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宁夏银川地区人工培育砂生槐幼苗,育苗初期有灰地种蝇幼虫(根蛆)大量发生,据调查,其幼虫在5月上、中旬发生为害较严重,到6月中、下旬出现第2个为害高峰;其成虫的发生主要集中在5月下旬和6月上旬。选用3种常用化学药剂和3种新型生物药剂对砂生槐试验地内的灰地种蝇幼虫进行防治。结果表明,6种药剂对灰地种蝇幼虫均有一定防治效果。3种化学药剂的防效均高于3种生物药剂,速效性也较高;而3种生物药剂的防效比较稳定,药后7 d防效均达到70%以上。
In Ningxia Yinchuan area, artificial germination of Sophora moorcroftii seedlings, the gray seedling fly larvae (root maggots) occurred in the early stage of seedling emergence. According to the investigation, the larvae were more severely damaged in mid-May and mid-May. In the middle and late June, A damaging peak; the occurrence of its adults mainly concentrated in late May and early June. Three kinds of commonly used chemical agents and three kinds of new biological agents were selected to control the gray land species larvae in the test area. The results showed that six kinds of agents on the gray landfly larvae have a certain control effect. The three kinds of chemical agents have higher anti-efficacy than the three kinds of biological agents, and the quick-acting property is higher. The three kinds of biological agents have relatively stable anti-efficacy, and their anti-efficacy reaches more than 70% after 7 days.