VegNet Vol.
12, No. 12.
On the WEB at: http://vegnet.osu.edu
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fax, Call 614-292-3857
In This Issue
1. Fungicide Programs for Cucurbit
Disease
2. Crop Reports
3. Pesticide Container Recycling Sites Announced
Fungicide
Programs for Cucurbit Diseases - Sally Miller
In a dry year such as this (so
far), diseases can be expected to be less evident than in rainy years.
Therefore, it may not be necessary to start fungicide applications until later
in the season than in the last several years. A good scouting program,
combined with attention to the weather forecasts, is important to determine
when to start applying fungicides. A fungicide
program for vine crops might start with broad-spectrum protectants
such as Bravo, mancozeb or maneb
to control diseases such as anthracnose, alternaria
leaf spot and gummy stem blight. A copper-containing product such as Kocide 2000 should be included to reduce populations of angular leaf spot bacteria and
will also help with the fungal diseases. Once powdery mildew
shows up, a good powdery mildew product should be included such as Amistar, Procure or others. If downy mildew comes
in, probably not before mid-late August, then the weekly program should include
a fungicide such as Tanos/Manzate, Previcur Flex + Bravo, or Gavel + Bravo alternated with Ridomil Gold Bravo or other fungicide with a different mode
of action (different Fungicide Group).
Continue adding copper for angular leaf spot management. See pages 56-57
in the 2005 Ohio Vegetable Production Guide (OSU Extension Bulletin 672) for
information on fungicide resistance management and a listing
of vegetable fungicides and the Fungicide Group to which they belong.
The second case of downy
mildew on cucumber in
If it looks like there is going
to be sustained rainy weather, especially if there are going to be
thunderstorms with significant rainfall, and the cucumber, squash, or other
vine crop field has a history of Phytophthora
blight, fungicides for Phytophthora
management need to be included (this needs to be done preventatively).
Acrobat, Gavel or Tanos, tank-mixed with the full
rate of Kocide 2000 or other copper hydroxide
fungicide can be used. These have to be alternated with each other or a protectant fungicide; the Tanos
label also requires that Manzate or similar product
is included. It is important to protect cucumber fruit while they are forming,
so that is the best time to use the fungicides like Acrobat, Gavel or Tanos. However, the Pre-Harvest Interval for Gavel (5
days) and Tanos (3 days) can be a problem.
Fungicides should only be considered as a last resort in vine crop
disease management. Crop rotation, clean seed,
resistant varieties, water management and other cultural practices
should be initiated to prevent the buildup of pathogens and reduce the chances
for serious disease problems.
Crop
Reports
Drought like conditions continue as the
irrigation pumps are being used almost 24 hours a day to bring water to
growers' fields. Thank goodness for trickle irrigation in tomatoes,
peppers, eggplant, and vine crops. Overhead irrigation mainly used for
sweet corn production. Chance of scattered rain on
Wednesday, June 29th.
Warm nights and hot days are assisting the crops in growing,
especially tomatoes and vine crops. Sweet corn will be in tight
supply for the July 4th weekend and tomatoes almost non existent. By the
10th both should be available.
Another 12 corn earworms moths caught in helio
traps this past week, June 21-28. No
European corn borer moths trapped, however some signs of tassels bending were
noticed by growers.
Hot and dry continues to be the weather pattern in eastern
Heat and dry is the talk of the towns. Some areas did get up to 6
inches of rain this week whereas 1/2 mile down the road growers got 1/10 in.
Irrigation continues with growers reporting ponds running low and dry and some
reverting to having wells dug.
Harvest of high tunnel tomatoes is in full swing with very high yields and
quality prices are up to $2 a pound wholesale. Harvest of all summer squash and
cukes is in full swing with much crop coming in.Sweet corn harvest has begun with yields not as high but
quality is good. Harvest of green beans has begun. Planting of pumpkins,
squash, sweet corn, melons, tomatoes, cabbage, beans, lima beans, cucumbers and
squash continues. New potatoes are being dug.
Cucumber beetles are being reported by growers as being very bad with growers
making insecticide applications.
Early blight is showing up on tomatoes and potatoes.
PESTICIDE
CONTAINER RECYCLING SITES ANNOUNCED From PEP-TALK, July 2005
Tri-Rinse will be picking up containers at 23 locations in