噻呋酰胺与吡唑醚菌酯复配对马铃薯黑痣病联合作用及其田间效果

采用菌丝生长速率法测定噻呋酰胺与吡唑醚菌酯不同配比复配对马铃薯黑痣病菌的毒力,评价其联合作用,并选择最佳配比加工成制剂进行田间小区药效试验。试验结果表明:噻呋酰胺与吡唑醚菌酯以质量比3︰1、2︰1、1︰1、1︰2、1︰3复配,增效作用显著,其中以质量比1︰2复配,增效作用最佳,共毒系数为181.42。按此比例加工30%噻呋·吡唑酯悬浮剂,在有效成分用量为200~300 g/hm~2时地面喷雾,开花期、收获时对植株黑痣病和薯块黑痣病的防效分别为72.09%~75.58%和77.08%~80.80%。因此,30%噻呋·吡唑酯悬浮剂防治马铃薯黑痣病效果良好,且对马铃薯安全,有较高的推广应用价值。

Co-toxicity and Control Effect of the Mixture of Thifluzamide and Pyraclostrobin on Potato Black Scurf

The co-toxicity and cotoxicity coefficient (CTC) of the mixture of thifluzamide and pyraclostrobin against potato black scurf(Rhizoctoniasolani) were determined by the mycelial growth rate method. The control efficiency trial of the formulation were carried out in 2016. The results showed that the mixtures of thifluzamide and pyraclostrobin by mass ratio of 3:1, 2:1, 1:1, 1:2, 1:3 had synergistic effects on potato black scurf. The synergistic effect of the 1:2 mixture was the strongest, with CTC of 181.42. The control effects of thifluzamide + pyraclostrobin 30% SC 200-300 g/hm2 at the flowering stage and harvest time were 72.09%-75.58% and 77.08%-80.80%, respectively. Therefore, thifluzamide + pyraclostrobin 30% SC 200-300 g/hm2 could control potato black scurf effectively, and it was safe to potato. It had high value for application.