 96 seeded alfalfa stand infected with sclerotinia has stabilized and approximately 66% of the stand remains. No further evidence of disease is present. Those infected crowns have died and remaining crowns have continued growth.

Paul Craig
Dauphin County

JUNIATA COUNTY

As a result of a great two inch rain over the Memorial Day Weekend you can "hear the crops growing" as I am writing these notes. The majority of our corn is planted and much has already emerged. The tallest corn is in the 2-3 leaf stage. The success of pre-emergence weed control programs will become obvious this week as the rains will cause the annual weeds to start growing. So far most of the fields I have seen look fairly clean. Soybean planting is well underway with some fields beginning to emerge.

One observation I have made is that we are seeing more conventional and minimum tillage in our area compared to years past. The mulch tillage tools followed by large packers seem to be resulting in a fairly smooth, firm seed bed. This combination of tools also leaves a moderate amount of residue on the soil surface to help with erosion control. The heavy residue from last year's corn crop did cause problems for some tillage tools this spring.

The alfalfa is mostly in the bud stage and many producers have begun first cutting. Most fields seem to be shorter than normal but harvest needs to start soon if we are to get four or five cuttings in this year. The grasses are also shorter than normal this spring; in some spots the orchardgrass headed out at 15 - 20 inches tall. Pasture regrowth was extremely slow during the past two weeks, however with our recent rain this situation will improve.

The only insect pests that have been reported up to this point were alfalfa weevils. These reports were similar to previous years in that the weevils were working on a few southern facing fields. A few producers have applied insecticide in some of their worst fields.

Greg Hostetter
Juniata County

1997 DEGREE DAY ACCUMULATIONS:

To track corn and insect development, compare the 1997 cumulative degree-days shown in Table 1 to the required values in Tables 5 and 6. Choose a location that is closest to your site when making comparison.

The cumulative degree day value given is for the number of degree days needed after tillage of manure or green surface vegetation before it is recommended to plant corn in a field to avoid injury from seed corn maggot.

Dennis Calvin

REGISTER NOW FOR THE 25TH ANNUAL WEED CONTROL RESEARCH TOURS AT PENN STATE

The Penn State Weed Tours are quickly approaching. The following information outlines the dates, locations, and types of research you can see by attending. If you would like to join us for one or both tours, please call, fax, email, or mail in the registration forms that are attached.

Tour Agenda

July 10, 1997; 9:00 - 2:00 pm - Landisville, PA (Southeastern Field Research and Extension Center, 2 miles NW of Landisville) see attached map for location.

Weed control in corn and soybeans

• EPP and PRE weed control in no-till corn
• Tankmixtures for weed control in corn
• Weed control in SR corn
• Residual grass control in corn
• Pre/Post weed control in Liberty Link corn
• Roundup Ready corn - weed control systems
• Roundup Ready corn - narrow vs wide row
• Accent + Exceed adjuvant study
• Authority Broadleaf in Roundup Ready soybeans
• EBNS control in Stacked Trait soybeans
• Weed control in RT soybeans
• Select and V53482 for Double-Crop burndown and residual
• Effect of Boron and herbicide on EBNS control
• Burcucumber control in IR corn - P. Brubaker Farm
• Burcucumber control in narrow row GR corn - P. Brubaker Farm
• Effect of tillage and row spacing on burcucumber control in soybeans - P. Brubaker Farm
• Burcucumber control in RR/STS soybeans - P. Brubaker Farm

July 11, 1997; 8:30 - 3:00 pm - Penn State Agronomy Farm, Rock Springs, PA

(Meet at the Agronomy Farm, Rock Springs, Rt. 45 west of State College)see attached map for location.

Weed control in corn, soybeans, alfalfa, and vegetables - vegetable tour following lunch with Dr. Mike Orzolek

• Weed control in alfalfa
• Roundup Ultra preharvest on alfalfa
• Roundup Ultra postharvest on alfalfa
• Weed control in RT IMI corn
• Pre/Post weed control in RT corn
• Bicep + Broadstrike tank-mixes in RT corn
• Basis Pre/Post for TR lambsquarters control in field corn
• Roundup Ready and Liberty Link corn NT weed control
• Balance for weed control in reduced-tillage corn
• Sencor Pre/Post on reduced-tillage corn
• Postemergence broadleaf weed control in corn
• Bicep + Peak Pre tank-mixes in Rt corn
• BAS 662 for broadleaf weed control in reduced-tillage corn
• Corn tolerance to chloroacetimides
• Postemergence broadleaf weed control in corn
• Pre/Post Roundup Ready soybean weed control
• Herbicide programs on Stacked Trait soybeans
• Axiom Pre fb Post in RT soybeans
• Cobra and V53482 tank-mixtures for weed control in soybeans
• Authority Broadleaf weed control in soybeans
• Liberty Link soybean trial
• Annual weed competition on Rt Roundup Ready soybean yield
• Sencor in Roundup Ready no-till soybeans
• Burndown and residual control in soybeans
• Roundup Ultra no-till burndown timing study
• Residual grass control - plant back study
• Herbicide banding and cultivation demo
• Rye cultivation study
• Weed control in vegetables

For Landisville (July 10, 1997) and the Rock Springs Tour (July 11, 1997)

Please Register by Friday, June 30, 1997

Mail the attached registration form, call, fax or email: Send no money with this registration. You will be charged for registration and lunch at the event.

Lisa Crytser
116 ASI Bldg.
Department of Agronomy
University Park, PA 16802
(Phone: 814-865-2543)
(FAX: 814-863-7043)
crytser@agronomy.cas.psu.edu

Landisville tour (July 10)

Number attending:

Please list name, organization and address of persons included

Name:

Organization:

Address:

Phone:

Rock Springs tour (July 11)

Number attending:

Please list name, organization and address of persons included

Name:

Organization:

Address:

Phone:

William S. Curran
Associate Professor Weed Science
email: wsc2@psu.edu

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Website Address: http://fcn.agronomy.psu.edu/