Control of stem end rot (Dothiorella dominicana) and other postharvest diseases of mangoes (cv. Kensington Pride) during short- and long-term storage
Keywords:Mango, Controlled atmosphere, Stem end rot, Dothiorella, Benomyl, Prochloraz, Lasiodiplodia, Postharvest storage
AbstractImmersion in hot water (52°C for 5 min) plus benomyl (Benlate 50 WP I g 1-1) provided good control of stem end rot on mangoes following inoculation with either Dothiorella dominicana Petrak et Cif. or Lasiodiplodia theobromae (Pat.) Griff. & Maubl. during storage for 14 days at 25-30°C. In the same storage conditions, prochloraz (Sportak 45EC), DPXH6573 (40EC), RH3866 (25EC) and calcium chloride did not control stem end rot (D. dominicana). During long-term storage in a controlled atmosphere - 5% O2, 2% CO2, 13°C for 26 days, followed by air for 11 days at 20°C - hot benomyl (as above) followed by prochloraz (45 EC, 0.55 ml I-1 , 25°C, 30 sec) provided effective control of stem end rot and anthracnose. The addition of guar gum to hot benomyl improved control of stem end rot in the combination treatment. Hot benomyl alone was ineffective. Other diseases, notably altenaria rot (Alternaria alternata) (Fr.) Kiessler) and dendritic spot (Dothiorella dominicana) emerged as problems during controlled atmosphere storage. A. alternata and dendritic spot were also controlled by hot benomyl followed by prochloraz. Penicillium expansum Link ex Gray, Botrytis cinerea Pers. ex Fr., Stemphylium vesicarium (Wallr.) E. Simmons and Mucor circinelloides van Tieghem are reported as postharvest pathogens of mango, cv. Kensington Pride, for the first time.