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Effects of soil temperatures and chilling on flight and mortality of sterile boll weevils anthonomus grandis



Effects of soil temperatures and chilling on flight and mortality of sterile boll weevils anthonomus grandis



Journal of the Georgia Entomological Society 16(2): 254-257



Weevils fed 100 ppm of diflubenzuron diet for 6 days + 10 Krads of acute irradiation were released (chilled or unchilled) on clay soil surfaces heated as high as 75.degree. C or on sand surfaces heated as high as 52.degree. C. In these laboratory tests (simulating weevil releases from a chilled dispenser in an airplane into a hot cotton field) only 2% of the weevils survived for 2 min at temperatures of 60.degree. C or more. At 49.degree. C or higher, survival on sand surfaces was < 15%. A sandy surface reduced flight to about 1/2 that of a clay soil surface when weevils were released at 30-33.degree. C. Chilling weevils prior to testing and/or increasing soil temperatures reduced flight considerably.

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Accession: 005326059

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