防治花生腐霉果腐病的化学药剂筛选

花生果腐病是一种重要的土传病害,一旦发生会造成荚果腐烂落果,重病田可致绝收。群结腐霉菌(Py thium myriotylum)是引起花生果腐病最主要的病原菌。为寻找防治花生果腐病的有效药剂,本研究对6种化学药剂进行室内筛选,实验结果表明,96.8%的咯菌腈对引起花生果腐病的群结腐霉有较好的抑菌效果,EC50为3.16×10-5 mg/L,较低浓度的药剂就可以达到很好的抑制效果。盆栽接种后,用6种杀菌剂进行灌根,待荚果成熟后对病害发病情况进行调查统计,结果表明96.8%咯菌腈是防治花生果腐病最有应用潜力的药剂品种。

Fungicides screening for management of peanut pod rot caused by Pythium myriotylum

Peanut pod rot is one of the most important soil-borne diseases on peanut.It will cause pod rot,and the seriously affected field can lead to total crop failure.In recent years,Pythium myriotylum was identified as the main pathogen of peanut pod rot in the major peanut producing areas of China.In order to control this disease effi ciently,6 fungicides were screened indoors,the experimental results showed that 96.8%fludioxonil had best inhibi tory effect on mycelial growth of P.myriotylum.The EC50 value was 3.16×10-5 mg/L.The six fungicides were used for root irrigation,after potted seedlings inoculation,and the disease incidence was investigated after the pods rip ened.The results showed that 96.8%fludioxonil was the best potential chemical agent for preventing peanut pod rot.