刺梨白粉病的发生发展及其防治试验

Studies on the Occurence, Development and Control of Rosa roxburghii Powdery Mildew

摘要: 刺梨(Rōsa rōxburghii Tratt.)是一种灌木果树,果实中维生素C含量很高,具很高的经济、观赏价值1。近年来,在陕西省汉中、商洛地区大面积人工栽培刺梨,在栽培区普遍发生白粉病(Sphaerotheca pannosa(Wallr.)Lev)2,3,危害新梢、蕾、花和幼果,造成减产,严重时新梢枯死。目前,国内外对此病的研究报道甚少4。为此,于1988～1990年对该病的危害和病原菌的形态、发生发展规律及防治措施进行了研究。

Abstract: Powdery Mildew of Rosa roxburghii Tratt.is caused by Sphaero-theca pannosa (Wallr.) Lev.,cleistothecium has not been yet discovered in Xian.Hypha overwinters in the bud scale as primary infection source.Conidia are disseminated by wind.The incubation period is about 4~5 days.The disease occurs in the middle of April,2 peaks of the disease occur in May~June and September~October.The factors affecting the disease occurence are temperature and relative humidity.The disease can be controlled by 25% Triadimefon.Chemicals such as 50% Topsin,Antimycin 120 and Antibiotic Bo-10 also showed a certain degree of control efficiency.