Abstract

RAMOS-SANDOVAL, Roberto Ulises et al. Antagonism of two Ascomycetes Against Phytophthora capsici Leonian, Causing Wilt of Pepper (Capsicum annuum L.). Rev. mex. fitopatol [online]. 2010, vol.28, n.2, pp.75-86. ISSN 2007-8080.

In this study we evaluated the antagonistic activity and protection of seedlings in vitro of the ascomycete Xylaria poitei, and its antagonistic activity in combination with an unknown ascomycete (AD) against P. capsici, the cause of wilt in pepper. Xylariapoitei protected pepper seedlings and allowed 58.3% survival of seedlings, while the oomycete caused 100% mortality, besides this fungus inhibited the mycelial growth of P. capsici up to 49.6% in one of the experiments where they settled dual confrontations. In triple confrontations both ascomycetes increase slightly their inhibition at 12 days of confortation against P. capsici, and still maintain the inhibition of the oomycete four days later. It was observed that both ascomycetes stimulare or inhibit each other growth at some time during the evaluation of confortation. The potato dextrose liquid medium exposed to the growth of X. poitei (filtrate) has low activity against the mycelial growth of P. capsici. The above results indicate that the antagonistic activity of both ascomycetes againstbP. capsici increases when they grow in combination with respect to the dual confrontations, and suggest that the antagonistic activity of X. poitei is stimulated by the presence of the oomycete.

Keywords : Xylaria poitei; unknown ascomycete; protection of chilli seedlings.

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