【摘要】 通过实地调查、室内分离培养和病原鉴定 ,发现郑州市草坪根部病害的病原菌主要是禾德氏霉 (Drechsleragraminea)、立枯丝核菌 (Rhizoctoniasolani)、镰刀菌 (Fusariumspp .)、腐霉菌(Pythiumspp .)等。选用 10种不同杀菌剂对草坪根病优势病原菌室内毒力测定结果表明 ,烯唑醇和敌力脱对禾德氏霉、立枯丝核菌均有强烈的抑制菌丝生长的作用 ,对禾德氏霉的EC50 均为0 0 3μg/mL ,EC90 分别为 0 2 5 μg/mL和 0 98μg/mL ;对立枯丝核菌的EC50 分别为 0 11μg/mL和 0 4 7μg/mL ,EC90 分别为 78 0 6 μg/mL和 3 97μg/mL。五氯硝基苯对丝核菌也有较强的抑制作用。福美双对镰刀菌抑制作用较强。在小区防治试验中 ,对草坪根部病害效果较好的是12 5 %烯唑醇WP 10 0 0倍液、 4 0 %棉花保苗剂WP 5 0 0倍液、 4 0 %五氯硝基苯WP 5 0 0倍液和2 5 %敌力脱EC 10 0 0倍液 ,防治效果均在 5 0 %以上更多还原

【Abstract】 Through investigation,isolation and identification,we found that the dominant pathogens of turfgrass root disease in Zhengzhou area were Drechslera graminea?Rhizoctonia solani?Fusarium spp..The virulence of 10 kinds of fungicides was tested to those pathogens,and the results indicated that diniconazole and propiconazole violently inhibited the hypha growth of Drechslera graminea and Rhizoctonia solani. Their EC 50 to Drechslera graminea were all 0 03 μg/mL,EC 90 were 0 25 μg/mL and 0 98 μg/mL respectively;Their EC 50 to Rhizoctonia solani were 0 11 μg/mL and 0 47 μg/mL,EC 90 were 78 06 μg/mL and 3 97 μg/mL respectively.PCNB and thiram inhibited violently Rhizoctonia solani and Fusarium sp,respectively.The plot test indicated that 12 5 % diniconazole WP 1 000×?40% cotton seedling protective formulation WP 500×?40% pentacide WP 500× and 25% propiconazole EC 1 000× had the better control effect to turfgrass root disease,the effects were all more than 50%更多还原