Abstract: The fluctuation dynamics, diffusion and migration of Aphis gossypii population on Hibiscus syriacus and cotton plants were studied. The distribution of Aphis gossypii on Hibiscus syriacus plants from April 20 to May 6 was aggregate with the bigger density in the eastward, and most in No. 4 and No. 10 plants. After May 6, the distribution changed due to diffusion. The number of Chrysopa septem punctata was related to that of Aphis gossypii, while the relationship between the total number of all the natural enemies and the number of Aphis gossypii was extremely significant. The influence order of natural enemies on Aphis gossypii was Propylaca japonica > Tromobididiidae > Chrysopa septem punctata. The growth model for Aphis gossypii population on Hibiscus syriacus from April 18 to May 16 was linear. The relative humidity of the day before was significantly related to the winged adult rate. The rate of winged adult aphids in cotton field was extremely significantly related to that on Hibiscus syriacus two days before.

Key words: Aphis gossypii, Diffusion, Migration, Grey relational analysis, seed dispersal quantity, natural disturbance, human disturbance, seed dispersal distance, seedling regeneration