7种杀菌剂防治番茄白粉病药效评价及应用

为评价7种杀菌剂对番茄白粉病的防治效果,2015—2016年开展了田间小区试验。试验结果表明:在推荐剂量下,430 g/L戊唑醇SC、10%苯醚甲环唑WG、25%嘧菌酯SC和250 g/L吡唑醚菌酯EC对番茄白粉病均具有良好的防治效果,显著优于29%吡萘·嘧菌酯SC、43%氟菌·肟菌酯SC和42.4%唑醚·氟酰胺SC。430 g/L戊唑醇SC和10%苯醚甲环唑WG的持效期长于其它药剂。针对番茄白粉病的发生和流行特点,当田间发现该病害时,可及时采用持效期长的杀菌剂喷施,施药2~3次,间隔期10 d左右。

Efficacy Evaluation and Application of Seven Fungicides Against Tomato Powdery Mildew

In order to evaluate the control effects of seven fungicides, the trials were carried out in 2015-2016. The results showed that tebuconazole 430 g/L SC, difenoconazole 10% WG, azoxystrobin 25% SC and pyraclostrobin 250 g/L EC had good efficacies against tomato powdery mildew with recommended dosage in the two years field trials. And the efficacies of the above-mentioned fungicides were significantly better than isopyrazam + azoxystrobin 29% SC, fluopyram + trifloxystrobin 43% SC and pyraclostrobin + fluxapyroxad 42.4% SC. Meanwhile, the persistent periods of tebuconazole 430 g/L SC and difenoconazole 10% WG were longer than the others. According to the occurrence and epidemic characteristics of tomato powdery mildew, fungicides are used in early period of tomato powdery mildew by spraying two or three times, and the interval time is 10 days.