今年4、5月间,中牟、尉氏、扶沟、宁陵四个国营林场在13万亩人工杨树林内,取样方挖土调查,每平方米内平均有杨梢金花虫幼虫、蛹97.8头,最多达398头以上。根据已往经验证明,如此虫口密度,势必酿成灾害,很有防治的必要。经过一系列准备后,我们于6月3—7日以郑州机场为起落基地,用飞机超低容量杀虫技术,在上述四个国营林场对杨梢金花虫进行了防治,取得 In April and May this year, Zhongmou, Weishi, Fugou, Ningling four state-owned forest farms in 130,000 acres of poplar, sampling side excavation survey, an average of every square meter goldenrod larvae, pupa 97.8 Head, up to 398 or more. According to the past experience shows that such density of insect population is bound to lead to disasters, prevention and control is necessary. After a series of preparations, we took the Zhengzhou Airport as a base for taking off and landing on June 3-7 and using the ultra-low-capacity insecticidal technology on the four state-owned forest farms,