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噻呋酰胺240k/L悬浮剂13mL/667m2、嘧茵酯250k/L悬浮剂40mL/667m2对水稻纹枯病病指防效分别为98.4%、97.0%,显著优于其它各药剂防效;丙环唑25%乳油45mL/667m2、己唑醇50%水分散粒剂l0g/667m2病指防效分别为88.1%、84.9%;井冈霉素5%水剂200mL/667m2、咪鲜胺25%乳油80mL/667m2防效最差,分别为44.4%、37.0%.因此,噻呋酰胺、嘧菌酯对水稻纹枯病具有良好的预防及治疗效果,且对水稻生长安全,水稻纹枯病重发年份首选使用;丙环唑、己唑醇是取代井冈霉素的优良药剂,生产上可加以推广. 相似文献
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丛枝菌根真菌对黄瓜立枯病的影响 总被引:1,自引:0,他引:1
采用盆栽试验研究了接种丛枝菌根真菌(Glomus versiform)对黄瓜立枯病及抗病相关酶活性的影响。结果表明,黄瓜接种丛枝菌根真菌可显著促进黄瓜生长,并能显著抑制立枯病的发生,相对防治效果达67.1%,并可诱导黄瓜根系苯丙氨酸解氨酶、β-1,3-葡聚糖酶和几丁质酶3种抗病相关酶的活性,激活植物早期防御反应。 相似文献
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廖新光 《湖南农业大学学报(自然科学版)》1990,(1)
1984~1986年从田间采集的具有典型纹枯病症状的水稻、玉米、大豆、花生、小麦和立(木占)症状的棉苗等作物上分离的12个丝核菌菌株,从病菌无性时期的形态、细胞核、培养性状、菌丝亲和力、交互接种等诸方面进行了比较研究,结果表明,这些菌株均符合Darmeter等1965年所叙述的R.solani的形态特征,且幼龄菌丝中细胞是多核的,应视为同种,但不同寄主上的菌株在培养性状、菌丝亲和力、交互接种的感病情况仍存在一定差异,可视为不同类群,根据试验结果,初步提出了湖南上述作物水旱轮作换茬的种类布局,为栽培措施防病提供依据。 相似文献
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新疆棉花主栽品种对2种棉花苗期病害抗性分析 总被引:3,自引:3,他引:0
【目的】 研究新疆当前棉花主栽品种对红腐病和立枯病的抗性,为病害的高效防控提供依据。【方法】选用拟轮枝镰孢霉和立枯丝核菌新疆菌株,通过人工接菌条件下的室内盆栽鉴定和田间小区试验,分析新疆20个棉花主栽品种对红腐病和立枯病的单一抗性水平和兼抗水平。【结果】大多数棉花品种对2种病害存在显著或极显著的抗性差异;供试品种中没有表现为免疫或高抗的品种,多数品种对2种病害表现为感病或高感,仅有少数品种对红腐病或立枯病表现为抗病或中抗;对红腐病表现为抗病的有中棉72号和新陆早53号,表现中抗的有中棉50号、新陆早57号和新陆早61号等5个品种;对立枯病表现为中抗的有新陆早53号、中棉72号和中棉50号等6个品种;对2种病害的兼抗性表现为中抗的有新陆早53号、中棉72号和中棉50号等6个品种。【结论】当前新疆棉花主栽品种中,对红腐病和立枯病均存在显著的抗性差异,缺乏对红腐病和立枯病高度抗病品种;对2种病害的抗性存在一定程度的关联,对立枯病表现为中抗的品种多数兼具对红腐病的抗性。 相似文献
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One hundred and thirty five isolates of Rhizoctonia solani were obtained from British potato crops between 2001 and 2003. Isolates were assigned to anastomosis group (AG) using conventional PCR assays for AG2-1 or AG3 or through the observation of hyphal interactions, where appropriate. A previously published primer set was modified in this study to enhance specificity for AG3PT. Most of the isolates (92·6%) belonged to AG3PT whilst some (6·7%) belonged to AG2-1. Only one isolate recovered (0·7%) belonged to AG5. Isolates of AG2-1 were diverse, with variation in both the length of the rDNA intergenic spacer 1 (IGS1) region and the categories of hyphal interaction observed between pairings of AG2-1 isolates. No variation in the length of the rDNA IGS1 region was observed amongst the AG3 isolates collected. Tests carried out on potato stems with a sub-set of the isolates revealed a wide range of aggressiveness amongst AG2-1 isolates. Sequencing of the rDNA internal transcribed spacer (ITS) region of the AG2-1 isolates and construction of a neighbour joining tree with other AG2-1 sequences available indicated that AG2-1 isolates with the short IGS1 region were closely related. This is the first investigation which provides evidence of the relative AG composition of R. solani populations causing disease in potato crops in Great Britain. 相似文献