除草剂胁迫下小麦雪腐病发生的生态研究

 3年田间试验表明,扑草净、使它隆有促进小麦雪腐病(Gerlachia nivalis)的作用,而阔叶净无影响;三种除草剂均抑制纹枯病(Rhizoctonia cerealis)发生,且作用相对独立于对雪腐病的影响.扑草净对雪腐病的促进在于提高生长时期初次侵染,其关键生育期为第一真叶前,但不改变病害发展的内在速率.因此,扑草净是使病害发生更早而非更快.

Studies on the Ecology of the Occurrence of Wheat Snow Rot Stresse by Herbicides

In accordence with some data collected in three crop seasons from 1991～1992,1992～1993 and 1993～1994,demonstrated that both Prometryn and Fluroxypyr inducd sonw rot(Gerlachia nivalis) but DPX-L5300 Express did not,and all of them reduced sharp eyespot(Rhizoctonia cerealis) which was independent of the fomler,in Sichuan Province.With the evidences again,primary infections of snow rot by was promoted Prometryn only when the earliest growing period of wheat and with asensitive term before the on-foliage stage, but not altered the natural increasing rate of the disease yet,which indicated that Prometryn made more earlier but not faster infections.