Fungicide management and fruit bagging for effective control of fruit rot of `Carabao' mango (Mangifera indica L.) caused by Colletotrichum gloeosporioides Penz.
2003
Baniqued, M.G.B.
Field experiments were conducted in three mango orchards in Mindanao [Philippines]. In four screening trials, the four protectant and four systematic fungicides applied at 10-day intervals starting from 35 DAFI [days after flower induction] up to fruit maturity, significantly reduced the incidence and severity of mango fruit rot, 7 days after harvest. The degree of control of fruit rot afforded by the protectant fungicides ranged from 42-70% on incidence and 69-94% on severity while those by the systematic fungicides ranged from 46-89% on incidence and 95-98% on severity. Under high disease pressure, spraying either mancozeb or azoxystrobin at 7-, 0-, and 14-day spray intervals significantly protected mango against fruit rot. Mancozeb should be applied at least four times at early fruit development (35-75 DAFI) to give 53% control of fruit rot incidence and lower disease severity by 83%. Application of azoxystrobin one or two times provided acceptable fruit protection but three-time applications during fruit development could achieve 95-99.6% fruit rot control. In contrast, five sprays of mancozeb can only achieve 50-75% control. Azoxystrobin is 44% more expensive in these levels of applications, but this is compensated by giving added control efficacy. Under low disease pressure (ECJ Farms), two sprays of mancozeb provided acceptable level of protection. Fruit bagging experiment failed to demonstrate the significant effect of the time of fruit bagging, bagging materials and dimension on the incidence and severity of fruit rot and stem-end rot
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