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P.O. Box 318 |
Hillsboro,
TX 76645
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May
31, 2001 Vol. VI No. 6 Hill-McLennan Counties Web Site: entowww.tamu.edu E-mail: m-jungman@tamu.edu |
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GENERAL SITUATION The soil moisture conditions will range from less than adequate to wet. Rainfall was recorded in most locations on May 31 with totals ranging from 1/4-3/4 inch. A large portion of the county is in need of more rain. A number of corn fields have started to tassel throughout the area. The earliest planted grain sorghum is beginning to head. Cotton growth stage will range from cotyledon to first 1/3 grown square. The majority of the cotton will range from pinhead to match-head square. CORN and GRAIN SORGHUM Greenbug levels are light in grain sorghum. Yellow sugarcane aphids have been seen in very light numbers in a few area fields. Corn leaf aphids are in light to moderate numbers in the whorls of milo. This aphid is not considered an economic problem. Grasshoppers are in high numbers in area pastures. Producers should start to monitor crops next to pastures or grassy areas. We are seeing movement of grasshoppers from pastures into the edges of crop land. |
*********************************************** Producers that are planning or considering silaging corn should be very careful on what foliar insecticides they use for grasshoppers, etc. and the number of days to harvest. *********************************************** COTTON Cotton continues to make good progress. Percent square set will range from 50-75%. Thrips numbers and damage will vary from light to heavy. We are seeing more damage from thrips in the smaller cotton. Cotton aphids, in general, are light. This insect will increase as farmers apply 1-2 insecticide applications for fleahoppers and overwintered weevils. I am not expecting much of a problem with aphids during the early season. Beneficial insects are moving into fields in sufficient numbers after insecticide residual has diminished. Fleahopper numbers will range from 3-100 per 100 terminals. Most fields will range from 18-50 per 100 terminals. |
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Fleahoppers are the insect of most concern in cotton at this point. Producers will need to apply 2 insecticide applications 5-7 days apart to control this pest. The economic threshold level is 15-25 per 100 terminals. Treatment should begin at 15 fleahoppers per 100 terminals. Lygus bug numbers will range from 0-4 per 100 plants. Overwintered boll weevil trap counts continue to be very light. In spite of these light numbers, I would urge all producers to apply 1-2 overwintered boll weevil applications for this pest. Producers, if possible, should discontinue insecticide use on June 8th and start to build up beneficial insects. I realize the later planted cotton will probably need insecticide treatment(s) after this date. OVERWINTERING
BOLL WEEVIL
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Beet
armyworms trap counts are light. We are not seeing beet armyworm larvae
in cotton fields.
BEET ARMYWORM TRAP COUNT
(The cumulative average of two traps/week. Trap location is in the Chatt area.)
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