三种杀菌剂对小麦和秆黑粉病的作用

人工接菌种子,在重病地试验,以70％甲基托布津、25％多菌灵和25％粉锈宁,分别按种子重量0.1％,0.2％和0.3％拌种;在对照病茎率23.8％的情况下,粉锈宁的所有处理,0.2％和0.3％甲基托布津及0.3％多菌灵处理的防效都是100％,其它处理的防效也在95.9％～99.4％.在3种供试农药中,粉锈宁使小麦出苗期推迟,分蘖、有效穗数和产量受到影响,防治效益差,建议采用0.2％～0.3％甲基托布津或0.3％多菌灵拌种为好。

Effects of Three Systemic Fungicides Upon Wheat and Its Flag Smut

By artificial inoculating seeds, experiments were made in heavily diseased soil. 70% of thiophanata methyl, 25% of carbendazim and 25% of triadimefon were dressed on wheat seeds based on seed weight of 0.1%, 0.2% and 0.3% respectively. In the case of 23.8% of infected diseases in the control, effects of three treatments of triadimefon and treatments of 0.2% and 0.3% of thiophanata methyl as well as 0.3% of carbendazim were 100%; effects of other treatments were 95.9% to 99.4%. Among the three fungicides in the experiment, triadimefon resulted in emergence of seedlings late evidently, and tillers, effective spikes and yield reduction obviously. So it is sueggested that it be better to adopt 0.2%-0.3% of thiophanata methyl or 0.3% of carbendazim to dress on wheat seeds for controlling flag smut of wheat.