Identification of major seed potato storage diseases in Benguet and Mountain Province, Philippines
1988
Luis, J.S. | Quimio, A.J. (Benguet State Univ., La Trinidad, Benguet (Philippines))
A four year survey (1983-1986) was undertaken to identify major seed potato storage pathogens in Benguet and Mountain Province [Philippines]. Fusarium sambunicum, F. solani, Rhizoctonia solani, Pseudomonas solanacearum (Biovars I and II) and a complex of F. solani + R. solani and occasionally F. solani + Streptomyces scabies were isolated from diseased tubers. Except for F. sambunicum, all pathogens were consistently present in all survey sites throughout the survey seasons. F. solani was more virulent than F. sambunicum. All pathogens caused extensive rotting in inoculation experiments. Latent infections of these major storage pathogens were also observed. Disease incidence was generally higher during the wet season. Commonly associated fungi which did not cause rotting when inoculated alone in intact tubers included Aspergillus sp., and Penicillium sp. Streptomyces scabies, although frequently observed, was not considered as storage pathogen since it affects only the skin.
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