河南省小麦纹枯病菌及小麦全蚀病菌对丙环唑的敏感性

正小麦纹枯病和小麦全蚀病是河南省小麦生产上重要的土传病害,发病面积分别在300万和30万hm~2~([1,2])。近年来,由于小麦高产栽培措施(早播、密植、高肥)的推广,以及气候条件适宜、农机跨区作业等原因,两种病害的发生面积日益增大,

Sensitivity of Rhizoctonia cerealis and Gaeumannomyces graminsis isolates from Henan Province to propiconazol

The sensitivity of Rhizoctonia cerealis and Gaeumannomyces graminsis to propiconazol was determined by measuring the mycelial growth on the fungicide-amended media using 98 isolates of R. cerealis and 88 isolates of G. graminsis from Henan Province. The results indicated that 50% effective concentration (EC₅₀) values of R. cerealis and G. graminsis to propiconazol ranged from 0.119 3 to 2.581 3, 0.001 5 to 0.172 4 μg·mL^-1, respectively. The results of the frequency analysis revealed that low sensitivity subcolony to propiconazol had been discovered in R. cerealis and G. graminsis. The mean EC₅₀ values of (0.484 8±0.200 9) and (0.049 3±0.029 0) μg·mL^-1 for most isolates showed a unimodal curve distribution, which were treated as the sensitivity baseline of R. cerealis and G. graminsis to propiconazol, respectively. The isolates collected from different regions showed different sensitivities. The results provided a theoretical basis for the efficient application of propiconazol in the control of wheat sharp eyespot and take-all in the field of Henan Province.