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P.O. Box 318 |
Hillsboro,
TX 76645
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July 11, 2002 Vol. VIII No. 10 |
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GENERAL SITUATION The moisture situation will range from adequate to wet. Most of the area has good moisture. Most of the corn silage has been silaged. The Aquilla area is starting to cut milo. Cotton continues to load and appears to have good yield potential. Most of the cotton has some full grown bolls. CORN and GRAIN SORGHUM Grasshoppers continue to move into area milo fields. Producers who are planning on spraying corn or milo for grasshoppers should pay close attention to the number of days to harvest for the material they are using. Sorghum headworms will range from 0-4 per 100 heads. The economic threshold is an average of 2 per head. COTTON Cotton aphids will range from very light to moderate. I have seen a couple of fields where aphids are at moderate levels with honeydew on the leaves and a small amount of leaf cupping. |
I would expect that we would start to see more aphids next week. With the moisture situation, this is not a concern at this point. Grasshoppers continue to be a problem in some area cotton fields. There have been a few fields where border treatments have been applied. Spraying the edge of cotton fields for grasshoppers is risky and may lead to a bollworm problem-upsetting the balance of beneficial insects. Cotton continues to put on new leaves and this has helped in reducing grasshopper damage. Boll weevil percent punctured squares will range from 0-1 per 100 plants. In most fields we are not seeing any punctured squares. We continue to see a few traps with light weevil numbers. With the very light numbers of punctured squares, I would not expect to see a significant amount of punctured squares until the first or second week of August. Chatt, Barney Pustejovsky-1; Chatt, Joe Sinkule-1; Bynum, Leroy Walters-2, Brandon, Larry Degner-2; Malone, Kenneth Machac-2 and West, John C Polansky-1. Bollworm egg counts over the last few days will range from 4-20 per 100 plants. Bollworm larvae over the past week will range from 0-44 per 100 plants. |
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Currently, many area fields are being sprayed for bollworms. I would guess that we will end up spraying at least the majority of the cotton in the area. Peak bollworm egglay occurred sometime between July 3 and July 7, depending on location. We did not see a definite peak but more of an extended egglay. We are seeing a reduction in bollworm egglay, in most fields, with counts ranging from 4-16 per 100 plants. I would expect that one application for bollworms will be sufficient. Producers should monitor their fields closely for bollworm larvae if a treatment has not been applied. I have not seen any problem with bollworms in Bt cotton. Larvae counts will range from 0-4 per 100 plants. You may see an occasional large worm but in most cases the larvae are 1-2 days old. In Bt cotton the larvae will feed on leaves and squares and it may take a day or two before they die. Lygus bugs will range from 0-8 per 100 plants. Most fields will range from 0-6 per 100 plants. We continue to see a little more Lygus activity. Most of the Lygus are small nymphs. Damage from Lygus has been minimal and currently they are not a problem. This is an insect we will need to watch closely over the next two to three weeks. Spider mites are not being seen in cotton. Beet armyworm moth trap counts are light. Larvae are not being seen in the field. BEET ARMYWORM TRAP COUNT
(The cumulative average of two traps/week. Trap locations are in the Chatt and Vaughan area) |
*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.
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