北沟镇港里村200多亩果园,采用覆草技术后,引起金纹细蛾大量发生。1989年虽打了三遍药防治,但8月份以后,金纹细蛾被害率仍达83%以上,有的园片叶片焦枯脱落达30%,仅秋梢上端几片叶没有受害,直接影响树体生长和花芽形成。 1990年春进行了性诱芯防治,每亩平均挂1.5个诱芯碗,4月20? Beidou town of Hong Kong more than 200 acres of orchard, using grass-covered technology, causing a large number of gold-bearing moth occurred. Although the drug was hit three times in 1989, after August, the damage rate of the gold moth was still over 83%. Some of the foliage leaves scorch off by 30%. Only a few leaves at the top of the fall tip were not directly affected Tree growth and flower bud formation. In the spring of 1990, a sexual assault prevention and treatment was conducted, with an average of 1.5 entrained bowls per acre, April 20?