1.广西戚林问:吉庆果的果实上生有黑斑块,是病害吗?如何防治? 答:吉庆果的果实上生有黑斑块,边缘有时腐烂,应为冬珊瑚黑斑病或称黑痂病,此病多发生在夏秋间,冬春发病很可能是属病斑较轻,暖冬造成表现轻迟,北京地区多为温室或室内养植,通风不良、湿度过高均将导致发病。被害植株当年生植株抗病性强,发病率低,两年以上植株则发病率高。我 1 Qilin, Guangxi Q: Ji Qingguo fruit students have black spots, is the disease? How to prevent? A: Jiqing fruit fruit students have black spots, the edge sometimes decay, should be the winter coral black spot or black Scab, the disease occurs in summer and autumn, the incidence of winter and spring is likely to be a lesion is lighter, resulting in mild late in the winter, mostly in Beijing greenhouse or indoor cultivation, poor ventilation, high humidity will lead to the disease. Victims of plant resistance in the current year strong, low incidence, more than two years the incidence of plants is high. I