Control of blue mold (Penicillium expansum) by fludioxonil in apples (cv Empire) under controlled atmosphere and cold storage conditions

摘要

A reduced risk fungicide,fludioxonil,was tested for its efficacy against blue mold caused by thiabendazole-resistant and -sensitive Penicillium expansum (Link) Thorn in apples under three storage conditions.In a co-treatment,fludioxonil and inoculum were applied together to test the protective activity of the fungicide on wounds that had been aged for 1 or 2 days.The fungicide was also tested for its curative activity in post-inoculation treatment on apples that had been inoculated for 1 or 2 days.Fludioxonil was very effective as co-treatment and as post-inoculation treatment.At a concentration of 300 mg litre~(-1),fludioxonil gave complete control of post-harvest blue mold caused by the thiabendazole-resistant and -sensitive P expansum for 105 days in controlled atmosphere (CA) storage at 2 (±1) deg C,for 42 days in common cold storage at 4 (±1) deg C and also in a shelf-life study for 6 days at 20 (±1) deg C.Comparison on the effect of fludioxonil in CA storage and common cold storage showed that higher concentrations of fungicide were needed in cold storage than in CA storage.Fludioxonil at a concentration of 450 mg litre"1,gave 98 and 92% control of blue mold of apples in the simulated shelf-life studies after CA and common cold storages,respectively.Fludioxonil has a potential to be incorporated in the fungicide resistance management strategies for control of blue mold in apples stored for 105 days.