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有读者来电话问:防治水稻穗颈瘟,能否在破口前5~7天和破口期分别施用三环唑和苯甲·嘧菌酯?穗颈瘟是发生在穗颈处(穗轴与稻穗连接部位)的稻瘟病。病斑初期呈水渍状褐色小点,以后逐渐扩展呈褐色或黑绿色。发病早的多形成白穗,发病迟的瘪粒增加,粒重降低,影响米质。穗轴和枝梗也可发病,症状与穗颈发病相似。湿度大时,以上发病部位都可产生灰色霉层。水稻穗颈在始穗期最易感病,这是因为水稻始穗后叶
A reader calls to ask: Prevention and treatment of rice panicle blast, can be in the 5 to 7 days before the breach and the breach of the mouth were administered tricyclazole and azoxystrobin? Panicle blast occurred in the panicle (spike Shaft and panicle connecting parts) of the rice blast. Early lesions were brown spots water stain, then gradually brown or black-green. The incidence of early formation of more white spike, delayed onset of increased shrunken grain weight decreased, affecting the quality of rice. Coils and branches can also be sick, symptoms and ear disease similar. Humidity, the incidence of these parts can produce gray mold layer. Panicle neck of rice is most susceptible to disease at the beginning of panicle, which is due to the posterior leaves of rice