Posts Tagged ‘17:27’

Agronomic Crop Insects

Friday, September 18th, 2009

Joanne Whalen, Extension IPM Specialist; jwhalen@udel.edu

Soybeans
At this point, the decision to treat for corn earworms should have been made by now. If you have not scouted, be sure to check the latest planted fields. We are seeing a decline in trap catches so hopefully we will not see another hatch. Soybean aphids continue to be a problem in later planted fields. With the projected cool weather, they could be a problem for the next few weeks. Please refer to previous newsletters for treatment thresholds.

Small Grains
Be sure to sample all fields at emergence for aphids, true armyworm and fall armyworm feeding. In past years, we have seen economic damage from all three insect pests.

When it comes to armyworm, we have seen fields destroyed in past years, especially in no-till situations. In many cases it has been true armyworm, although fall armyworm can also cause damage. Although there is no threshold available, you will need to watch for larvae feeding on small plants.

As you make plans for small grain planting, you should consider the following factors when making a treatment decision for aphids. In general, cooler summer temperatures with adequate rainfall, followed by a warm, dry fall are conditions that favor aphid development in small grains, especially in early planted fields. Early fall infestations of the greenbug aphid (which cause direct damage to small grains as well as vector BYDV) are favored by cool, late summer conditions. Since weather has been favorable, be sure to watch fields closely for aphids.

The main reason one would consider aphid control in the fall (except for greenbug aphid that causes direct damage) is the potential for Barley Yellow Dwarf Viral (BYDV) transmission. In areas where you have seen BYDV in the past, where you are planting early, or you have seen direct damage by greenbug aphids, a seed treatment that control aphids (i.e. Cruiser and Gaucho) would be a good control option. Information from Kentucky indicates that planting date is the most important factor determining the intensity of an aphid infestation. If you have a history of aphids transmitting viruses in the fall and you plan to scout for aphids, data from the South indicates that the most important time for controlling aphids to prevent BYDV is the first 30 days following emergence. The second most important time is the second 30 days following emergence. The following link to a fact sheet from Kentucky provides more information on aphids and BYDV in wheat (http://www.ca.uky.edu/entomology/entfacts/ef121.asp). Please refer to the Pest Management Recommendations for Field Crops for materials labeled for aphid control in small grains (http://extension.umd.edu/publications/EB237online/).

Fall Strawberry Notes

Friday, September 18th, 2009

Gordon Johnson, Extension Ag Agent, Kent Co.; gcjohn@udel.edu

Fall is a very important time in the life of strawberries, whether being grown in the multi-year matted row system or in the annual plasticulture system.

During fall, matted row strawberries will continue to grow and develop flower buds on daughter plants that will produce next spring’s crop until dormancy sets in with heavy freezes. Do not neglect weed control during this period of time. In late fall, apply straw between strawberry rows and around plants. This insulates the plants and reduces winter losses.

All plasticulture strawberries should have been planted by now. Later plantings risk significant yield losses because plants will not have enough branch crowns to produce full yields. Three weeks after planting, look at plant establishment. Plants should have produced new roots, have three or more green leaves, and show healthy new growth. In fall, growth should proceed so that the plants are 6-8 inches in diameter before winter sets in. While too little fall growth will greatly reduce yields because of too few branch crowns, excessive fall growth will lead to reduced fruit size because of too many branch crowns. The goal is to have 4-6 branch crowns by spring. Runner removal from plasticulture strawberries throughout the fall will reduce competition with the main plant during branch crown formation.

The main tool we have to regulate crown development in the fall is floating row covers. Crown growth and development occurs when temperatures are above above 50°F. In later plantings or if fall weather is cooler than normal, placing row covers over the plantings will help to maintain heat and keep plants growing and developing. This may mean placing covers as early as the middle of October in some plantings and growers should assess plasticulture strawberry growth in October to decide if early covering will be needed. For normal winter protection, place floating row covers in late November or early December.

End of the Season Vegetable Disease Notes

Friday, September 18th, 2009

Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu

Nematodes in Veggies
Fall is the best time to soil sample for nematode pests such as root knot, lesion, and other plant parasitic nematodes. After fall harvest but before any fall tillage is done, take soil cores six inches deep between plants in the row. Samples should be taken in the root zone of the old crop. Twenty cores per sample should be taken from random spots in the field and placed in a plastic bucket, gently mixed, and a pint of soil submitted for analysis. Large fields should be subdivided into blocks of 15-20 acres each and sampled separately. Nematode test bags and instructions are available for purchase from the county Extension offices. Samples cost $10.00. Fall sampling for root knot nematodes is strongly recommended for fields that will be planted in cucumbers, watermelons, cantaloupes, lima beans or other high-value vegetables where root knot could reduce production. Forms and instructions are also available on the web at http://ag.udel.edu/extension/pdc/index.htm.

Fall Sanitation
In vegetable production it is not a good idea to leave old crop residue in the field any longer than necessary. If the crop is allowed to survive after harvest, fungi that cause many diseases continue to increase on the surviving plants. This allows higher numbers of the fungus to potentially survive until next season. Sanitation (plowing or disking the old crop) will help prevent pathogen carry-over.

Last Issue of Weekly Crop Update for 2009

Friday, September 18th, 2009

Emmalea Ernest, Extension Associate – Vegetable Crops; emmalea@udel.edu

This is the last issue of Weekly Crop Update for the 2009 season. I hope that this newsletter has been a useful resource to you as you dealt with the challenges of this past growing season. My thanks to the Extension specialists and agents who have contributed articles this year — the WCU would not be possible without them, and to our office staff at the REC, who make sure the WCU gets to our fax and mail subscribers.

As editor of WCU, I appreciate your comments and suggestions for improvement of this publication. You can contact me at the email address above or at (302) 856-7303. I am especially interested to hear from email subscribers whether you use the pdf or blog version of WCU. 

Best wishes for a safe and prosperous fall harvest season. I look forward to seeing many of you at meetings this winter.

Kind regards,

Emmalea

2009 WREC Pumpkin and Sweet Corn Twilight Meeting

Friday, September 4th, 2009

Tuesday, September 22, 2009     4:30-7:00 p.m.
Wye Research and Education Center
211 Farm Lane, Queenstown, MD
(signs will be posted)

Please join University of Maryland Specialists Jerry Brust, Bryan Butler, Galen Dively, and Mike Newell for review and discussion of current field research and grower concerns. Participants can view a replicated trial of 30 pumpkin varieties, plus see and taste 7 “Bt” sweet corn varieties.

A light dinner fare will be provided. No pre-registration is required.

For additional information, contact Mike Newell @ mnewell@umd.edu or (410) 827-7388; http://www.wrec.umd.edu.

If special assistance is required to attend this meeting, please contact Debby Dant @ (410) 827-8056 by September 15, 2009.

Pole Lima Breeding Line Evaluation

Friday, August 28th, 2009

Thursday, September 24, 2009     5:30-7:00 p.m.
Carvel Research and Education Center
16483 County Seat Hwy.
Georgetown, DE 19947

Attention Pole Lima Bean Enthusiasts!

Come help to evaluate the pole lima varieties and breeding lines being tested at the Georgetown research farm. Lines to look at include twelve varieties, thirteen hybrids and four diverse populations developed from crosses.

Please contact Emmalea Ernest by Tuesday, September 22 if you plan to attend: (302) 856-7303 or emmalea@udel.edu.

2009 Mid-Atlantic Grass-Finished Livestock Conferece: “Merging the Art and Science of Grass Finishing”

Friday, August 21st, 2009

Friday, October 23 and Saturday, October 24
Holiday Inn Conference Center
Staunton, VA

Topics Covered
Forage Systems for Grass Finishing
Alternative Marketing Outlets
Small-Scale Processing Facilities
Healthy Grazing Systems
Supplementation in Pasture Finishing
Factors Affecting Meat Quality
Genetics for Grass Finishing
Meat Cutting and Cooking Demo

Early registration is $200, and must be postmarked by September 15, 2009.

Brochure and registration information is available here: http://www.rec.udel.edu/update09/grassfinished.pdf  or contact Margaret Kenny at (434) 292-5331 or makenny@vt.edu.

Equine Pasture Walk

Friday, August 14th, 2009

Tuesday, September 29, 2009     5:30-7:30 p.m.
University of Delaware Webb Farm
508 S. Chapel St., Newark, DE

Come and meet University of Delaware’s new Equine Extension Specialist, Dr. Carissa Wickens. Learn about rotational grazing and management practices used on-farm at UD. Get help with decisions regarding pasture nutrient needs and the rising cost of fertilizers and amendments. Learn about NRCS programs available to help you and your farming operation.

Experts will be on hand from the University of Delaware and the Natural Resource Conservation Service (NRCS) to answer your questions!

This meeting is free and everyone interested in attending is welcome. Please bring a folding chair.

Nutrient management and CCA credits will be available.

Please preregister by September 25. To register, request more information or if you require special needs assistance for this meeting, please call our office at (302) 831-2506.

See you there!
Anna Stoops, New Castle County Ag. Extension Agent