Host range and virulence tests of selected biovar isolates of Pseudomonas solanacearum [Philippines]
1989
Smith, E.F. | Fandialan, M.V.C. | Valdez, R.B. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Plant Pathology)
The host range and relative virulence of nine selected biovar isolates of Pseudomonas solanacearum obtained from tomato (B3,4), pepper (B3,4), white potato (B2, 3,4) and eggplant (B3,4) were studied in cross-inoculation tests to seven crops and nine weed species. The most virulent, in terms of percent mortality and infection were, in decreasing order, the biovar 4 isolates T6, P10 and E5 followed by the biovar 3 isolates E18, T151, WP12 and P15. Among the three white potato isolates, WP12 (B3) was the most virulent followed by WP14(B4) and the least virulent was the biovar 2 isolate WP112 which was highly specific to white potato and tomato. Among the nine weed species cross-inoculated with the nine isolates of P. solanacearum, Vernonia cinerea, Emilia sonschifolia and Portulaca oleracea were the most susceptible hosts to all isolates, except WP112. Synedrella Nodiflora, Ageratum conyzoides and Amaranthus spinosus were infected to a low degree only by T6 (B4), P10 (B4) and E18(B3). Cleome rutidosperma was infected to a very low degree by WP12(B3) only with no mortality. Okra, cassava, sweet potato, Trianthema portulacastrum and Commelina benghalensis were not infected by any of the isolates.
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