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P.O. Box 318 |
Hillsboro,
TX 76645
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June 13, 2002 Vol. VIII No. 7 |
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GENERAL SITUATION The moisture situation will range from dry to adequate. Corn is in need of rainfall. The majority of the corn is close to roasting ear stage. Grain sorghum continues to make rapid progress. The majority of the grain sorghum is at bloom or in seed. Cotton will range from pinhead square to bloom. Most of the cotton is at 1/3 grown square. CORN and GRAIN SORGHUM Grasshoppers continue to move into some area fields next to pastures, waterways, roadsides, etc. In some locations grasshoppers have moved in further than just the edge of the field. Producers should monitor corn and grain sorghum for grasshoppers. Producers that are planning or considering silaging corn should be very careful with the insecticide they will use and the number of days to harvest. Lorsban ® should not be applied 14 days prior to harvest of silage. |
Greenbugs that were in moderate to high levels a week to 10 days ago have been reduced to light numbers. Beneficial insects have reduced greenbug numbers. Yellow sugarcane aphids are light in grain sorghum. Sorghum midge will range from 0-12 per 100 heads. The economic threshold is an average of 1 per head. Spider mites are being seen in corn along the perimeter of a few area fields. COTTON Cotton has grown off well over the past 10 days and is putting on an adequate number of squares. In general, percent square set will range from 50-80%. The majority of the cotton will have a square set of 60-75%. Most fields are past fleahopper problems. Thrips are a problem in younger, less advanced cotton. |
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Cotton aphids are light across the area. I have not seen any fields with moderate numbers. Grasshoppers continue to move into some area cotton fields. Producers should be very careful when treating for grasshoppers as not to create a bollworm problem. I would be somewhat reluctant to treat the edges of non Bt cotton for grasshoppers due to my concern for bollworms. There are probably some exceptions where grasshopper migration levels are too severe. Fleahopper numbers will range from 0-12 per 100 terminals. Overwintered boll weevil percent punctured squares are below detectable levels. Trap counts are very light. Bollworm eggs will range from 0-8 per 100 plants. Bollworm larvae will range from 0-7 per 100 plants. We are seeing an increase in bollworm eggs and larvae. It is not unusual to pick up 3-4 bollworm larvae per 100 plants in some area fields. One field in the Penelope area had 7% larvae. Beneficials are starting to build with an increase in pirate bugs and lacewing larvae. There appears to be more lacewing eggs at this stage than normal. Spider mites are in very light numbers in a few area fields. Beet armyworm larvae are not being seen in area fields. Beet armyworm moth trap counts are light. BEET ARMYWORM TRAP COUNT
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Trap was down at Chatt location counts include just Vaughan trap. (The
cumulative average of two traps/week. Trap locations are in the Chatt
and Vaughan area) |
Bollworm/Budworm Moth Trap Catches
(Number of moths per trap) * Bollworm and budworm moth trap counts are not indicative of the number of moths out in the field. The trap counts are used as a monitoring tool to determine the percent bollworm and percent budworm in the area. OVERWINTERING
BOLL WEEVIL
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