Details

Autor(en) / Beteiligte

• De Luna, Lilian Z.
• Watson, Alan K.
• Paulitz, Timothy C.

Titel

Seedling Blights of Cyperaceae Weeds Caused by Curvularia tuberculata and C. oryzae

Ist Teil von

• Biocontrol science and technology, 2002-03, Vol.12 (2), p.165-172

Ort / Verlag

Taylor & Francis Group

Erscheinungsjahr

2002

Quelle

Taylor & Francis

Beschreibungen/Notizen

• 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 &#50 10 8 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.