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北京市房山区持续6年对双条杉天牛、杨扇舟蛾进行了监测,并分别应用管氏肿腿蜂、松毛虫赤眼蜂进行了生物防治。根据田间调查松毛虫赤眼蜂对杨扇舟蛾卵平均寄生率为57.77%;管氏肿腿蜂对双条杉天牛幼虫寄生率为45.03%,平均虫口减退率46.27%。6 a累计释放蜂共4.38亿头,防治面积1 713 hm2。节约防治费用105.248万元,挽回经济损失1 301.7万元,总经济效益达1 407万元。
Fangshan District, Beijing for 6 consecutive years of Cunninghamia lanceolata, Yang Fan moth were monitored, and respectively, the use of Trichotes muscle Trichogramma, Trichogramma dendrolimi biological control. According to the field investigation, Trichogramma dendrolimi had an average parasitic rate of 57.77% on Helicoverpa armigera. The parasitism rate of Scirpus mariqueter on the larvae of Coccinella septempunctata was 45.03% and the average reduction rate was 46.27%. In the past 6 months, a total of 438 million bee-bees were released, with a control area of 1 713 hm2. Save 1.05448 million yuan in prevention and control costs, restore economic losses of 13.717 million yuan and total economic benefits of 16.7 million yuan.