Comprehensive Control Effects of Qinongsu and Pure Herbal Extracts to Tobacco Bacterial Wilt

Field experiments were conducted to investigate the comprehensive control effects of Qinongsu and a pure herbal extracts with thiediazole copper to tobacco bacterial wilt. The results showed that, the control effect was remarkably, and average disease index decreased by 76.1%. To achieve the best effect, we should use the varieties with high bacterial wilt resistance, apply 600 g/ha Qinongsu, 600 kg/ha pure herbal exacts with thiediazole copper to leaves and roots, and apply 20 days after transplanting and in mid-July when bacterial wilt occurs frequently.