油茶为山茶科灌木或小乔木,是浙西淳安等县生产食用油的主要油料作物之一。油茶煤污病是油茶的一种常见病害,多发生在海拔较高的山区,多由蚧壳虫和蚜虫传播诱发。每年3~6月为盛发期,盛夏气温升高后停止扩散,9月下旬至11月为第二次发展期。1·症状初期叶面出现蜜汁粘滴,渐形成圆 Camellia Camellia shrubs or small trees, is the western Zhejiang Chunan county production of edible oil, one of the main oil crops. Camellia coal smut is a common disease of Camellia, occurred in the higher mountainous areas, mostly by scale insects and aphids spread induced. From March to June every year, it is the Shengfa period and the mid-summer temperature stops spreading. The second period of development is from late September to November. 1 · Symptom Appears honey sticky droplets on the foliar surface, gradually forming a circle