3 years ago

An example of host plant expansion of host-specialized <i>Aphis gossypii</i> Glover in the field

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

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

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.

Publisher URL: http://journals.plos.org/plosone/article

DOI: 10.1371/journal.pone.0177981

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