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通过日本看麦娘（Alopecurusjaponicusstend）和大巢菜（ViolasativaL．）在套种麦田消长规律的调查，进行了该二种杂草影响套种麦产量的初步研究，建立了产量损失率预测式，并结合当地常用除等措施下的经济阈值，提出了该二草的复合防除指标。试验结果表明，小麦产量损失率与日本看麦娘、大巢菜的发生均呈正相关，复相关式为：Y＝0．0191X1＋0．0911X2＋6．5729，复合防除指标是动态的。
A preliminary study on the effects of the two weeds on the wheat yield in intercropping wheat fields was conducted through the investigation of the laws of the decline and growth of intercropped wheat fields in Japan through Alopecurus japonicussstend and Viola sativa L. A prediction formula of the yield loss rate was established, Commonly used in addition to such measures under the economic threshold, put forward the two grass compound control indicators. The results showed that the yield loss rate of wheat was positively correlated with the occurrence of Ophiopogon japonicus and Larvae in Japan. The complex correlation was Y = 0.0191X1 + 0.0911X2 + 6.5729, and the compound control index was dynamic.