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草毒白粉病是我市大棚草毒的重要病害,冬季普遍发生严重。笔者1998年1月10日在多湖乡王宅村、苏孟乡后徐村等草莓种植区调查,一般田块白粉病病果率在30％左右,病情指数20％左右;严重田块病果率在50％以上,病情指数30％以上。1/3以上的草莓种植户因该病不但没有收益,而且亏了本,经济损失惨重。1 发病特点 1997年冬季白粉病主要发生在草毒果实上和花、花柄上,1998年3月中旬开始在草莓叶片上蔓延。发生特点是发病早、蔓延快、受害重。1997年11月中旬,顶花序的顶果上就开始发病。据在本所
Grass powdery mildew is an important disease in our city greenhouse poisoning, the winter is generally serious. On January 10, 1998, the author investigated the strawberry growing areas in Wangzhai Village and Sumeng Township of Duhuo Township on January 10, 1998. The prevalence of powdery mildew in field was about 30% and the disease index was about 20% Fruit rate above 50%, disease index above 30%. More than 1/3 of the strawberry growers because of the disease not only did not benefit, but also loss of the economy suffered heavy losses. 1 incidence characteristics powdery mildew in winter in 1997 mainly occurs in the grass and fruit flowers and flower stalk, in mid-March 1998 began to spread on strawberry leaves. Occurred earlier is the incidence, spread quickly, victimized. In mid-November 1997, the top of the top inflorescence began to attack. According to the firm