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我队肩负城市绿化及苗圃育苗双重任务,每年在病虫防治方面付出很大代价,仅农药开支达1800元左右,而且在打药时普遍存在着“虫越大越讨厌,药越打就越浓。”过去打药不分虫体大小,不分虫子种类,不分是防是治,一概采用90%敌百虫以350～400倍进行打药,既浪费了药,又易产生药害。危害我市园林树木的主要害虫是避债蛾,其次是刺蛾,豆天蛾,前者危害严重,而且躲在袋囊内,不易直接接触药物,故杀伤力较差,因此我们用90%敌百虫对避债蛾防治浓度进行了优选。优选范围:500—2000倍(即一份药稀释的倍数)用0.618法取试验点:
Our team shoulder the dual tasks of afforestation and nursery nursery in urban areas. Every year, PetroChina pays a great price for its pest control. Pesticides alone cost about 1,800 yuan. In addition, there is a general feeling that “the bigger the pest is, the more annoying it is. ”In the past, regardless of insecticidal insecticide size, regardless of the type of insects, regardless of the anti-governance, all use 90% trichlorfon 350 to 400 times to fight drugs, both waste medicine, but also prone to injury. The main pests that endanger the garden trees in our city are shelter moths, followed by the thorn moths and the bean moths. The former is seriously endangered, and is hidden in the pockets. It is not easy to directly contact with the drugs and thus has less lethality. Therefore, we use 90% 100 insects on the shelter moth prevention and control concentration was optimized. Preferred range: 500-2000 times (ie, a dilution of the drug) 0.618 method to take the test point: