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用蓖麻油渣防治山楂树花象(虫甲)、各种金龟子等食芽食花害虫,防治率可达98. 2％。蓖麻油渣防治山楂树食芽食花害虫的具体方法是:先将2. 5公斤的蓖麻籽放在锅里,用文火炒熟至微黄色,用碾子碾细或捣烂,然后放在锅内加水35公斤,煮沸,搅匀。这时再把玉米轴放在锅中(玉米轴多少以液体浸透为准),再煮沸20分钟,待液体浸透玉米轴后捞出备用。投药时间,要在幼芽膨大期(4月中、下旬)和盛花期(5月下旬)
2%. Castor oil residue control hawthorn flowers (insects), all kinds of beetles and other food bud pests insects, prevention and control rate of up to 98.2%. Castor oil residue control hawthorn food bud pests specific method is: first 2.5 kilograms of castor beans in the pan, simmering until slightly yellow, with a fine grinding or crushing, and then placed on 35 kilograms of water in the pot, boil, stir well. At this moment, put the corn shaft in the pot (how much the corn shaft is saturated with liquid), and then boil for 20 minutes until the liquid has been soaked in the corn shaft and remove the spare oil. Dosing time, to inflated in buds (mid-April, late) and flowering (late May)