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Synthetic ecdysteroids plus acute irradiation method for sterilizing the boll weevil anthonomus grandis coleoptera curculionidae



Synthetic ecdysteroids plus acute irradiation method for sterilizing the boll weevil anthonomus grandis coleoptera curculionidae



Journal of Economic Entomology 76(1): 63-68



Four synthetic ecdysteroids and diflubenzuron were assessed in combination with .gamma.-irradiation for inhibitory effects on reproduction in A. grandis Boheman. Two of the compounds, 3.beta., 5.beta., 14.alpha.-trihydroxy-5.beta.-cholest-7-en-6-one (III) and 2.beta.,3.beta.,14.alpha.-trihydroxy-5.beta.-cholest-7-en-6-one 2-acetate (II), were equally active and were the most inhibitive of the ecdysteroids tested. Treated males crossed with untreated females were 99.5% sterile. Egg production by treated females was reduced to < 0.1 egg/female, and few of these developed into adults. The mating ability of ecdysteroid-.gamma. irradiation treated males was more than twice that of males treated with diflubenzuron-.gamma. irradiation. Unlike diflubenzuron, neither ecdysteroid seemed to increase the detrimental effects caused by irradiation. The feeding of weevils with diet containing ecdysteroid III followed by irradiation affords an effective method for sterilizing the boll weevil for field release.

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Accession: 006572871

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