Florida Entomologist (2002) 85, 537-544

C.W. McCoy, R.J. Stuart, L.W. Duncan and K. Nguyen (2002)
Field efficacy of two commercial preparations of entomopathogenic nematodes against larvae of Diaprepes abbreviatus (Coleoptera: Curculionidae) in alfisol type soil
Florida Entomologist 85 (4), 537-544
Abstract: Spring and fall field trials were conducted to determine the efficacy of two species of entomopathogenic nematodes for the control of larvae of Diaprepes abbreviatus in a citrus grove with alfisol type soil (sandy clay loam). Both Steinernema riobrave (Bio Vector 355) as a water-dispersible granule and Heterorhabditis indica (Grubstake™ 100) as a paste on sponge at rates from 22-108 IJ's/cm² failed to reduce larval populations in the tree rhizosphere at 25 d post-treatment. Larval parasitism by entomopathogenic nematodes in baited screen cages was sporadic over time, with the only significant treatment effect occurring at the highest rate (108 IJ's/cm²) of S. riobrave in the fall at 7 d post-treatment. Possible constraints to nematode efficacy are discussed.

Se llevaron a cabo pruebas de campo en la primavera y el otoño para determinar la eficacia de dos especies de nemátodos entomopatógenos para el control de larvas de Diaprepes abbreviatus en huertos de cítricos con suelo de tipo alfisol (marga arcilla arenosa). Las dos especies, Steinernema riobrave (Bio Vector 355) en la forma granular dispersable en agua, y Heterorhabditis indica (Grubstake™ 100) en la forma de una pasta puesta encima de una esponja al porcentaje de 22-108 IJ's/cm², no redujeron la población de larvas en la rizosfera a 25 d después del tratamiento. El parasitismo de larvas por nemátodos entomopatógenos en jaulas de tela metálica con cebo fué esporádico durante el tiempo del estudio, el único efecto significativo del tratamiento sucedió en la concentración más alta (108 IJ's/cm²) de S. riobrave en el otoño a los 7 d después del tratamiento. Se discuten las posibles restricciones a la eficacia de nemátodos.
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Full text of article
Database assignments for author(s): Robin J. Stuart, Larry W. Duncan

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaprepes abbreviatus	Citrus (genus)	U.S.A. (SE)