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江苏省丰县蔬菜管理办公室(221700)汪彩云答复如下:山药根结线虫病主要发生在地下块茎;发病严重者,地上部表现叶色淡、生长弱、植株繁茂性差。病株在地下块茎的表皮上产生许多大小不等的馒头形的瘤状物,瘤状物相互愈合、重叠形成更大的瘤状物(俗称大疙瘩),常撑破地表土壤,形成
Feng County, Jiangsu Province, Vegetable Management Office (221700) Wang Caiyun replied as follows: yam root knot nematode disease occurs mainly in underground tubers; severe cases, the performance of the ground above the leaf pale color, weak growth, poor lush plants. Strain in the underground tubers of the epidermis to produce a number of bread-shaped tumor of varying sizes, tumor healing to each other, forming a larger overlap of the tumor (commonly known as large lumps), often breaking broken surface soil, the formation of