贵州省林科所在1965年应用621烟剂防治松枯害虫时,偶然发现原来林分中严重的落针病不见了,他们抓住这个偶然现象,经过五、六年,反复实践,发现两体666确实对松杉落针病(叶枯病),赤枯病均有较好的效果。由于试验时既有本所的又有各地群众性的防治试 When the forestry department of Guizhou Province applied the 621 tobacco agent to control pine and insect pests in 1965, they accidentally discovered that the serious needle-dropping disease in the original forest was gone. They seized this accidental phenomenon. After five or six years of repeated practice, they found that two Body 666 indeed Pinus fir needle disease (leaf blight), red wilt have a good effect. Because of the test, we have both local mass prevention and control tests