Heat treatment of Colletotrichum gloeosporioides Penz in mango (Mangifera indica).
Rondón O., Albarracín N. S. de, Rondón A.
Author Affiliation: Instituto Nacional de Investigaciones Agrícolas, Estación Experimental Miranda, Miranda, Venezuela.
Manejo Integrado de Plagas y Agroecología : 76-79
Abstract : We carried out a laboratory assay to determine the optimum temperature and exposure time to avoid the development mango anthracnosis caused by C. gloeosporioides [Glomerella cingulata] in fruits of mango cultivars Haden and Tommy Atkins collected from a plantation in southern Aragua State, Venezuela. Five punctures were made in each fruit and the fungus was applied to the punctures to induce the disease. The fruits were maintained for 36 h in a wet chamber, then subjected to a hot water treatment (40±0.3, 45±0.3 or 50±0.3°C for 60 and 90 minutes). Observations were made every 3 days for 15 days at room temperature (26-28°C). We measured the diameter of the colonies around the punctures. The best treatment for controlling anthracnosis was the exposure to 50±0.3°C for 60 and 90 minutes, followed by 45±0.3°C for 90 and 60 minutes; exposure to 40±0.3°C for 60 and 90 minutes was not effective. The maximum inhibition of the fungus was obtained with temperatures of more than 45°C, indicating that exposure to 46.1°C for 60-75 minutes is optimum for controlling the disease.