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梅树等蔷薇科核果类果树对施用乐果等含硫农药较敏感,施用后会产生药害,特别是在萌芽开花期施用,则药害更重.我县曾发生多起梅树施用乐果造成药害现象.受害轻的则引起生理缺肥,叶片枯萎;受害重的甚至枝干枯干,严重影响树势.这是因为乐果的游离硫较多,会破坏酸梅树的叶绿素.从而,使光合作用受到破坏.故防治蚜虫不能用乐果,可选用50%乳油杀螟松等药剂.未结果的树或结果树在结果前也可使用甲胺磷.对已发生药害的梅树,受害较轻仅产生落叶的可采用多灌水,用0.1%尿素液进行根外追肥等办法促进其恢复生机.我县果农采用浇适量的稀人粪尿的办法,效果也较理想.对药害严重,枝干已干枯者,应将枯枝剪除,并加强管理,促其重发枝叶.
Pomegranate and other Rosaceae stone fruit trees are more sensitive to the application of dimethoate and other sulfur-containing pesticides, resulting in phytotoxicity after application, especially in the bud and flowering period, the more serious injury. Fruit injury caused by injury to the light is caused by physiological lack of fat, leaves withered; victims of heavy or even dry branches, seriously affecting the tree vigor. This is because dimethoate more free sulfur, will destroy the chlorophyll sour plum. Thus, the photosynthesis is destroyed, so the prevention and treatment of aphids can not be used dimethoate, 50% cream can be used fenitrothion and other agents.Uncluded the tree or result tree before the results can also be used methamidophos. Plum trees, victims of light only produce deciduous can be used more irrigation, 0.1% urea solution for root top dressing and other ways to promote their vitality.Our county fruit farmers with appropriate amount of diluted human waste method, the effect is also more satisfactory. Severe injury, branches have been withered, should cut off the dead branches, and strengthen management, prompting its repeated branches and leaves.