An example of host plant expansion of host-specialized Aphis gossypii Glover in the fieldReport as inadecuate




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The host plant expansion of host-specialized Aphis gossypii Glover has been well studied in the laboratory; however, this phenomenon is poorly understood in the field. Here, we provide a series of laboratory and field experiments to assess the role of zucchini in the host plant expansion of cotton-specialized aphids. We observed that cotton-specialized aphids possessed the ability to expand on a new host plant cucumber, with individuals first recorded on June 12 and consequently increasing exponentially in number in a field cage. A bioassay experiment showed that aphids from both cotton and cucumber preferred their natal host, but clones from zucchini have a stronger preference for cucumber than cotton or zucchini. A total of 1512 individuals were collected from a cotton field mixed cotton and cucurbit plot, cotton farmland cotton alone and a field cage and sequenced to identify their biotypes. The results for apterous individuals from the cotton field showed that more cucurbit-specialized biotypes occurred on cucumber and more cotton-specialized biotypes occurred on cotton and zucchini. A majority > 97.0% of aphids from both the field cage and cotton farmland were cotton-specialized individuals. Consequently, eliminating intermediate host plants may be an effective measure to suppress A. gossypii outbreaks, because cotton and cucumber are often grown together in fields and greenhouses.



Author: Dao-Wu Hu, Shuai Zhang, Jun-Yu Luo, Li-Min Lü, Jin-Jie Cui , Xiao Zhang

Source: http://plos.srce.hr/



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