Quick decline of mango and in vitro response of fungicides against the disease.
Arshad Mahmood, Gill M. A.
Author Affiliation: Plant Pathology Section, Ayub Agricultural Research Institute, Faisalabad, Pakistan.
International Journal of Agriculture and Biology 4 : 39-40
Abstract : Diseased samples including root and bark from collar portion of the quick decline affected mango plants were collected from Punjab, Pakistan. Fusarium oxysporum and F. solani were isolated from the root samples of old diseased plants; whereas, freshly affected plants yielded Fusarium sp. in lower frequency. Botryodiplodia theobromae was isolated from the bark samples. Inoculations with pure culture of B. theobromae to the mango seedlings caused 86.7% mortality, which confirmed the cause of quick decline. In vitro effect of fungicides (Topsin-M [thiophanate-methyl], Benlate [benomyl], Daconil [chlorothalonil] and Cuprocuffaro [copper oxychloride] at 10, 20, 50 and 100 ppm concentrations) on the mycelial growth of B. theobromae revealed Topsin-M and Benlate to be effective even at 20 ppm and 100 ppm, respectively. Cuprocuffaro was the least effective fungicide against the fungus at all concentrations.