苹果煤污病俗称“水锈病”,一般在果实近成熟期发生,在多雨年份发病更为严重,有损果实外观,降低其商品价值。 一、发病原因。果实6月初到采收前均可被浸染。7月中下旬至8月下旬为侵染盛期,其主要因素是湿度过大,如地势低洼、窝风、积水、地面杂草丛生,树冠郁密通风透光不良等因素均可造成煤污病 Commonly known as “water rust”, coal-smear of apple is generally occurred in the fruit near maturity and more serious in the rainy years, impairing the appearance of fruits and reducing the value of their commodities. First, the cause of the disease. Fruits can be dip before harvesting in early June. The middle and late July to late August is the peak period of infection. The main factors are excessive humidity, such as low lying, nest wind, stagnant water, overgrown weeds and crowns, densely ventilated and poor light of the canopy, and other factors can cause coal Dirty