一、霜疫霉病1.发病症状。该病属真菌病害,主要危害果实,也危害花穗和嫩叶。植株受害后,病部呈水渍状、褐色,表面有白色霉状病原茵,致使果实腐烂脱落,花果腐烂或干枯。连续阴雨天气,气温22~25℃、湿度高、通风透光差的果园发病迅速,特别是在果子着色后,该病发生严重。2.防治方法。采果后及时清园、修剪,减少初侵染源。在开花前后特别是果子着色期,用90%乙磷铝锰锌500倍液、25%瑞毒霉600倍液、58%瑞毒霉锰锌400倍液、64%“杀毒矾”600倍液等药剂喷施3~4次。合理施肥,要 Frost blight 1. Symptoms. The disease is a fungal disease, the main hazards of fruit, but also endanger the spikes and young leaves. Plant damage, the disease was water-like, brown, white mildew on the surface of the pathogen of the original cause of decay, fruit decay or dry. Continuous rainy weather, temperature 22 ~ 25 ℃, high humidity, poor ventilation and light orchards rapid onset, especially in the fruit coloring, the serious disease. 2. Prevention methods. After harvesting fruit garden in a timely manner, pruning, reducing the source of initial infection. Before and after flowering, especially during the fruit coloration period, it was treated with 500 times of 90% ethofinite, 600 times of 25% reesei, 58% of rebemycin and manganese of 400 times, 64% of “antivirus” 600 Times and other agents spraying 3 to 4 times. Rational fertilization, to