药剂混用防治多种小麦病虫害的初步研究

 本试验采用三因素五水平回归通用旋转组合设计，选择对小麦锈病、白粉病、粘虫和麦蚜具有特效的粉锈宁、灭幼脲和抗蚜威3种药剂，进行混用防治多种小麦病虫的研究。结果表明以上药剂混用喷施1次，对上述病虫有较好的防治效果，但无增效作用。通过单病虫防治模型和药剂混用与产量的关系模型分析,在125个混配组合中，有6个组合的防治效果和千粒重增加均较显著，其配比组合多为灭幼脲和抗蚜威中等以上剂量，粉锈宁为高剂量。

FIELD EXPERIMENT ON THE EFFICACIES OF MIXED PESTICIDES AGAINST WHEAT PESTS

In 19S7, the efficacies of differeni dosage combinations of three selective pesticides; namely, dimilin, pirimicarb, and havleton, against oriental armyworm, wheat aphid, wheat rust and wheat powdery mildew were tested synthetieally in wheat field in Luohe, Henan Province, arranged by the general rotary regression design. The results indicated that one application of the pesticide mixture was good enough but was not synergism to control the wheat pests mentioned above. Six out of the 125 level combinations, including the medium dosages and more of dimilin anti pirimicarb and high dosage of bayleton, got significant efficacies on the decreasing occurrences and increasing thousand kernel weight.