花园养护看夏季园林树木如何进行病虫害防治


一、松毛虫。用25%马拉硫磷、25%乐果、25%辛硫磷,用量为2500-3000倍液,在7月份6龄幼虫时喷洒防治。
二、美国白蛾。在6月下旬至7月上旬,用25%灭幼脲和40ppm加敌百虫1000倍液喷洒树冠,防治1-3龄幼虫。
三、大袋蛾。7月中下旬卵孵化盛期时,喷洒90%敌百虫晶体1000-1500倍液,2.5%溴氰菊酯乳油5000-10000倍液;或在7月下旬至8月上旬,在被害树干茎部均匀打3个孔,注入50%久效磷乳油或80%磷胺乳油20-40倍液3-5毫升,然后用泥封上注射孔。
四、榆蓝叶甲。在7月上旬,将群集于树干上的化蛹幼虫集中烧毁,或喷洒2.5%溴氰菊酯乳油8000-10000倍液,40%氧化乐果2000倍液。
五、落叶松鞘蛾。在6月下旬成虫羽化率为40%-50%和70%时,各使用一次五氯酚钠烟剂杀灭成虫,或于7月初,用灭幼脲Ⅲ号1000倍液喷杀其卵。
六、柳蛎盾蚧。于6月下旬至7月上旬,若虫孵化期,隔7-10天喷一次50%杀螟松乳油600-800倍液,或40%氧化乐果1000倍液。注意在介壳形成前施药,介壳形成后施药不易渗透。
七、青杨虎天牛。6月下旬至7月,隔10-15天向枝干喷洒一次50%杀螟松乳油800倍液杀卵和初孵幼虫。
八、杨干象。在6月下旬至7月下旬成虫羽化盛期,可喷50%杀螟松乳油、50%马拉硫磷1000倍液或2.5%溴氰菊酯乳油1000倍液,视虫情防治1-3次。
九、楠竹枯梢病。于6、7月份楠竹发枝展叶期喷洒50%多菌灵,70%甲基托布津1000-1500倍液,7-10天一次,连喷3次。
十、桃小食心虫。7月下旬,在树冠喷洒5%杀螟松乳油1000倍液或2.5%溴氰菊酯乳油2000-2500倍液。
十一、光肩星天牛和黄斑星天牛。用磷化铝、磷化锌制成的片剂、丸剂、毒签等堵树干最下部2-3个天牛排粪孔,用50%马拉硫磷乳油和40%乐果20-40倍液注射虫孔;也可用白僵菌注孔。

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