防治烟草靶斑病药剂的筛选

为了筛选出对烟草靶斑病防治效果好的药剂,选用70%甲基硫菌灵等15种不同的药剂对烟草靶斑病进行了室内抑菌试验和田间药效试验。室内抑菌试验通过生长速率法和抑菌圈法测定各种药剂对烟草靶斑病菌的抑制作用,结果表明:30%苯甲·丙环唑EC(爱苗)、20%噻氟酰胺SC(满穗)等13种药剂对烟草靶斑病菌的抑制效果较好,可用于田间药剂防效试验。在辽宁丹东的田间药效试验结果表明,8种药剂对烟草靶斑病的相对防效在50%以上,其中30%苯甲·丙环唑EC(爱苗)和20%噻氟酰胺SC(满穗)的防治效果最为理想,且持效时间长,第1次施药7 d后对烟草靶斑病的相对防效分别为46.71%和46.56%,第2次施药7 d后的相对防效分别达到76.95%和72.33%。可见,这2种药剂适合于丹东地区防治烟草靶斑病。

Screening of Fungicides for Control of Tobacco Target Spot

In order to screen out the suitable fungicides to control tobacco target spot,the laboratory test and field test were carried out to determine the control effect of 15 different fungicides on tobacco target spot in Dandong. The laboratory test showed that 30% difenoconazole propiconazole EC, 20%thifluzamide SC and other 11 fungicides were suitable for field test,which had a certain inhibition effect on the pathogen of tobacco target spot. The results of the field test indicated that the relative control effects of eight fungicides against tobacco target spot were more than 50%, in which 30% difenoconazole propiconazole EC and 20% thifluzamide SC were better than other fungicides. On the 7th day after applying the two fungicides for the first time, the relative control effects on tobacco target spot were 46. 71% and 46. 56%,when applying them for the second time,the relative control effects could be 76. 95% and 72. 33% on the 7th day,therefore they were suitable for controlling tobacco target spot disease in Dandong area.