Abstract: In order to confirm the genetic background of the population differentiation in light capacity of cotton aphid, Aphis gossypii Glover, the selective tests for the taking-off behavior, sexual aphid inducement, and hybridized inheritance of taking-off characteristics were studied. The results showed that the selected response of the taking-off angle and taking-off rate were strong, and the migratory strain (M) with large taking-off angle and the sedentary strain (S) with high non-taking-off rate were screened through four and two successive selections, respectively. The conditions of sexuales producing, mating and egg hatching in the laboratory were found. The taking-off performances of the migratory strain (M), sedentary strain (S), hybridized offsprings of M and S (M♀×S♂, S♀×M♂), and the aphids stayed on the summer hibiscus tree (H) were compared. The results showed that the taking-off rates of the M, M♀×S♂ and S♀×M♂ were significantly higher than that of the S strain, and the taking-off angle of the M♀×S♂ was significantly larger than that of the S strain and the H aphids. The alate rate produced by the S was lower than those produced by the M, M♀×S♂ and S♀×M♂. These results indicated that the inheritance effect of the taking-off performance was strong. The time waiting for taking-off of M♀×S♂ was significant shorter than that of the M♂×S♀ offspring and H aphids, but there was no difference between the M strain and the S strain, indicating that the inheritance effect of the time waiting for taking-off was very weak.

Key words: Aphis gossypii, sexual generation, taking-off angle, taking-off rate, selected response, hybridized inheritance