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糖用甜菜的白粉病是新疆地区甜菜生产上的一大病害,每年发生都很严重,被害株率达85—100％,感病指数为50—78％。糖用甜菜因白粉病为害,减产达12％,含糖量降低1.2度。我们在1958年和1959年进行了多次的防治验试,并已基本上得到了有效的防治方法。 白粉病对硫磺制剂很敏感,故防治效果也非常显著。但喷药的时期掌握不准,不仅要增加用药量,而且还会降低其防病效果,从而不能达到澈底消灭该病的目的。因此设计了不同药剂和防治时期的验试,今将结果整理如後。
Sugar beet powdery mildew is a major disease in the production of sugar beet in Xinjiang, each year are very serious, the victim strain rate of 85-100%, the susceptibility index of 50-78%. Sugar beet disease due to powdery mildew, cut 12%, sugar content decreased by 1.2 degrees. We conducted a number of preventive tests in 1958 and 1959, and we have basically obtained effective prevention and control measures. Powdery mildew is very sensitive to sulfur preparations, so the control effect is also very significant. However, the spraying period is not controlled, not only to increase the dosage, but also reduce the effect of disease prevention, which can not achieve the ultimate elimination of the disease. Therefore, the design of different agents and prevention and control of the test, the results will be sorted as follows.