Postharvest disease control in mangoes using high humidity hot air and fungicide treatments.
Coates L. M., Johnson G. I., Cooke A. W.
Author Affiliation: Division of Plant Protection, Department of Primary Industries, Meiers Road, Indooroopilly, Qld 4068, Australia.
Annals of Applied Biology 123 : 441-448
Abstract : The disease control efficacy of quarantine heat treatments (high humidity (>95% R.H.), hot air (HHHA) at temp. ranging from 47-49°C) were evaluated. Anthracnose, caused by Colletotrichum gloeosporioides [Glomerella cingulata], was controlled by heating mangoes to a core temp. of 46°, 47° or 48° for 24, 10 or 8 min respectively, prior to ripening at 23° for 16 d. Stem end rot, caused by Dothiorella dominicana and Lasiodiplodia [Botryodiplodia] theobromae was not controlled by these treatments. During storage at 23°C for 15 d, the incidence of stem rot was reduced by HHHA (core temp. of 47°) alone, although immersion in hot benomyl (0.5 g a.i./litre at 52° for 5 min) either before or after HHHA treatment improved stem end rot control. HHHA treatment (core temp. of 46.5° for 10 min) alone reduced the incidence of anthracnose in mangoes stored at 13° for 14 d prior to ripening at 22°, although a combination treatment consisting of HHHA and either hot benomyl or unheated prochloraz gave complete control of anthracnose under these storage conditions. HHHA treatment alone gave no control of stem end rot in mangoes stored at 13° prior to ripening at 22°. A supplementary hot benomyl treatment was required for control of this disease in cool-stored mangoes. The development of yellow skin colour in the fruit was accelerated by HHHA treatment.