Anastrepha ludens (Loew) (Diptera: Tephritidae) larvae irradiated at higher doses improve the rearing of two species of native parasitoids

JORGE CANCINO,; AMANDA AYALA; OVRUSKI, SERGIO; LAURA RIOS; PATRICIA LOPEZ; JORGE HENDRICHS

JOURNAL OF APPLIED ENTOMOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2020 vol. 144 p. 866 - 876

0931-2048

Irradiation doses 40, 80, 120 and 160 Gy were used on 6, 7, 8 and 9-d-old Anastrepha ludens Loew (Diptera: Tephritidae) larvae. The larvae from the different age groups irradiated with different doses were exposed separately to Doryctobracon crawfordi, Utetes anastrephae and Diachasmimorpha longicaudata parasitoids. A significant increment in parasitoid emergence directly related with radiation increment on parasitoids D. crawfordi and U. anastrephae was observed. This effect was higher on irradiated young larvae; in D. longicaudata, emergence increment was related with age of larva but no with radiation doses. Similar results were obtained for sex ratio. Larva weight increased with age and irradiation had no effect on gaining weight of growing larvae. The larval mortality 72 h after exposition had an inverse relationship regarding age, though it did not have a negative effect as regards radiation doses. Immature stages of parasitoid/larva (>1 = superparasitism) was higher in 8-d-old larvae parasitized by D. longicaudata; radiation dose increment did not affect superparasitism. In D. crawfordi and U. anastrephae super-parasitism was absent (