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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 73, No. 2, 2013, pp. 135-141
Bioline Code: cj13020
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 73, No. 2, 2013, pp. 135-141

 en Bioactivity of a water extract of boldus ( Peumus boldus check for this species in other resources Molina) against Spodoptera frugiperda check for this species in other resources (J.E. Smith) and Helicoverpa zea check for this species in other resources Boddie (Lepidoptera: Noctuidae)
Silva, Gonzalo; Rodríguez, J. Concepción; Blanco, Carlos A. & Lagunes, Angel

Abstract

The insecticidal properties of water-extract of Peumus boldus check for this species in other resources Molina and its effect on the development cycle and feeding habits of Spodoptera frugiperda check for this species in other resources J.E. Smith and Helicoverpa zea check for this species in other resources Boddie were evaluated under laboratory conditions in concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0% (w/w). Spodoptera frugiperda was the most susceptible with 75% mortality at 7 d at 8% P. boldus concentration, while H. zea had only 30% mortality. LC50 was 2.31 mL kg-1 for S. frugiperda and 16.05 mL kg-1 for H. zea. When the extract concentration increased in the diet, larval size and weight, percentage of pupation and number of adults decreased, and the time required to reach those states was greater. Neonate larvae fed primarily on the diet with the lower extract concentration and the control was preferred by more than 50% of larvae. Inhibition of feeding, growth, weight gain of 3rd instar larvae as well as new biomass production decreased with concentration of the extract.

Keywords
Fall armyworm, corn earworm, botanical insecticides, nutritional indexes.

 
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