Volume
10, Issue 16
July 12, 2002
Volume
10, Issue 16
July 12, 2002
Vegetables
Vegetable Insects
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Cucumbers.
Continue to scout for aphids. A treatment should be applied for aphids if 10 to 20 percent of the plants are infested with aphids.
Lima
Beans.
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.
Peppers.
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.
Snap
Beans.
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.
Sweet
Corn.
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; kee@udel.edu
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, wootten@udel.edu
The Laurel Auction Market officially opened on
http://auctiondata.delmarvaproduce.com/dailypricereport.cfm
or by phone at (302) 875-3358.
From the
Latest EFI values
from local weather stations
Any questions please call (410) 742-8788
EFI Values (Environmental Favorability Index)
Do not use MELCAST
if there is a disease outbreak in your field, it is a preventative program.
Location