朱顶兰红斑病的研究 (Ⅲ)发病规律及防治

Studies on the Red spot of Amaryllis vittata (Ⅱ): Disease Occurrence and Chemical Control

朱顶兰红斑病病菌〔Stagonospora curtisii(Berk)Sacc.〕在患病组织内越冬,于3月上旬开始初次侵染,而后病菌进行重复侵染。病害发生期为3～11月,病害的发生与温度、湿度、降水量和雨日有关,在诸因子中以与雨日的关系最为密切。因此梅雨季节和秋雨季节是该病的发生高峰期。朱顶兰的被害程度不但与品种有关,而且与栽培环境有关。根据室内抑菌测定和圃地防治试验,ZHB(自己混合配制药剂),四氯苯酞、百菌清、三环唑等杀菌剂,对该病具有良好的防治效果。如采用综合防治措施,其防治效果更佳。

Studies showed that the pathogen Stagonospora curtisii of red spot overwintered on the diseased plant untill primary infection occured in early March. The conidia could infect plants again and again before November. High rainfall, long rainy days, warm and moist conditions were favorable to the infection of the disease. Invasion peak emerged in the rainy season. Susceptibily to the disease was quite different among the varieties,in which Amaryllis hybridus was the most disease-resistant. Disease incidence was colsely ralated to cultivative environment. Chemical control showed that ZHB (a kind of mixed fungicide), chlorothalonil, phthalide, tricyclazole and ziram were effective fungicides for this disease.