Etiology and control of "bugtok" [bacterioses] disease on candaba banana [Philippines]
1986
Garcia, A.S. (Bureau of Plant Industry, Region 11, Bago-Oshiro, Davao City (Philippines). Regional Crop Protection Center)
Survey of "Bugtok" disease in Mindanao [Philippines] revealed that the disease is widespread and destructive reducing yield from 26.61 to 38.53 percent and a threat to cooking banana production in the country. Examination of 25 diseased plants indicated that symptoms were restricted in the shrivelled ovule, pulp of the fruit and in the vascular systems of the loculus, pedicel and aerial stem. Pure culture of the bacterium consistently isolated from infected tissues when artificially inoculated to healthy plants produced typically "bugtok" symptoms. The causal organism was named Pseudomonas solanacearum E.F. Smith. The pathogen gained entry at the tip of the ovary, through the cavities from the micropyl leading to the ovule and becoming systemic invaded the vascular system of the pedicel and aerial stem. Plants were susceptible to infection at flowering period during the female phase. The pathogen was not seedpiece borne but diseased fruits were found to be infective. A seasonal fluctuation on the incidence of the disease was recorded with no incidence in some months. This could possibly be brought about by the absence or reduced number of insects carrying the pathogen and sources of inoculum. Bagging and periodic removal of dried leaves showed significant reductions of diseased bunches after three years of control experiment.
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