Continue to scout for aphids. A treatment should be applied for aphids if 10 to 20 percent of the plants are infested with aphids.
Be sure to watch for economic levels of leafhoppers in fields throughout the state. Remember, most labeled insecticides will only provide 7-10 days of control. In fields with pin pods, you should sample for earworm, lygus and stinkbugs. A treatment should be applied if you find one corn earworm per 6 foot of row or 15 tarnished plant bugs and/or stinkbugs per 50 sweeps. Lannate, Mustang or Capture can be used to control all 3 insects on lima beans.
At the present time, all peppers that have fruit ½ inch in size or larger should be sprayed on a 7-10 day schedule for corn borer and pepper maggot control. We are also starting to see an increase in aphid populations in peppers. Remember a continuous pyrethroid program should not be used to avoid aphid explosions.
In areas where we have started to see an increase in corn borers moth catches - Bridgeville, Dover, Harrington, Milford , Laurel and Seaford ---a corn borer spray will be needed at the bud and pin stages on processing snap beans. Orthene or Address should be used on processing snap beans for corn borer control at the bud and/or pin stages. After these stages, Lannate, Capture or Mustang should be used. In these same areas, you should begin treating fresh market snap beans for corn borers on a 7-day schedule from the pin stage until harvest. Lannate, Capture or Mustang should be used. Continue to watch for defoliators feeding on the pin pods. A treatment should be applied if defoliators are feeding on pin pods. Lannate, Asana, Mustang or Capture will provide the best control of defoliators. Be sure to check for the most recent trap catches in your area by calling 1-800-345-7544(in-state), 1-302-831-8851(out of state) or checking our website - http://www.udel.edu/IPM/traps/latestblt.html.Trap catches are updated on the IPM website three times per week. We have also included a new link on this page for ECB moth trap thresholds for processing snap beans.
Fresh market silking sweet corn
should be sprayed on a 4-day schedule except in the Harrington and
Pickling Cucumber Yields and Quality -Ed Kee, Extension Vegetable Crops Specialist; email@example.com
The varieties used for the machine harvest pickling cucumbers are female (gynoecious or predominantly female) hybrids. The typical ratio in a mixture of seed is 88% female hybrid and 12% male variety to provide the pollen for fertilization and subsequent fruit set. The use of the female hybrids at high populations (50-60,000 plants per acre) helps achieve a concentrated set of fruit, which facilitates the once-over mechanical harvest.
High temperatures will induce male flower development in the female hybrids. This is aggravated by long days and any moisture stress. We have seen examples of this in some non-irrigated corners of fields or in fields where mechanical problems have hindered irrigation. Other stresses, such as fertility, herbicide injury, or soil compaction can also cause a change in sex expression.
Yield reductions obviously occur under such situations, but increased deformed fruit, known as crooks and nubs also occurs. Pickling cucumbers that are blossoming, setting fruit, and planted in high populations for mechanical harvest are using over ¼ inch of water per day when temperatures are in the 90s.
Good irrigation management is needed to maximize the investment in production and in bee rentals and to achieve good yields and quality.
Laurel Auction Market Opens - Tracy Wootten, Extension Associate – Vegetable Crops, firstname.lastname@example.org
The Laurel Auction Market officially opened on
NOTE: For this greenrow date and location we have accumulated 644 P-days as well. P-days are a measure of potato plant growth somewhat similar to growing-degree-days. When 400 P-days have been exceeded conditions for early blight infection are more favorable and disease may begin to show up 5-7 days later. Continue fungicide sprays for early blight.
With harvest underway I have seen the first samples of pink rot. Look for darkened lenticels and infection from the stem end. When infected tubers are cut the infected creamy white but firm potato flesh turns pink in 10-15 minutes depending on conditions. Grade carefully to remove infected potatoes. Leave any areas in the field and harvest after the potatoes have decayed. Pink rot favors low areas or compacted areas.
Be on the lookout for foliar diseases on irrigated sweet corn. We have seen some isolated outbreaks of gray leafspot and Northern corn leaf blight on processing sweet corn. Unfortunately, there is not much information from our area on the impact of these diseases on quality or yield. Under most circumstances fungicides are not warranted but Tilt, Quadris, and mancozeb are labeled for control of most foliar diseases of sweet corn. Bravo (chlorothalonil) is not labeled for processing sweet corn.
Also be on the lookout for sweet corn rust. Look for the small red pustules, once observed on corn in the whorl stage or earlier, apply a fungicide such as Bravo (fresh market only), Quadris, Tilt or mancozeb for control. Older corn will not benefit from an application.
We can still find Japanese beetles and corn rootworm adult beetles feeding on silking corn. As a general rule, a treatment is recommended on silking corn if you can find 4-5 Japanese and/or corn rootworm beetles per plant and they are clipping silks to less than ½ inch long before 50% pollination.
Continue to watch for spider mites, leafhoppers and defoliators in soybeans. A treatment for leafhoppers is recommended when you find at least 4 per sweep in drought stressed beans or 8 leafhoppers per sweep in actively growing soybeans. If defoliators are present, the treatment threshold is 30% defoliation prebloom and 15% once bloom occurs. If a combination of insects is present, the threshold for each pest should be reduced by 1/3.
Soybean cyst nematode can be seen on
plants that are 32-35 days from planting. The dry weather will accentuate the
damage from SCN. Look for areas in the field which are yellow and/or stunted.
The small yellow or white cysts can be seen easily at this time if you have a
10X hand lens and carefully dig up the plants and not pull them from the soil. If
you do not find the cysts, and/or to confirm their presence if you are not sure,
soil sampling is encouraged. Soil sample bags are available from the
The market for
Ending stocks for
The weather market is expected to extend over a longer period of time this summer and it is likely for us to see some better pricing opportunities yet to come for both corn and soybeans. For wheat, the short crops peak early syndrome should make wheat a good sell for the remaining '02 sales at harvest. Further price rallies can be used to price a portion of the new '03 crop.
Fifty years ago,
University of Delaware Cooperative Extension invites you to join your fellow farmers and other members of the agricultural community as our Extension Specialists lead discussions of this year’s field trials and other in-season issues related to corn, soybeans, and small grains. Other topics will include both grain marketing and farm bill highlights. We expect to have the 2001-2002 wheat and barley variety trial results for distribution and discussion. There will be time to discuss your current cropping issues.
Cooperative Extension Education in Agriculture and Home
Economics, University of Delaware, Delaware State University and the United
States Department of Agriculture cooperating, Robin Morgan, Dean and
in furtherance of the Acts of Congress of May 8 and