论文部分内容阅读
多年采用硫磺粉防治橡胶树白粉病的研究结果表明:第一次全面喷粉的最适宜时机是在病情总指数1～3(古铜叶期,相当于嫩叶发病率10～20％)和4～6(淡绿叶期,相当于嫩叶发病率25～40％);硫磺粉细度以325筛目为最佳;其适宜剂量为每亩0.5～0.8公斤;有效期7～14天。筛选35种新农药,未选出一种在成本和防效上比硫磺粉优越的农药。引进及仿制了一种优良机具丰收—30喷粉机。航空防治结果表明:航空防治具有与地面防治一致的效果,喷粉均匀,工效较高,是有发展前途的防治技术。
The results of the research on powdery mildew prevention and control of rubber tree for many years showed that the most suitable time for the first comprehensive dusting was the total disease index of 1 ~ 3 (bronze leaf stage, equivalent to 10 ~ 20% incidence of young leaves) and 4 ~ 6 (light green leaf period, equivalent to the incidence of young leaves 25 ~ 40%); fineness of sulfur powder to 325 mesh for the best; the appropriate dose of 0.5 to 0.8 kg per acre; valid for 7 to 14 days. Thirty-five new pesticides were screened, and one pesticide that was superior to sulfur powder in terms of cost and effectiveness was not selected. The introduction and imitation of a good harvest of good equipment -30 duster. Aviation control results show that: aviation control has the same effect with the ground control, dusting uniform, high efficiency, is a promising prevention and control technology.