【摘要】 大丽花白粉病是大丽花栽培中的重要病害。病原菌以菌丝体在病残体上越冬 ,借气流和风传播 ,以分生孢子扩大再侵染。病原菌为真菌寥白粉菌 (Erysiphe polygoni DC) ,药剂防治宜在移栽后 1个月进行 ,隔 7d喷 1次 ,共 2次。试验表明 :各药剂间的防效差异显著 ,以 2 %的石硫合剂和 50 %的退菌特 80 0倍液的效果最佳。更多还原

【Abstract】 Powdery mildew is a serious pest in Dahlia.Pathogeny can survive the winter in disease remaining by hyphae form, spread by airflow and wind, enlarge infection by conidium. Its scientific name is Erysiphe polygoni DC. Germicide protection is correctly done after its transplantation for one month, sprayed continuously twice at intervals of 7 d. It is experimentally indicated that there is remarkable diversity among individual germidides, 0.5% Lime sulphur and 50% Tuzet is superior.更多还原