Mummified aphids densityThe peak Mummified aphid densities was occurred inall treatments on May 30 (Fig. 3). On this date, mummifiedaphids densities were lower in CK plots than inDD and WGI plots (Beijing 837: F3, 12=20.41, P<0.05;Zhengzhou 831: F3, 12=21.32, P<0.01). Although GOBalso increased parasitism of S. avenae, there was nosignificant difference between GOB and CK treatmentsin the two cultivars.
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