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Host Plants Choice and Use of the Natural Population and Host-Specialized Biotype of Aphis Gossypii in Nanjing

Author: ZhaoHaiYang
Tutor: LiuXiangDong
School: Nanjing Agricultural College
Course: Plant Protection
Keywords: Aphis gossypii Glover host specialization population dynamics Cucurbita zucchini L. host plant choose cotton-specialized aphid cucurbits-specializedaphid
CLC: S435.622.1
Type: Master's thesis
Year: 2013
Downloads: 5
Quote: 0
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Abstract


The cotton aphid Aphis gossypii Glover population in Nanjing has obvious host specialization, which can be definitely divided into two main types the cotton-specialized biotype and the cucurbits-specialized biotype. However, the ability of the cotton aphid population to choose and use host plants under the natural conditions, and the break of the host specialization under a multi-host plants system were unclear now. Therefore, the ability of the aphid of choosing and using host plants in a crop intercropping system planted cotton, cucumber, pumpkin and zucchini in spring, summer and autumn in Nanjing was studied, and the change of ability of the cotton-and cucurbits-specialized aphids to use host plants under the coexistence of cotton, cucumber and zucchini conditions was also studied. The following results have been attained.Under the condition of cotton, cucumber, zucchini and pumpkin uniform intercropping in Nanjing, the natural immigrated aphid population primarily chose cotton and zucchini in spring, but population grew rapidly only on the cotton, and it was very difficult to grow on the zucchini. A few cotton aphids in spring could choose the cucumber, but the number of aphids on the zucchini and pumpkin was very samll. In summer, the natural immigrated aphid population primarily chose the cucurbits crops, most on the zucchini, followed by the cucumber and pumpkin, and almost none on the cotton. Meanwhile the summer population was largest on the zucchini, followed by the pumpkin and cucumber, and very small on the cotton.There was a seasonal difference of the natural cotton aphids in the ability to choose and use host plants in Nanjing area, which may be associated with the host specialization existed in cotton aphid population.The results of the host use in laboratory experiments showed that under the coexistence condition of only cotton and cucumber host plants, the cotton-specialized aphids and the cucurbits-specialized aphids still could not change their host plants. The cotton-spcialized aphids could not use cucumber and build population on the cucumber plants, and the cucurbits-specialized aphids could not use cotton and build population on the cotton plants too.When the coexistence condition of cotton, cucumber and zucchini host plants in the laboratory experiments was supplied for cotton-and cucurbits-specialized aphids, both the cotton-and cucurbits-specialized aphids could survive and build population on their original host plants and the zucchini, and both the specialized aphids could transfer into the alternative host plant, cotton or cucumber when the original host and zucchini were malnourished or died. Moreover, the cotton-specialized aphids gained the ability to use cucumber host plant via the feeding experience on the zucchini plant, while the cucurbits-specialized aphids did not get the ability to use cotton host through the feeding experience on the zucchini. The host specialization of cotton aphid could be broken by the feeding experience on the special intermediate host.

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Crop pests and diseases and their prevention > Economic crop pests and diseases > Fiber crop pests and diseases > Cotton pests and diseases > Insect pest > Cotton aphid
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