引起江苏茅山地区宣木瓜叶斑病的病原鉴定

<正>原产于安徽省宣城市的地道中药材宣木瓜(Chaenomeles sinensis)隶属蔷薇科(Rosaceae),为常用中药木瓜的上品,是与藏红花、甘枸杞、川杜仲齐名的四大名贵中药材之一。除药用之外,近年也被用于化妆品和保健品领域[1]。此外,由于树冠优美、花团锦簇,宣木瓜还被栽培用于观赏;同时,因其耐旱耐瘠,对土壤要求不高,又常被作为退耕还林的引种树种。因此,宣木瓜是一种集经济、生态、社会等多种效益于一身的优良树种,被广泛种植于安徽、云     

芍药黑斑病病原菌鉴定及其对杀菌剂敏感性分析

对在江苏省扬州市芍药(Paeonialactiflora)叶片上发现的一种黑斑病,采集其病叶,分离和纯化病原物,根据柯赫氏法则明确其致病性。基于病原物形态特征和多基因(r DNA-ITS、endo PG、OPA2-1、Alt a 1)序列联合分析,鉴定该病原物为链格孢(Alternaria alternata)。该病原菌的最适生长条件是:温度为28℃,p H 7.0,最适碳源为可溶性淀粉,最适氮源为硝酸钾。室内毒力测定发现,在测试的4种杀菌剂中,嘧菌酯和吡唑醚菌酯乳油对病原菌离体生长的抑制作用较强,而戊唑醇和异菌脲对其生长的抑制作用较差。     

生物农药与化学农药复配对桃枝枯病菌的毒力

[目的]明确生物农药和化学农药复配对桃枝枯病菌的抑制效果。[方法]采用菌丝生长抑制法,测定10种生物药剂对桃枝枯病菌的毒力,将毒力强的生物农药与化学农药咪鲜胺、多菌灵和烯唑醇进行复配,探讨复配剂对桃枝枯病菌的联合毒力效果。[结果]毒力作用最强的生物农药是中生菌素,其次是申嗪霉素和梧宁霉素,其抑制中浓度(EC50)分别为0.041 9、0.231 4和0.655 4μg/m L,与3种化学药剂复配,发现申嗪霉素与3种化学农药复配均达到增效作用,而中生菌素和梧宁霉素与化学农药复配大多配比具有增效作用或相加作用。[结论]生物农药与化学农药复配能增加对桃枝枯病菌的毒力。     

引起江苏茅山地区宣木瓜叶斑病的病原鉴定

A new leaf disease on Chinese quince (Chaenomeles sinensis) was recently noted in Mount Maoshan, Jurong City, Jiangsu Province, China. Symptoms began with irregular lesions on tips or margins of the leaves, which gradually developed into concentric rings. The lesions eventually spread to cover one half or the entire leaf, leading to eventual desiccation and defoliation. Disease survey and responsible agent isolation was conducted in this study. Based on morphological characteristics, combined gene sequence analysis of ITS, G3PDH, HSP60 and RPB2, and Koch’s postulation, the causal agent of this new disease was identified as Botrytis cinerea.