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刺梨白粉菌(Sphearotheca sp.)以分生孢子和菌丝体在幼苗的新鲜病叶上越冬,成为来年的初侵染菌源。未发现有性世代。刺梨白粉病于4月上中旬始发,5月是花蕾和幼果的发病盛期,6月是叶片的发病盛期,7月以后病情下降。病害的流行程度与新叶的增长量呈显著正相关。发病较适条件:温度15—28℃,相对湿度80％以上,日照每天4小时左右。病害始发期用粉锈宁防治的防效达77％以上。
Spirilotheca sp. Was overwintering on the fresh leaves of the seedlings with conidia and mycelia, becoming the primary source of infection in the coming year. No sexual generation found. Prickly pear powdery mildew onset in mid April, May is the buds and young fruit peak incidence, June is the peak incidence of leaves, after July decline. Disease prevalence and new leaf growth was significantly positively correlated. More appropriate conditions onset: temperature 15-28 ℃, relative humidity 80%, sunshine 4 hours a day or so. The onset of disease with triadimefon prevention and control of more than 77% control effect.