4种常用杀菌剂对江苏省番茄枯萎病菌的毒力

Toxicity of four common fungicides to tomato Fusarium wilt in Jiangsu Province

采用菌丝生长速率法测定了4种杀菌剂对36株番茄枯萎病菌(Fusarium oxysporum)的毒力。结果表明,不同杀菌剂对番茄枯萎病菌的毒力水平有显著差异,25%氰烯菌酯悬浮剂和50%多菌灵可湿性粉剂对菌落生长的抑制毒力最强,EC50分别为1.65μg/mL和2.91μg/mL;3%中生菌素可湿性粉剂的毒力次之,EC50为12.56μg/mL;75%百菌清可湿性粉剂的毒力最小。不同地区的番茄枯萎病菌对4种杀菌剂的敏感性存在明显的差异,铜山地区的菌株除了对多菌灵、氰烯菌酯有较高的敏感性外,对其他2种杀菌剂都呈不同程度耐药性;沭阳地区的菌株对4种杀菌剂的敏感性均很强;姜堰地区的菌株对百菌清有较弱的敏感性,对其他3种杀菌剂的敏感性均较强。本研究为化学防治番茄枯萎病、科学合理用药提供参考依据。

The inhibitory activity of 4 fungicides against 36 Fusarium oxysporum, the pathogen of tomato Fusari- urn wilt, was investigated by mycelium growth rate method. The results showed that different fungicides have cer- tain inhibition effects on the growth of F. oxysporurn. 25% JS399 - lg SC and 50% carbendazim WP had the high- est inhibitory activities, with the EC50 values of 1.65 μg/mL and 2.91 /~g/mL, respectively, followed by 3% zhongshengmycin WP with EC50 value of 12.56μg/mL, and 75% daconil WP was the weakest. Moreover, patho- gens collected from different regions showed significant difference on the sensitivity to the four fungicides. The pathogens from Tongshan District were sensitive to carbendazim and JS399 - 19 but fairly resistant to the other 2 fungicides. Pathogens from Shuyang District were highly sensitive to the 4 fungicides. Pathogens from Jiangyan District had low sensitivity to daconil, but very sensitive to the other 3 fungicides. This study provides an impor- tant theoretical and practical basis and reasonable selection of fungicides for the control of tomato Fusarium wilt.