Mortality of sweetpotato weevil (Coleoptera: Apionidae) stages exposed to gamma irradiation
1995
Sharp, J.L.
Sweetpotato weevil, Clyas formicarius (F), eggs; first, second, and third instars; pupae; and adults in roots of sweet potato, Ipomoea batatas (L.) Lam., cultivar Jewel, were exposed to gamma irradiation doses ranging from 100 to 1,000 Gy. Criterion of effectiveness of the irradiation dose was based on preventing adults emerging from treated roots infested with different stages of the weevil. Dose -mortality data were analyzed by logistic, Gompertz, and normal probit probability density functions with and without log 10 conversions. Gompertz probability density function analysis gave the best 99.9968% mortality estimates (and 95% FL) against stages of sweetpotato weevil in roots: 37 Gy (35-42 Gy) for eggs (no log 10 conversion); 73 Gy (53-132 Gy) for first instars (log 10 conversion); 38 Gy (31-55 Gy) for second instars (log 10 conversion); 28 Gy (23-45 Gy) for third instars (no log 10 conversion); and 1,497 Gy (963-2.229 Gy) for pupae (log 10 conversion). Pupae irradiated with greater than or equal to 800 Gy produced no adults when efficacy tests were done. Irradiating adults in roots with 1,000 Gy did not prevent adult emergence. However, males exposed to 150 Gy were sterile, and females exposed to 300 Gy were sterile.
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