论文部分内容阅读
甘薯茎线虫病(空心病)1.发生特点主要危害薯块、茎蔓和薯苗。出苗前受侵,出苗率低;出苗后发病,薯苗矮小、发黄,纵剖茎蔓基部,可见褐色空腔;茎被横切后很少或不流白浆,逐渐表皮破裂,髓部呈褐色干腐状,剖开后无白浆。茎蔓受害后在主蔓基部拐子的上表皮出现黄褐色裂纹,逐渐变为褐色;髓部呈白色干腐,严重的基蔓变短,叶片发黄或主蔓枯死。
Sweet potato stem nematode (Hollow disease) 1. Occurrence of the main hazards of potato tubers, stem vine and potato seedlings. Pre-emergence invasion, the emergence rate is low; onset after emergence of potato seedlings short, yellow, longitudinal dissection of the base, showing brown cavity; stems after cross-cutting little or no flow of white pulp, and gradually broken the epidermis, pith Brown dry rot, cut open without white pulp. After the damage of stems and vines, the brownish brown cracks appeared on the upper epidermis of the main creeping bracts and became brownish brown; the white medulla showed dry stems, the serious creeping bracts became shorter, the leaves were yellow or the main bracts died.