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1) controlling effect and best preventive time
防治药剂与适期
2) vulnerable period
防治方法与适期
3) optimum control stage
防治适期
1.
Studies on the optimum control stage of rice green smut in late single planted rice fields;
单季晚稻稻曲病防治适期研究
2.
The results showed that the optimum control state is larvae and the optimum control stage is the young instar of larvae.
对各虫态进行了大量的室内和田间药剂试验,结果表明:最适防治虫态为幼虫,防治适期为低龄幼虫盛发,及在晴天进行防治时以17∶00时后喷药效果最
4) optimum control period
防治适期
1.
Field population dynamic and optimum control period of Melanaphis sacchari in Chaoyang region,Liaoning.;
辽宁朝阳地区高粱蚜田间消长规律及防治适期
2.
The field population dynamic and optimum control period of wheat aphids in Chaoyang Region, Liaoning;
辽宁省朝阳地区小麦蚜虫田间消长规律及防治适期
3.
Studies on economic threshold and optimum control period of Echinocnemus squameus Billberg;
稻象甲的防治指标和防治适期研究
5) optimum control time
防治适期
1.
On the basis of thorough investigation on the fluctuation of important pest insects with piercing and sucking mouthparts in flower shrubs in gardens of Tianjin,the optimum control time was determined.
在查清天津市园林主要花灌木刺吸口器害虫桃粉蚜、绣线菊蚜、棉蚜和山楂红蜘蛛发生消长规律的基础上 ,确定了防治适期和结合点 ,筛选出 10 %吡虫啉、绿灵、蚧螨灵、 1。
6) Appropriate period prevention
适期防治
补充资料:防治大棚草莓病虫害的几种药剂
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