Latest Issue of Cotton Comments Includes Growing Degree Days, Moth Catches, and Current Conditions for the StateWed, 05 Aug 2020 14:12:47 CDT
The latest issue of Cotton Comments covers several important topics this month including Cotton Progress, Sesame, Growing Degree Days, Oklahoma State University Field Surveys, Moth catches, and Oklahoma Boll Weevil Eradication Organization.
When it comes to the current situation of the cotton crop, The crop where moisture is adequate or abundant excellent growth is occurring, where moisture is limited or poor the crop is suffering with several fields already “bloomed at the top”. If rain occurs within this week and adequate moisture continues for the rest of season these fields may recover however the rain must occur soon.
Cotton bollworms are being reported in several fields where the varieties containing the Bt 2 gene is being grown. These fields are located in areas where corn is produced. I feel these are local moths that infested these fields because of low moth counts in another areas of the state and the weather pattern prohibiting moth movements from Texas.
This would explain why certain areas are experienced higher moth activity. Please refer to Cotton Comments Volume 10 edition 8 July 9, 2020 for further information about this pest. Also stink bugs are being reported in fields adjacent to corn fields.
Some suggestions for scouting irrigated and lush dryland fields that contain the Bt 2 gene.
1) Scout twice a week until first week of September then continue once a week.
2) Do whole plant inspections, moths tend to lay lower in the plant this time of year.
3) Start monitoring eggs counts so timing of the next hatch can be anticipated. a. White eggs will hatch in 5 days b. Brown eggs will hatch in 3 days The higher rates of Prevathon is also suggested.
This comes from the experiences from the 2018 crop year when this infestation occurred. Cotton aphids are also being reported but beneficial insects were holding the numbers down and no control sprays are needed as of yet.
Please contact your local county extension office or this office for any questions. After emergence scouting of the field must start and continue on a weekly basis until termination of the crop.
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