小麦茎基腐病发生趋势预报及药剂防治试验

Occurrence Forecast and Fungicide Treatments of Wheat Basal Rot

小麦茎基腐病在陕西南部麦区发生越来越严重,已对小麦生产构成威胁。以小麦茎基腐病病株率作为预报量,小麦播期、11月高于0℃的积温、1～2月份逐日温度之和、3月上中旬逐日温度之和与3月份的雨量作为预报因子,运用模糊综合决策方法建立了小麦茎基腐病发生趋势预测模型;药剂防治试验结果表明:50%甲基托布津WP、25%多菌灵WP和50%苯菌灵WP在茎基腐发病初期喷雾,防效均在75%以上。

Occurrence and harm of wheat basal rot has recently become more and more serious in southern Shaanxi,and posed serious threat to wheat production.A forecast model of wheat basal rot was established with this paper using a method for synthetic decision of fuzzy mathematics.The incidence was predicted value.The prognostic factors had time of sowing,accumulated temperature was higher than 0 ℃ in November,accumulated temperature of January to February,accumulated temperature that the first twenty days of a month in March, and rainfall in March. Fungicide treatment resuhs showed that the control effects of thiophanate-methyl 50% WP, carbendazim 25% WP and benomyl 50% WP were all above seventy-five percent when the treatment time in disease primary.