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P.O. Box 318 |
Hillsboro,
TX 76645
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May
2, 2001 Vol. VIII No. 1 Hill-McLennan Counties Web Site: entowww.tamu.edu E-mail: m-jungman@tamu.edu |
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GENERAL SITUATION Corn and grain sorghum continues to grow-off well. In general, moisture conditions are adequate. Grain crops on lighter land or next to tree lines indicated moisture stress when temperatures were in the 90 degree range. Hot, windy conditions have also caused leaves to roll up in corn and grain sorghum where moisture is adequate. Corn will need a rain in the near future. Corn will range in size from 12-30 inches and grain sorghum will vary from 6-18 inches. Most of the cotton is up to a stand. Warm soil temperatures caused cotton to be up to a stand 4-5 days after planting. Cotton growth stage will range from cotyledon to 2 true leaves. WHEAT Fall and true armyworms are below threshold levels in all fields in the IPM Scouting Program. Counts will range from 0-1.8 per square foot. Most fields will average 1 or less. Economic threshold is an average of close to 3 per square foot. With the lower numbers and the wheat drying down rapidly, I do not expect a problem with this pest unless it's an isolated situation |
GRAIN SORGHUM and CORN White grub problems are being seen in some scattered corn fields. Generally, what you will see is areas where stands have been thinned due to grub feeding. If you dig down in the soil, 3-4 inches below a damaged plant, you will find the grub. Fields with damage have been seen over the past two to three weeks. Damage is characterized by severe root pruning and dying off of plants. There is no control for this pest at this stage. ******************************************* Chinch bugs have been seen in high numbers in some area fields. Damage would include stunting of the plants, reddening at the base of the plant and root pruning. |
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Greenbugs are being seen in light numbers in grain sorghum. Cornleaf aphids in grain sorghum will range from not visible in whorl to moderate numbers. This aphid is normally not considered a pest in milo and will attract beneficial insects. (Under severe drought conditions with high numbers we have seen one year where leaf reddening and partial dying of leaves was a problem-this is an unusual situation. That particular year we received rainfall and numbers were drastically reduced before any treatments were applied.) Grasshoppers are being seen in pastures in high numbers. They are approximately 1/4 inch or less in length. At this stage it is difficult to tell how numbers correspond to previous years. Producers should start to monitor crops located next to grassy areas-road sides, waterways, pastures, etc. COTTON Thrips are being seen in light to moderate numbers on cotton planted without a soil insecticide or a systemic insecticide seed treatment. These fields will need to be treated with a foliar insecticide within the next few days. Thrips numbers will continue to increase as the wheat and weeds in pastures dry down. Cotton planted with Orthene® as a seed treatment will probably need to be treated for thrips in one week or less. Timek®, Thimet® and Cruiser® should last for a longer period of time. Control from these materials looks good at this point. Last year, thrips numbers were light. I am expecting more problems with thrips this season. Aphids are in light numbers in cotton. Boll
weevil traps are being set out this week and we will start monitoring
them next week.
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