Pathogenic variation of Sphaceloma batatas Savu in sweet potato
1990
Sajise, C.E. | Capuno, M.B. (Philippine Root Crop Research and Training Center, Baybay, Leyte (Philippines))
Eight isolates of Sphaceloma batatas were obtained from stem and foliage samples at sweet potato collected from Baybay and Abuyog, Leyte [Philippines]. The differential cultivars, IVSP2, VSP3, G145r-4, BNAS51, V3-158, and CI693-9 were inoculated with spore suspension from each isolate two weeks after planting, then evaluated for disease reaction 16 days later. The data obtained showed that S. batatas isolates varied in their ability to incite disease as reflected in the variation in relative number of lesions produced and the differential reactions of the host varieties. Of the eight isolates tested, the most virulent isolate was PRS182 followed by V11-148 with respective mean lesion density of 43.78 and 38.45. Isolates V11-253, Q145r-4, PRS387, V3-153, BNAS51, and V11-398 were found least virulent with mean lesion densities of 27.7, 23.2, 22.5, 22.1, and 21.2, respectively.
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