疫病:苗期、成株期均可染病。当幼苗长20厘米以后,疫病病斑由叶片向主茎蔓延,使茎变细并呈褪色,至全株萎蔫或打倒。叶片染病多从植株下部叶尖或叶绿开始,发病初期为暗绿色水渍状不整形病斑、扩大后转为褐色。防治:抓住发病初期用72%锰锌、霜脲WP 500倍液或69%安克锰锌WP900倍液或64%杀毒矾WP400倍液或58%甲霜灵,锰锌WP500倍液隔7~10天喷雾1次,防治2~3次。 Disease: seedling, adult can be infected. When the seedlings grow 20 cm later, the blight spreads from the leaves to the main stem, causing the stem to become thin and fade to the point where the whole plant wilting or knocking down. More leaves from leaf tips or leaf green plant began, the incidence of early dark green water-like non-shaped lesion, expanded to brown. Control: seize the early onset with 72% Mn-Zn, cream urea WP 500 times or 69% Anker Mn-Zn WP900 times or 64% antivirus WP400 times or 58% metalaxyl, Mn-Zn WP500 times every 7 ~ 10 days spray 1, control 2 to 3 times.