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14 December 2023 Potential of Heterorhabditis indica to Control Agave Weevil, Scyphophorus acupunctatus, at Laboratory Conditions
Francisco Javier Sotelo-Rivera, Lino Mayorga-Reyes, Raquel Alatorre-Rosas, Víctor López-Martínez, Rubén Castro-Franco
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Abstract

Biological control of agave weevil, Scyphophorus acupunctatus Gyllenhal, includes use of entomopathogenic nematodes of the genus Heterorhabditis, which have potential for managing pests with cryptic habits. Virulence of two native isolates of Heterorhabditis indica Poinar, Karunakar & David (A14 and X1) and commercial isolate Heterorhabditis bacteriophora were evaluated on a population of adult agave weevils. Isolates of larvae and pupae of sugarcane weevil, Scyphophorus incurrens, were collected in the State of Morelos, Mexico. Virulence of each isolate was determined by laboratory bioassays to calculate lethal concentration (LC50) and lethal time 50 (LT50) required to eliminate 50% of a population of adult agave weevils. The adult agave weevils were collected at Jalisco, Mexico. For the three isolates evaluated, LC50 ranged from 1,183 to 1,913 infective juveniles, with no significant differences between the isolates evaluated; however, A14 required a lesser LC50. The isolate was statistically different from X1 in terms of LT50 to eliminate 50% of the test population. Based on results of the study, native isolates had potential as biological control agents against S. acupunctatus.

El control biológico del picudo del agave, Scyphophorus acupunctatus Gyllenhal, incluye el uso de nemátodos entomopatogénicos del género Heterorhabditis, los cuales tienen el potencial de controlar plagas de hábitos crípticos. Se evaluó la virulencia de dos aislados nativos de Heterorhabditis indica (A14 and X1), y el aislado comercial Heterorhabditis bacteriophora con adultos del picudo del agave. Aislados de larvas y pupas del picudo de la caña de azúcar, se obtuvieron en Morelos. La virulencia de los aislados se determinó en bioensayos de laboratorio para calcular la concentración letal (CL50) y el tiempo letal 50 (TL50) que pueden eliminar 50% de la población del picudo del agave. Adultos de S. acupunctatus se colectaron en Jalisco, México. Con los tres aislados la CL50 varió entre 1,183 to 1,913 JI adulto, sin diferencias entre ellos. Sin embargo, A14 requirió menor CL50. El aislado A14 fue diferente a X1 en TL50 para eliminar 50% de la población. Los resultados de este estudio muestran que los aislados nativos tienen el potencial como control biológico de S. acupunctatus.

Francisco Javier Sotelo-Rivera, Lino Mayorga-Reyes, Raquel Alatorre-Rosas, Víctor López-Martínez, and Rubén Castro-Franco "Potential of Heterorhabditis indica to Control Agave Weevil, Scyphophorus acupunctatus, at Laboratory Conditions," Southwestern Entomologist 48(4), 917-924, (14 December 2023). https://doi.org/10.3958/059.048.0414
Published: 14 December 2023
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