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Study on Regulatory Effect of Predatory Insects on Aphids in Agroforestry System

Author: YanFei
Tutor: LiKai
School: Beijing Forestry University
Course: Conservation and Utilization of Wild Fauna and Flora
Keywords: Harmonia axyridis Hedgerow Agroforestry systems Natural enemies of insects Natural enemies evaluation
CLC: S476.2
Type: Master's thesis
Year: 2011
Downloads: 47
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Abstract


This paper focuses on the large Sinon District agroforestry systems, the hedgerows - winter wheat fields as the research object, through the netting and visual method in the period from April 2009 to October 2010 from the crop growth period - Habitat - pests - natural enemies \The wheat aphid main predators in insects Propylaea japonica (Propylea japonica), Harmonia axyridis (Harmonia axyridis), the Seven Star ladybug (Coccinella is septempunctatd); Harmonia axyridis (H. axyridis) wheat fields and shrubs Lei Main Natural Enemies of Insects on the wall (sea buckthorn the hedgerow and Yang Shumeng bands); 3. wheat early growth stage (the regreening stage to heading preliminary), hedgerows the Harmonia axyridis main habitat, Harmonia axyridis bridge the transition from overwintering sites to farmland, the \habitat patches between mobile phenomenon in the early growth stage of wheat (the regreening stage to heading preliminary), the Harmonia axyridis tend to hedgerows late wheat growth (heading to the late ripening period) tends to the wheat fields, the wheat harvest after move into adjacent the hedgerows and early cornfield; 5. wheat aphids and ladybugs late wheat growth showed aggregated distribution ladybug on wheat aphids following effect on the level of spatial pattern, which makes the ladybug and wheat overlap thus facilitating the ladybug play control aphids on the aphid distribution pattern in time and space; 6. predacity insect control in wheat, but the the natural enemies performance evaluation shows ladybug role non-crop agroforestry systems; 7. habitats - hedgerows of natural enemies of insect: in the early stage of crop growth, when food is scarce, non-crop habitat for natural enemies to provide alternative food resources, habitat, spawning grounds, and maintain natural enemies in transition or bridge places, the species pool; farmland natural enemy communities established during the crop harvest, due to the dramatic changes in farmland landscape, non-crop habitat for its stable environment and thus as a natural enemy of the shelter, the important natural enemy communities in reconstruction of the succeeding crop fields sources.

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CLC: > Agricultural Sciences > Plant Protection > A variety of control methods > Biological control > The use of predatory insects
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