高海拔地区反季节甘蓝霜霉病调查及药剂防治试验

Investigation of downy mildew of off-season cabbage planted in areas with a high elevation and its pollution-free control in Guizhou

2005年，在黔西北地区大方县达溪镇进行了夏秋反季节甘蓝霜零病发生危害调查及田间药剂防效试验。结果表明，8月上旬至9月下旬均有霜零病发生，8月上旬开始发病．病情随甘蓝株龄的增加而上升，病情指教1．23—35．31，以9月下旬最高。选用5种农药作防效试验．筛选出2种防治甘蓝霜零病效果较好的药剂，防治效果分别达87．44％-85．77％和86．01％-83．37％．适合防治甘蓝霜零病，可在生产上应用。

The investigation of downy mildew of off-season cabbage and its pollution-free control experiment were carried out in Daxi town with a high elevation, Dafang county, Guizhou. The results showed that the downy mildew occunrred on the first ten-day of August and the disease index raised with increasement of the cabbage plant age,and the disease index was from 1.23 （ the first ten-day of August ） to 35.31 （ the last ten-day of September）. Two postcides with the efficiency control effect were selected from five pesticides in the experiment of controlling downy mildew,and their control effect were 87.44 % -85.77 % and 86.01% -83.37 % respectively,which can be used in cabbege production.