小麦不同品种上麦蚜及其天敌的数量变动

试验结果表明小麦品种 (系 )的抗性对麦蚜种群数量影响很大 ,百株蚜量随着小麦品种抗性增强而下降。而同一小麦品种对不同种蚜虫的抗性存在质的差异 ,铭贤 1 69品种 ,蚜高峰期百株蚜量麦长管蚜 63 0头 ,禾谷缢管蚜只有 1 1 5头 ,两者相差 5 5倍。另一方面 ,小麦品种抗性对麦田天敌的种群数量影响不大 ,而对天敌的发生期有些影响。因此 ,小麦品种抗性、天敌对麦蚜的自然控制能力 ,可把小麦中后期的蚜虫虫口密度控制在经济损失允许水平之下。

Population dynamics of wheat aphids and natural enemies in different wheat varieties.

The population of wheat aphids ( Rhopalosiphum padi Linnaeus, Macrosiphum avenae Fabricius) was affected greatly by the resistance in wheat varieties. The amount of wheat ophids per 100 wheat plants decreased with increasing of the resistance of wheat varieties. Responses of two aphid species to the same wheat varieties such as Minxian 169 were significantly different. The aphids of M. avenae per 100 wheat plants (630 aphids per 100 wheat plants) were 5 5 times that of R. padi (115 aphids per 100 wheat plants) at the peak stage of wheat aphids. On the other hand, the populations of natural enemies were not affected by the resistant varieties. Results suggested that resistance of wheat varieties and natural enemies could play an important role in controlling wheat aphids under economic threshold in the mid later stage of wheat development.