Keywords
hongos nematófagos
capacidad depredadora
Meloidogyne sp
in vitro test
nematophagous fungi
predatory capacity
meloidogyne sp
How to Cite
Abstract
Parasitism in vitro of 14 isolates of nematophagous fungi (6 Trichoderma sp., 4 Paecilomyces sp., 2 Fusarium oxysporum and 2 Monacrosporium sp.) was evaluated againts juveniles and eggs of the root-knot nematode, Meloidogyne javanica. The fungi, from three rice-producing regions of Costa Rica (Central Pacific, Atlantic Huetar and Chorotega), were isolated by the sprinkling technique, during April 2008 to August 2009. A completely randomized design with 10 replicates in water agar (WA) per fungus was used. A suspension of 1 to 1.5x10 6 conidia (cfu.ml -1 ) per Petri dish was inoculated, and during the fourth day was added a suspension of 0.5 ml with 150 juvenile and 100 eggs of M. javanica previously disinfected, at room temperature (23-26oC) and with natural light. After 96 hours, it was counted in every dish the number of living, dead and parasitized nematodes, plus eggs parasitized or not parasitized. Subsequently, a logistic regression analysis (RL) for the evaluated variables was performed, which showed significant differences (p<0.0001) in the performance of the evaluated isolates, presenting ranges from 10% to 56% in dead nematodes, 13% to 79% in parasitic nemato- des and 1% to 96% in parasitized eggs. In general, isolates of Trichoderma sp. (Tri1, Tri2, Tri3 and Tri4) were the most efficient in the parasitism over juveniles and eggs of M. javanica.References
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