症状特征及原因 轻病薯外表无明显症状,病薯脐部皱缩凹陷,纵切薯块可见自基部开始维管束变淡黄色或乳黄色;稍挤压可见乳黄色粘稠菌液。植株发病初期自顶端复叶开始萎蔫,中午
img align=left src=../image/4283.jpg 马铃薯瓢虫 Henosepilachna vigintioctomaculata (Motschulsky,1857
马铃薯瓢虫 Henosepilachna vigintioctomaculata(Motschulsky) 4昆虫种名:马铃薯瓢虫 Henosepilachna
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