龙眼煤烟病菌的种类很多,目前采集到的有:小刺盾炱菌,泽田刺盾炱菌,刺盾炱菌,在运输、销售期间,烂果率达30～50%。病原菌为藻状菌纲,拟疫霉属。菌丝在病叶或病果上越冬,翌春靠风雨传播。病菌多从果蒂侵入,在果皮表面发生不规则病斑,逐渐扩展,使整个果实变黑,果肉腐烂,有酸腐酒味,病果外表有白色霜状物。叶片受害先呈褪色小斑,后扩 There are many kinds of longan soot germs. At present, we have collected the following species: Sarcandra glabrata, Stenotrophomonas spironchii and Stenotrophomonas persicae. During the transportation and sales, the rotten fruit rate reaches 30-50%. Phytoplasma algae fungi, Phytophthora. Mycelium in the diseased leaves or fruit overwintering, the next spring spread by the wind and rain. Pathogens invade from the fruit peduncles, irregular lesions occur on the surface of the peel, gradually expanding, so that the whole fruit black, decayed fruit, acid decadent taste, the appearance of the disease fruiting white cream. The first leaf damage was faded small spots, after expansion