Volume
10, Issue 12
June 14, 2002
Volume
10, Issue 12
June 14, 2002
Vegetables
Vegetable Insects
-
Peppers.
In areas where corn borer trap catches are above 2 per night and pepper fruit is ½ inch in size or larger, fields should be sprayed on a 7-10 day schedule for corn borer control. If Orthene or Address are used, it will also control pepper maggot. If Lannate, Spintor or a pyrethroid are used, then dimethoate should be added to the mix. Be sure to check the IPM website for the most recent BLT catches in your area (http://www.udel.edu/IPM/traps/latestblt.html ).
Potatoes.
We have started to find our first green peach aphids in fields where Admire, Platinum or Tops MZ Gaucho were not used at planting. If a field is greater than two weeks from harvest, the threshold is 4 aphids per leaf. Within 2 weeks of harvest, the treatment threshold increases to 10 aphids per leaf. Actara, Fulfill or Provado will provide control.
Snap
Beans.
Once corn borer catches reach 2 per night, fresh market and processing snap beans in the bud to pin stages should be sprayed for corn borer. Orthene or Address should be used at the bud and pin stages on processing beans. Once pins are present on fresh market snap beans and trap catches are above 2 per night, a 7-10 day schedule should be maintained for corn borer. Lannate, Asana, Capture or Mustang are labeled. Orthene has a 14-day wait until harvest.
Sweet
Corn.
In most areas of the state, fresh market silking
sweet corn should be sprayed on a 5-6 day schedule except in the Harrington and
Hollow Heart of Watermelon - Ed Kee, Extension Vegetable Crops Specialist; kee@udel.edu
The incidence of hollow heart in the crown fruit of commercial seedless watermelon plantings has varied over the years. It can be described as the separation of inner parts of the fruit into distinct segments, leaving hollow areas at harvest maturity. The crown fruit is the first set, and often experiences a rapid growth rate, when the rind is expanding more rapidly than the inner regions of the fruit. Causes for hollow heart may include excess nitrogen, delayed harvest, and perhaps, the tendency of some varieties to exhibit more hollow heart than others. Hot weather during the ripening period of the crown fruit can also accentuate the problem.
Growers are encouraged to manage their nitrogen applications, and not apply any within two weeks of harvest. Nitrogen applications can be made after the first harvest to support later setting fruit. The total amount of nitrogen applied to seedless watermelons does not need to exceed 125 lbs./acre.
Vegetable Diseases -
Kate Everts, Extension Vegetable Pathologist,
University of
Watermelons.
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
Charles Co. 0 0 0 0 0 8 3
Collins Farms 0 2 1 0 0 4 0
Vincent Farms 0 2 0 0 0 3 0
White Marsh 0 0 0 0 0 6 4
The first fungicide
spray should be applied when the watermelon vines meet within the row. Additional sprays
should be applied using
MELCAST. Accumulate EFI (environmental
favorability index) values beginning the
day after your first
fungicide spray. Apply a fungicide spray
when 30 EFI values have accumulated by the
weather station nearest your
fields. Add 2 points for
every overhead irrigation. After
a fungicide spray, reset
your counter to 0 and start
over. If a spray has not been applied in 14 days, apply
a fungicide and reset the
counter to 0 and start
over. The first and last day listed
above can be partial days so use the larger EFI value
of this report and other
reports for any specific day.
If, for some reason, a
serious disease outbreak occurs in your field, return to a weekly spray
schedule
More detailed information
concerning MELCAST and sample data sheets are available on the web at http://www.agnr.umd.edu/users/vegdisease/vegdisease.htm.