3种杀菌剂拌种防治向日葵黑茎病药效试验研究

Field Trials of Three Kinds of Seed Dressing Fungicide for Controlling Sunflower Black Stem

进行了3种杀菌剂对向日葵黑茎病的拌种药效试验,结果表明,3种药剂拌种后对向日葵出苗安全,不产生药害;各个处理的防效均随着向日葵生育进程的推进而下降,以出苗后35 d防效最为理想,此时2.5%咯菌腈FS 11.25 mL/hm2、2.5%咯菌腈FS 9 mL/hm2和50%多菌灵WP 13.5 g/hm2的防效为71.7%～83.4%,显著高于50%多菌灵WP 9 g/hm2、70%甲基硫菌灵WP 13.5 g/hm2和70%甲基硫菌灵WP 9 g/hm2,经方差分析证明处理间差异达到显著水平。

The field trials of three kinds of fungicide against sunflower black stem were carried out by seed dressing.The results showed that three kinds of seed dressing fungicide were safe for seed emergence of sunflower and their control effects decreased with the promotion of sunflower growth stages.A satisfying efficacy was obtained at 35 d after emergence.At the moment,the effects of fludioxinil 2.5% FS at 11.25 mL/hm2 and 9 mL/hm2 and carbendazim 50% WP at 13.5 g/hm2 were 71.7%-83.4%,obviously better than that of thiophanate-methyl 70% WP at 13.5 g/hm2 and 9 g/hm2 and carbendazim 50% WP at 9 g/hm2.The variance analysis showed significant differences between treatment levels.