【摘要】 <正> 蚕豆叶茎枯死症,是近年来我省蚕豆生产中危害较为严重的一种病害。据1985年的不完全统计,全省发病面积不少于20万亩。各蚕豆产区都有不同程度的发生,其中以玉溪、通海、澂江、弥渡、江川、大理、晋宁等县市发生最普遍。由该病造成的损失,一股都在60%以上,相当大面积的田块毁产。主要症状表现为,簇顶、矮化、叶节距缩短、中上部叶片叶缘首先表现枯死状,最后叶茎完全枯死。 蚕豆叶茎枯死症,在我省由来已久;群众称为“柿花叶病”、“矮缩病”、“莴笋豆”、更多还原

【Abstract】 This paper repots a physiological potassium deficiency of broad bean in our country which is very popular and is seriously affecting the production of broad bean in Yunnan Province. This disease is due to the potassium deficiency in the soil, which is unable to meet the requirements of broad beans for growth and development.The characteristic symptom of the disease is a bunchy-top with stunted stem, and the leaves and stem gradually wither and die. According to the severity of potassium-deficiency, the deficiency symptoms can be divided into two types: "stunted" and "nonstunted" When the deficiency is severe, the plant is stunted, and the leaves from middle part of the stem to the top withered. This is because that potassium deficiency is most extreme in these eaves. In addition, the total nitrogen content of the diseased plant is higher than that of the healthy one. The key measure for control is to apply adequate potassium fertilizer.更多还原