Etiology and control of "bugtok" disease on Cardaba banana
1985
Garcia, A.S. (Bureau of Plant Industry, Davao City (Philippines))
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 twenty five diseased plants indicated that symptoms were restricted in the shrivelled ovule, pulp of the fruit and in the vascular system at the loculus, pedicel and serial stem. Pure culture of the bacterium consistently isolated from infected tissues when artificially inoculated to healthy plants produced typically bugtok symptoms. The causal organisms was identified as Pseudomonas solanacearum E.F. Smith. The pathogen gains entry at the tip of the ovary, through the cavities from the micropyl leading to the ovule and becoming systematic invade the vascular system of the pedicel and serial stem. Plants were susceptible to infection at flowering period during the female phase. The pathogen was not seedpiece borne but infected 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 reduction of diseased bunches.
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