青海春小麦赤霉病的发生状况与田间防治试验

近年来，小麦赤霉病在青海各春小麦种植区均有不同程度的发生，已成为青海春小麦生产上重要病害之一。轻病田病穗率在2％～9％，重病田可达50％以上，个别田块高达100％。赤霉病的发生主要是在青海省东部农业区，并以黄河、湟水流域，实行小麦和玉米套种或冬春麦混种的地区发病较重。用多菌灵、灭病威、甲基托布津三种杀菌剂，进行大田防治小麦赤霉病试验，其防治效果可达60．50％～88．60％。多菌灵、灭病威、甲基托布津一次和二次喷雾防治小麦赤霉病的效果存在显著差异。25％多菌灵可湿性粉剂、40％灭病威胶悬剂喷施的有效剂量均为750g／hm^2，75％甲基托布津可湿性粉剂为900g／hm^2。

Occurrence Situation of Spring Wheat Scab and Chemical Control Experiment in Field in Qinghai Province

In recent years, wheat scab at each wheat planting region of Qinghai all have occurrence of different degrees and which has become one significant disease of Qinghai spring wheat production. The rate of infected ears was at 2 %-9 % in lighter disease cropland, may be over 50 % in more serious disease cropland, infected ears rate of individual cropland would attain to 100 %. Wheat scab chiefly existed and taken place more seriously in the eastern agricultural region of Qinghai province and with areas of wheat and corn interplanting or winter and spring wheat interseeding in the Yellow River and Huangshui basins of Qinghai. The field experimental results of Control Wheat Scab showed that by 25% Carbendazim WP and 40% Miebingwei SC and 70 % Thiophanate-methyl WP were used for spraying control wheat Scab during contin uous two years in Huangzhong county of Qinghai province, their controlling effects could be accessible to 60.50 %- 88.60 %. Effects ofcontrolling wheat scab, between one and two spray with Carbendazim and Miebingwei and Thiophanate-methyl came into existence significant difference. Effective doses of spraying Carbendazol or Miebingwei were separately 750 g/ha, and but Thiophanate-methyl was 900 g/ha.