南瓜抗性强,过去病害危害一般较轻,近年由于籽用南瓜连年大面积种植,为病害的发生危害提供了有利的条件,病害呈现逐年加重的趋势。南瓜病害中除危害性最大的疫病外,经常发生的还有炭疽病、白粉病和细菌性角斑病等多种病害。 一、南瓜炭疽病 1.症状 炭疽病主要发生于叶片上,初为油渍状小斑点,后扩大成暗褐色、圆形或长椭圆形斑,稍凹陷,边缘明显,温度高湿度大时病斑上能产生粉红色粘稠状物,为病菌子实体。果实发病较晚,被病菌侵染后先产生油渍状病斑,后变成圆形黑褐色病斑、凹 Pumpkin resistance is strong, the disease damage in the past is generally lighter. In recent years, the large-scale planting of pumpkin in successive years has provided favorable conditions for the occurrence of the disease. The disease shows a trend of increasing year by year. Pumpkin disease in addition to the most harmful diseases, there are often occurring anthracnose, powdery mildew and bacterial angular disease and other diseases. First, the pumpkin anthrax 1. Symptoms anthrax occurs mainly in the leaves, the beginning of the small spots of the oil-like, and later expanded into dark brown, round or oblong spots, slightly depressed, the edge is obvious, the temperature high humidity when the disease spots Produce a pink sticky substance, as a pathogen fruiting body. Fruit onset later, after infection by the bacteria first stain-like spots, after turning into a round dark brown spot, concave