【摘要】 <正> 要保护天敌,对害虫各代的天敌都要加以注意,害虫越冬代的天敌更不能忽视。调查害虫越冬代的天敌寄生率对预测当年害虫发生程度和采取相应措施保护害虫越冬代天敌是有意义的。虽然某些害虫越冬代天敌寄生率的调查较困难,但为探明害虫越冬代寄生率状况,我们对水稻主要害虫越冬代天敌寄生率进行了调查。现将1976年以来调查结果分述如下。更多还原

【Abstract】 The results of investigations indicated that the Parasitic ratio of rice leaf folder, Yellow rice borer, rice stem borer, rice planthopper and rice leaf hopper by natural enemies were generally about 15％ in hibernant stage. The numbers of hibernant insect pests were controlled by the natural enemies to a corresponding effect.更多还原