数种农药对蚕豆根腐病的田间防效

在实验室内探讨了三唑酮，甲基硫菌灵，福美双，恶霜灵和甲霜灵等5种杀菌剂单用或混用对蚕豆种子萌发和幼苗生长的影响，据此，在田间开展了杀菌剂拦种和杀菌剂与杀虫剂混用防治蚕豆根腐病的研究，第1年的结果表明，在11个处理中，三唑酮单独拌和效果最为显著，与对照相比，在0.01ga.i.kg^_1种子的剂量下，使6周龄植株的根腐病指数降低51.5%，成株累计死亡率减少36%，单株种子产量提高21%，每公顷种子产量增加97.6%，其他处理未取得显著防效，第2年开展的三唑酮拌种是防治蚕豆根腐病的有效措施之一。但杀菌拌种应与其他防治措施综合应用，方可取得更好的防治效果。

Effect of pesticides on field-controlling root rot of Vicia faba

The effect of pesticides on field-controlling root rot of Vicia faba was studied in two consecutive years by seed treatment of fungicides and their combination. The results of the first year field experiments showed that among the 11 treatments tested, triadimefon of 0.01 g a.i.kg-1 seeds was more effective than other fungicides applied singly or in combinations. The other test fungicides included thiophanate-methyl, thiram, oxadixyl and metalaxyl. Compared to the control, triadimefon treatment reduced the root rot index of 6-week-old seedlings by 51.5%, and plant accumulated percent mortality by 36%. Consequently, the treatment increased seed yield/plant by 21% and seed yield/ha by 97.6%. In the trials carried out in the following year, the plant percent mortality was reduced by 31.9% and seed yield increased by 19.6% under triadimefon seed treatment. It is demonstrated that seed treatment by triadimefon effectively controlled root rot, promoted plant growth, and increased seed yield of faba bean in the fields.