带枯病此病是坦桑尼亚剑麻最普通的营养缺乏病,它是由缺钾引起的。在剑麻园,此病最初发生在不到一公顷的小块地上,尔后逐步扩大,可能蔓延到广大地区。各类土壤都会发生带枯病。初期症状为直径约1—2毫米的灰绿色和褐黄色的细小斑点,斑点发生在叶片背面,通常在叶颈部,要不就在球状茎基部。叶片基部还可能同时发生普通的白化即退绿。随着病情发展,斑点扩大 With blight The disease is Tanzania’s most common nutritional deficiency sisal disease, it is caused by potassium deficiency. In Sword and Smelly Maucao, the disease first occurred on small plots of less than one hectare and then gradually expanded, possibly spreading to vast areas. All kinds of soil will occur with blight. The initial symptoms are finely grayish-green and yellowish spots with a diameter of about 1-2 mm. The spots occur on the back of the leaves, usually at the leaf-neck or at the base of the bulbous stem. Leaf base may also occur at the same time ordinary albino green back. As the disease progresses, the spots expand