如何防治二代美国白蛾美国白蛾是近年来由美国传入我国的害虫，对林业、果树、花卉为害极大，造成严重减产减收。美国白蛾一年发生二代，一代为每年的６月上旬至中旬；二代为每年８月上旬至中旬，８～９月份正是防治二代美国白蛾的好时期。可采取下列措施防治美国白蛾。１... How to control the second generation of American white moth Caterpillar is a pest introduced into our country by the United States in recent years, causing great damage to forestry, fruit trees and flowers, resulting in serious reduction of production and reduction. The second generation of the American white moth takes place from the first half of June to the middle of the first half of every year. The second generation is the first half of August to the middle of August. The eighth to the ninth months are the good times to control the second generation of the American white moth. The following measures can be taken to control the American white moth. 1 ...