排序方式: 共有23条查询结果,搜索用时 15 毫秒
11.
麻点豹天牛化学防治试验研究 总被引:2,自引:0,他引:2
经多种农药、剂量、防治方法的反复比较,筛选出树干涂刷、注干、喷雾、喷烟等多种较理想的麻点豹天牛防治方法和措施:应用5%氯氰菊酯乳油、2.5%保得乳油分别与柴油1:150倍混合药剂进行树干涂刷,麻点豹天牛卵及幼龄幼虫防治死亡率达80%以上,最佳防治时期为产卵期及幼虫孵化期;应用5%氯氰菊酯、2.5%保得乳油分别与柴油1:75倍混合药剂喷烟防治成虫,死亡率达85%以上,最佳防治时间为9月上旬至11月中旬;树干注药是该虫整个幼虫期较为有效的防治方法。 相似文献
12.
IntroductionDuringapproximately2Oomillionyears'coexistence,plantandanimalkingdomshaveaffected-eachotherindifferentways.ManyplantsproduceaIlelochemicals(secondaryplantsubstances)whichaffectonthelifeofherbivores.Someoftheallelochemica1scaninterferewiththeho… 相似文献
13.
14.
15.
16.
17.
18.
19.
经频数分布法和聚集度指标测定分析 ,柳毒蛾在防护林的空间分布型为聚集分布 ,以核心分布更为适宜。应用 Iwao( 1971)平均拥挤度 ( m* )与平均数 ( X)的回归关系 ,制定出最适理论抽样数和序贯抽样技术。 相似文献
20.
The watermark disease of willows was recently identified in Japan for the first time, in the northern island of Hokkaido. During spring and summer, the leaves and branches of affected trees suddenly wilted and some trees died. When affected branches or trunks were cut, a distinct, watery, reddish-brown or brownish-black stained zone (watermark) was seen in the sapwood. The causal bacterium was isolated from the watermark and identified as Erwinia salicis by its bacteriological characteristics. Inoculation tests confirmed its pathogenicity to willows. 相似文献