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Strip cropping of wheat (Triticum aestivum) and alfalfa (Medicago sativa) as a mechanism for improving the effectiveness of biological control of the wheat aphid (Macrosiphum avenae) by the mite (Allothrombium ovatum) was studied from 2002 to 2004 in Luancheng County, Hebei Province, China. Results showed that the strip cropping of wheat and alfalfa significantly increased the egg and larval densities...
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