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Poster: Biology & Disease Mgmt: Chemical Control


Control of apple rots caused by Phacidiopycnis washingtonensis, Phacidium lacerum y Diplodia seriata in postharvest in Chile
G. A (1), M. Caceres (1), M. Lolas (1), C. Pacheco (1), T. Daza (1) (1) Universidad de Talca, Chile

The apple rots caused by fungal species in pre-harvest and postharvest are an important problem for Chilean apple industry. Recently, we detected to Phacidiopycnis (Pha.) washingtonensis, Phacidium (P.) lacerum and Diplodia (D.) seriata associated with apple rot in pre-harvest and postharvest in Maule Region, Chile. The objective this study were determine i) to sensitivity in vitro to fludioxonil (phenyl pyrrole), pyrimethanil (aniline-pyrimidine) tebuconazole (DMI) and thiabendazole (benzimidazole), and ii) to reduce infection with fungicide applied prior to storage on apple cv. Cripps Pink. Apple fruits were protected with different fungicides and methods (fogging and drench), and after 24 h inoculated with each pathogen. All fruit were stored at 0°C for 60 d. The results indicate that the isolates of Pha. washingtonensis, P. lacerum and D. seriata were sensitive to all fungicides, obtaining differents EC50 values. Fludioxonil, pyrimethanil, and thiabendazole by thermo-fogging reduced significantly to infection during cold storage obtaining an efficacy of 75% to 96%. Fludioxonil and thiabendazole applied by drench reached between 84% and 100% of effectivity. Finally, fungicide applied prior to storage by fogging or drench can be an effective control of apple rots during cold storage in Chile