8月酷暑。螨类造成的水杉红叶、香樟叶片变色等均已很明显,方翅网蝽已使严重受害的悬铃木出现整株灰白的症状,但对以上情景人们只能徒叹奈何,因防治适期已经过去。8月份水杉的赤枯病现象已经普遍出现;刺蛾已是第二代幼虫危害期;天牛幼虫危害症状越来越明显,有的已蛀入较深,击卵和表面喷施内渗药剂已收效甚微了,最好采用钩 August heat. Mites caused by the leaves of redwood, camphor leaf discoloration, etc. have been very obvious, square wing stink bug has caused serious damage to the whole plant Symptoms of the entire plant gray, but people can only act as sigh in the above scenario, because the prevention and treatment of the appropriate period has been past. In August, the red wilt disease of Metasequoia glyptostroboides was widespread. The thorn moth was the second generation larvae. The harm symptoms of the beetle larvae became more and more obvious. Has been ineffective, it is best to use the hook