Mango stem end rot management with carbendazim.
Bhatt H. R., Jadeja K. B.
Author Affiliation: 'Avadh' Block-A/22, Janakpuri Society, Zanzarda Road, Junagadh 362 001, India.
Indian Phytopathology 63 : 103-105
Abstract : Field and laboratory studies were conducted in Gujarat, India, in 2005, to determine the efficacy of carbendazim against Lasiodiplodia theobromae in mango. Carbendazim was tested on the growth inhibition of L. theobromae on mango cv. Kesar fruits along with the systemic fungicides propiconazole, triadimefon, thiophanate-methyl, tridemorph, hexaconazole, difenoconazole and fosetyl and 5 mixed formulations (carbendazim + copper oxychloride, iprodione + carbendazim, mancozeb + carbendazim, cyamoxanil + mancozeb and mancozeb + metalaxyl) at 250, 500, 750 and 1000 ppm. Two concentrations of carbendazim (0.025 and 0.05%) were also tested against L. theobromae as pre- and post-inoculation treatments on unripe mango cv. Kesar fruits. Spot application of carbendazim for natural infection management of harvested mango cv. Kesar fruits and pre-harvest application of carbendazim for fruit rot management were also conducted. Results showed that carbendazim was the most effective and produced 100% inhibition at all the concentrations, while propiconazole, triadimefon and thiophanate-methyl exhibited 100% inhibition at 1000 ppm. Among the 5 combinations tested, carbendazim + copper oxychloride, mancozeb + carbendazim and iprodione + carbendazim gave 100% inhibition at all concentrations. The pre-inoculation treatment of carbendazim at 0.05% completely controlled the stem end rot, while the lower conccentration resulted in 97.90% disease reduction. The disease intensity was higher when carbendazim was applied as a post-inoculation treatment. Spot application of carbendazim (0.025%) on the stem end region of the fruits produced 57.4% reduction in the natural incidence of stem end rot. The fruits harvested with pedicel and immediately removed from the orchard remained free from stem end rot even in the unsprayed control. The non-pedicelate and field-exposed fruits showed no incidence of stem end rot in the carbendazim treatment, while rot was recorded in the unsprayed control.