Effect of soybean oil in the control of anthracnose and on post-harvest conservation of mango, cv. Palmer.
Junqueira N. T. V., Nascimento A. C. do, Ramos V. H. V., Lage D. A. da C., Krahl L. L., Almeida D. A., Cabral G. de A.
Author Affiliation: Embrapa Cerrados, BR 020, Km 18, Rod. Brasília/Fortaleza, Caixa Postal 08223, CEP 73310-970, Planaltina, DF, Brazil.
Boletim de Pesquisa e Desenvolvimento - Embrapa Cerrados : 14 pp.
Abstract : Several postharvest diseases infect mango fruits, but anthracnose (Colletotrichum gloeosporioides [Glomerella cingulata]) is the most important. This disease has been controlled by fruit immersion for five minutes in water at 55°C containing 0.2% thiabendazole. Although efficient in the control of mango anthracnose, this fungicide leaves residues that are undesirable to consumers who want pesticide-free fruits. Experiments were carried out to select biological and chemical products to control postharvest anthracnose and to increase the mango shelf life. Mango fruits were harvested in the third and fourth ripening stages, immersed for five minutes in water (control), benomyl (100 g/100 litres), thiabendazole (240 g/100 litres) at 22, 40 or 45°C and in different concentrations of soyabean oil alone or combined with benomyl, thiabendazole and ethanolic extracts of sucupira fruit (Pterodon pubescens). After treatment the fruits were maintained in room conditions at 27±1°C, RH=72-85% (experiment 1) and at 17±1°C, RH=85-100% (experiment 2). Evaluations were made at 15 days (experiment 1) and 30 days (experiment 2) after the treatment by percentages of the fruit area with lesions, ripe, half-ripe and unripe fruits, Brix and texture. Soyabean oil alone or with benomyl or thiabendazole at 22 or 40°C increased mango shelf life and was efficient in the control of anthracnose.