1·Leaf mould was attacked by Fusarium nival, and had effect on perennial ryegrass's leaves and tillers, leading turf to become sparse.
叶腐病由腐霉属真菌的菌丝体危害所致，主要损害多年生黑麦草的叶片，影响植株分蘖，造成草坪自然稀疏。