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Texas
Agricultural Extension Service The Texas A&M University System |
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| Jones | Mitchell |
Nolan
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Scurry
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| Stephen
Biles Extension Agent - IPM P.O. Box 558 Sweetwater, TX 79556 |
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Office:
(915) 236-9011
Fax: (915) 236-9018 e-mail: biles-sp@tamu.edu Website: http://nolan-ext.tamu.edu/ipm |
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| Vol. 4, No. 14 |
THE
INTEGRATED PEST MANAGEMENT NEWSLETTER
FOR THE LOWER ROLLING PLAINS |
August
20, 2002
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GROWING CONDITIONS Cotton fields are continuing to mature at a normal rate. Many fields have already achieved cutout, with fewer than 4 nodes above white flower. However, there are still some fields that have not achieved cutout and are continuing to add fruit to the plants. Fields planted in May should have open bolls. COTTON INSECTS Aphid numbers have been erratic with most fields maintaining low populations of aphids and a few fields producing damaging levels of up to 100 aphids per leaf. Bollworm eggs are being found up to 54 per 100 plants or about 25,000 per acre. Fields that I have looked at over the past week have had less than 10 small worms per 100 plants (4500 per acre). I have heard of some fields exceeding thresholds and requiring insecticide treatment. The populations of worms may increase drastically in the coming days, especially in irrigated fields and fields that are more lush. Bollworm moth activity has increased over the past week with moth counts increasing from 76 bollworm moths to 256 moths per week in the Snyder area. The Mitchell County traps increased from 16 to 49 bollworm moths. My Nolan and Jones county traps are not active due to grasshoppers. But I would not expect to see great differences in these areas. |
Tobacco
budworm moths are also increasing in Scurry County from 13 moths last
week to 45 moths this week. This indicates that a greater number of
tobacco budworm moths are in the area and may be laying eggs. Thus,
if you need to treat for worms, you may want to consider an alternative
to pyrethroids as they will be less effective at controlling tobacco
budworms. The Mitchell County traps had no increase in tobacco budworm
moth trap captures.
SAFE COTTON BOLLS A cotton boll is safe from bollworm attack at 350-450 heat units (HU) after bloom. Bolls that bloomed before August 2 have received more than 400 heat units and should not be affected by bollworms. Producer
Turn-Row Meetings
Please Note the Change in the Normal Schedule for Tuesday and Wednesday. |
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Educational programs conducted by the Texas Agricultural Extension Service 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 the Cooperative Extension Service is implied. We will seek to provice reasonable accomodations for all persons with disabilites for all extension programs. We request that you contact Mr. Stephen Biles (915/236-9011) as soon as possible to advise us of the auxiliary aid or service that your require. ___________________________________________________________________________________________________________
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Table 5. Projected Dates of Crop Growth Landmarks for Various Planting Dates Based on Table 4
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