Biocontrol Science and Technology (2002) 12, 165-172
Lilian Z. De Luna, Alan K. Watson and Timothy C. Paulitz (2002)
Seedling blights of Cyperaceae weeds caused by Curvularia tuberculata and C. oryzae
Biocontrol Science and Technology 12 (2), 165-172
Abstract: Two Curvularia tuberculata isolates (93-020 and 93-022) and one C. oryzae isolate (93-061) were obtained from diseased Cyperus difformis, C. iria, and Fimbristylis miliacea, respectively, in the Philippines in 1993. When inoculated onto their hosts at 1 2 108 conidia m-2, and provided with 24-h dew at 28°C, a severe and rapid blighting of the leaves caused the weed seedlings to die within two weeks. The three Curvularia isolates were cross-pathogenic to C. difformis, C. iria, F. miliacea, and C. rotundus but exhibited varying degrees of virulence depending on the weed species being attacked. C. tuberculata isolates 93-020 and 93-022 effectively controlled C. difformis and C. iria but were less effective on F. miliacea. C. oryzae was equally virulent on C. difformis, C. iria, and F. miliacea. C. rotundus was not killed by any of the three isolates and exhibited only minor flecking and leaf tip die-back. Sporulation of the three Curvularia isolates on necrotic leaf tissues occurred on the susceptible (C. difformis, C. iria, and F.miliacea) but not on the resistant (C. rotundus) weed hosts.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Timothy C. Paulitz, Alan K. Watson
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
