河南省小麦纹枯病菌对三唑酮的敏感性

正小麦纹枯病是一种世界分布的土传真菌病害。近年来该病在我国冬小麦种植区发生普遍,已成为小麦高产、稳产的重大障碍~(1])。河南省是我国小麦主产区之一,近几年小麦纹枯病的发生面积连续在300万hm~2左右,危害严重~(2])。目前,尚未发现高抗纹枯病的小麦品种,控制该病害主要依靠药剂种子处理结合春季喷雾来进行,所用药剂包括井冈霉素和以三唑酮为代表的三唑类化学药剂。随着

Sensitivity of Rhizoctonia cerealis to triadimefon in Henan Province

In order to detect the sensitivity of Rhizoctonia cerealis in Henan Province to triadimefon, two-hundred R. cerealis isolates were collected from 32 counties in 16 cities in 2013 and 2015, and their sensitivity to triadimefon was determined in vitro by mycelial growth rate method. The isolates collected from different regions showed different sensitivities. However, most isolates collected from different years in the same region had the same sensitivity. Though there had appeared the isolates which showed decreased sensitivity to triadimefon in the field, the frequency was very low, which meant that triadimefon could still be used to control wheat sharp eyespot and the sensitivity to triadimefon should be monitored continuiously.