Northwest
Plains
Pest Management News
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| Volume 1 Issue 9 |
Bailey
and Parmer Counties
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August
9, 2002
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Northwest
Plains
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Current Crop Conditions Most cotton has cutout (NAWF equals 5). Fruit shed continues to be a concern as the cotton plant adjusts it's load to current conditions. When accumulated heat units from the day of cutout reaches 450, bolls are relatively safe from pests. The starch line has started moving down the kernel in some corn. This is the line that is visible when you break the ear in half and view the kernel from the side. When this line is half way down the kernel and the soil moisture is at field capacity irrigation can be terminated. If the starch line is half way down but the soil profile is not full additional irrigation will be needed to fully develop the grain. A few corn fields continue to warrant treatment for spider mites, fall armyworms, and southwestern corn borers. Daily Water Requirements
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Bollworms / Headworms
Bollworms Regular
whole plant counts of bollworms are necessaryto accurately |
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Headworms Because
many young headworm larvae die naturally, Beet Armyworms Beet armyworms are increasing in numbers in Lubbock, Hale and Hockley Counties. Occasional BAW are being found in crops in Bailey and Parmer Counties. Aphids Aphids are building in cotton. They are moving out of squares and terminals to the undersides of leaves. It is not uncommon to find 5-8 aphids per leaf. This number is far from threshold but should be monitored closely especially after a bollworm insecticide treatment. Lacewings Large numbers of lacewings, lacewing larvae, and lacewingeggs are present in the fields currently. If these numbers can be preserved it will go a long way toward control of the aphid population. |
Monti Vandiver |
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| Educational programs
conducted by Texas Cooperative Extension serve people of all ages regardless
of socioeconomic level, race, color, sex, religion, handicap or national
origin. The information given herein is for educational purposes only.
References to commercial products or trade names is made with the understanding
that no discrimination is intended and no endorsement by Texas Cooperative
Extension is implied.
The Texas A&M University System, U.S. Department of Agriculture,
and the Commissioners Courts of Texas Cooperating
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The
corn earworm is changing its name. Heavy egg lay has started in crops
other than corn. The egg lay started Wednesday night and has continued
to present. 30,000 to 120,000 eggs per acre have been found in area cotton.
The heaviest infestation is in taller more lush cotton.
determine the population density. Treatment may be justified when counts
average 5,000 or more small worms per acre. However, if two or more key
predators are found for each small worm, control measures may not be needed
or a microbial insecticide may be used.
do
not apply insecticide until they are at least ½ inch long.The
economic injury level is about 1 to 2 larvae per grain head of commercial
sorghum. Fewer larvae per grain head may justify treatment on sorghum
grown for seed because of the higher per-acre value. Inspect at least
30 grain heads from a field to ensure reasonable reliability of sample
size.
be
preserved it will go a long way toward control of the aphid population.
