柠檬醛与戊唑醇混配对两种小麦土传病害的防病效果测定OA

To investigate the inhibitory effect of citral on wheat soil-borne fungal diseases and its potential for reduced pesticide use and enhance efficacy when mixed with tebuconazole,this study used Rhizoctonia cerealis,Fusarium graminearum,and F.pseudograminearum as test strains.By preparing citral microcapsules and using the mycelial growth rate method,the inhibitory activity of citral,its effect on sporulation of the pathogens,and the control efficacy of the mixed formulation against soil-borne diseases were determined.The results showed that the EC50 values of citral against R.cerealis,F.graminearum,and F.pseudograminearum were 31.66,80.81,and 129.36 mg/L,respectively,indicating strong antifungal activity.Citral at 0.15 mL/L completely inhibited the sporulation of both F.graminearum and F.pseudograminearum.When the dosage of tebuconazole was reduced by half and mixed with citral,the inhibitory effect was superior to that of tebuconazole alone.Compared with the control group,treatment with half-dose tebuconazole(0.2 mL/L)mixed with citral microcapsules reduced the incidence of soil-borne diseases caused by R.cerealis,F.graminearum,and F.pseudograminearum by 34.25%,41.66%,and 30.56%,respectively.These results indicate that citral has good inhibitory effects on wheat soil-borne diseases,and its mixture with tebuconazole can effectively control the disease occurrence while reducing chemical pesticide usage.This study provides an important reference for developing new natural fungicides for the management of wheat soil-borne diseases.