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Your Position :Home->Past Journals Catalog->2012年49 No.4

Influence of wheat harvesting on populations of the main natural enemies of cotton pests in northern Xinjiang
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Key Words:intensive cotton belt,wheat harvest,natural enemy,sink-source relationship
Abstract:This study was carried out during the mature and harvesting stage of wheat in an intensive cotton belt in
northern Xinjiang in 2009. The sweeping method was used to collect insects from wheat and cotton fields after which the
abundance of insects was recorded and analyzed. The abundance of natural enemies continuously declined as wheat
matured and only a few survived in wheat fields after all wheat plants had been harvested. Conversely,numbers of natural
enemies increased rapidly in adjacent cotton fields after wheat harvest (59. 23 individuals per 100 sweeps),which was
higher than in control fields ( 15. 33 individuals per 100 sweeps) . A significant positive correlation between the wheat
harvest ratio and the abundance of natural enemies in adjacent cotton fields was found but there were no significant
seasonal trends in the abundance of 4 main groups of these ( Ichneumonidae, Coccinellidae, Syrphidae, and
Chrysopidae) . Natural enemies of cotton pests that live in wheat fields may be forced to move to adjacent cotton fields
when wheat is harvested. Further research on the sink-source relationship of natural enemies in the intensive cotton belt is
important to improve the future sustainability of agriculture in this region.
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