韭菜的叶片上出现小白点和烂尖是发生灰霉病的具体表现。该病主要为害叶片，从病害症状的特征上可人为地分为白点型、干尖型、湿腐型三种。白点型最初在叶片正面或背面着生白色或浅灰褐色小斑点，由叶尖向下发展，病斑梭形或椭圆形，可互相汇合成斑块，致使半叶或全叶枯焦... Leek leaves appear white spots and rotten tip gray concrete occurrence of the concrete manifestation. The disease mainly leaves damage, from the symptoms of disease symptoms can be divided into white point-type, dry-type, wet-type three. The white spot type is initially white or light grayish brown spots on the front or back of the leaves. It develops downward from the tip of the leaves. The spots are fusiform or oval, which can merge with each other into plaques, resulting in half-leaf or whole-leaf dead focus. .