Resumo

FIGUEROA MEDINA, Wilmer; RAMIREZ SULVARAN, Jesús Arturo  e  SIGARROA RIECHE, Alina Katil. Effect of native strains Paecilomyces sp. (Bainier) and Lecanicillium sp. (Zimm) on the control of Carmenta foraseminis Eichlin (Lepidoptera: Sesiidae) on cocoa (Theobroma cacao L.) crops. Acta Agron. [online]. 2013, vol.62, n.3, pp.279-286. ISSN 0120-2812.

The fruit borer, Carmenta foraseminis Eichlin, is an insect that has increased up its attack in cocoa (Theobroma cacao L.) in recent years in northern Santander, Colombia. The objective was to evaluate the pathogenicity of two native strains Paecilomyces sp. Giav-3 and Lecanicillium sp. Giav-4, on larvae of C. foraseminis. Isolations were made from soil samples collected in the municipality of Tibú, Northern Santander, Colombia. After obtaining pure cultures, macroscopic and microscopic characterization for gender identification of the strains using taxonomic keys was done. The evaluation was conducted by immersion of larvae in suspensions of the isolates at concentrations of 0, 10⁶, 10⁷ and 10⁸ conidia/ml. For both strains there was a linear trend in mortality, which was directly proportional to the concentrations of the inoculum. The LC₅₀ and LC₉₀ for Giav-3 were 10^6.95 and 10^8.70 conidia/ ml, and for Giav-4 was 10^6.6 and 10^8.04 conidia/ml, respectively. This indicates that Giav-4 required the lowest concentration of inoculum to remove 50 to 90% of the treated population, indicating it is more effective against larvae.

Palavras-chave : Biological control; Lecanicillium sp.; Paecilomyces sp.; Theobroma cacao.

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