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Development, survivorship, and reproduction of Aphis gossypii (Hom.: Aphididae) parasitized by Aphelinus (s. str.) gossypii (Hym.: Aphelinidae)


Development, survivorship, and reproduction of Aphis gossypii (Hom.: Aphididae) parasitized by Aphelinus (s. str.) gossypii (Hym.: Aphelinidae)



Plant Protection Bulletin Taipei 43(1): 39-46



This experiment studies the survivorship, development and reproduction of cotton aphids parasitized at various stages by Aphelinus (s. str.) gossypii at 25[degree]C. The development and reproduction of cotton aphid reduced greatly on the 3rd days after the start of parasitization, and these processes were completely retarded by parasitism thereafter. The average survival times of aphids after parasitized at all stages were almost same for 5 days whereas the unparasitized aphids lived on for 34.5[plus or minus]4.3 days. Aphids parasitized at 1st and 2nd instar died before producing any offspring. About 30% of aphids parasitized at 3rd instar, 50% of aphids parasitized at 4th instar, and 100% of aphids parasitized at early adult produced only fewer offspring during a shorter reproductive period compared to that of the unparasitized aphids. These data indicated that the host stage at parasitization is crucial in determining the development and reproduction of the parasitized aphids.

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