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8～9月第二代幼虫开始危害,要针对初孵幼虫聚集食叶的特性,及时喷药,可事半功倍。这一代幼虫发生不整齐,晚的可延续到9月中下旬,给防治工作带来一定的难度。喷药最好在二三龄结巢前进行,若已结巢,则必须淋透虫巢。另外喷药以傍晚为宜。 3、清巢 8～9月可用小铁齿耙将鸟巢状虫苞从树上梳除下来,集中烧毁。 4、除茧 9～10月老熟幼虫开始在土中结茧越冬。结茧时吐丝和泥土粘在一起,外壳形似一个泥团,茧长8～16毫米,宽4～10毫米,扁椭圆形,土黄色或土褐色。主要分布在香樟根际周围的松土层中,可在冬闲期间集中人力在受害植株附近仔细挖掘、清除,结合冬季松土也可冻死虫茧。也可于是9下旬在树根周围施25%速灭威粉剂等,毒杀欲结茧幼虫。
From August to September, the second generation of larvae begin to be harmed. To deal with the characteristics of newly hatched larvae gathering leaves, they should be sprayed in time and with less effort. This generation of larvae occur irregularly, the late can be extended to mid to late in September, to control the work to bring some difficulty. Spraying is best carried out before the age of twenty-three nests, if you have knot, you must be drenched nest. Another spray to the evening is appropriate. 3, Qing Chao 8 ~ September can be a small tooth harrow bird nest nematode bracts removed from the tree, concentrated burned. 4, in addition to cocoon September to October mature larvae began to cocoon overwintering in the soil. Cocoon silk and mud stick together, the shell shaped like a muddy, cocoon length 8 to 16 mm, width 4 to 10 mm, oblate, khaki or earthy brown. Mainly distributed in the rhizosphere of the cedar around the loose soil, during winter and leisure concentrated in the vicinity of the victim plant carefully tapped, clear, combined with winter loose soil can also freeze cocoon insects. Can also be applied in late 9 in the tree root around 25% of the speed out of Viagra powder, to kill cocoon larva.