Translator Disclaimer
1 April 2014 Baseline Susceptibility and Monitoring of Brazilian Populations of Spodoptera frugiperda (Lepidoptera: Noctuidae) and Diatraea saccharalis (Lepidoptera: Crambidae) to Vip3Aa20 Insecticidal Protein
Oderlei Bernardi, Douglas Amado, Renan S. Sousa, Fabiana Segatti, Julio Fatoretto, Anthony D. Burd, Celso Omoto
Author Affiliations +
Abstract

The genetically modified maize expressing Vip3Aa20 insecticidal protein from Bacillus thuringiensis Berliner is a biotechnological option for the control of Spodoptera frugiperda (J.E. Smith) and Diatraea saccharalis (F.) in Brazil. To support an Insect Resistance Management program, we conducted studies of baseline susceptibility and monitoring of Brazilian populations of S. frugiperda and D. saccharalis to the Vip3Aa20 insecticidal protein. Neonates were exposed to Vip3Aa20 applied on artificial diet surface. Mortality and growth inhibition were assessed after 7 d. All populations were susceptible to Vip3Aa20. The LC50 ranged from 92.38 to 611.65 ng Vip3Aa20/cm2 for 16 populations of S. frugiperda (6.6-fold variation), and between 61.18 and 367.86 ng Vip3Aa20/cm2 for 6 populations of D. saccharalis (sixfold variation). The EC50 ranged from 21.76 to 70.09 and 48.65 to 163.60 ng Vip3Aa20/cm2 for S. frugiperda and D. saccharalis, respectively. There was a low interpopulation variation in susceptibility to Vip3Aa20, which represents the natural geographic variation in the response, and not the variation caused by previous exposure to selection pressure. For these two pests, the diagnostic concentrations of 2,000 and 3,600 ng of Vip3Aa20/cm2 caused high mortality. These diagnostic concentrations will be used in resistance monitoring programs in Brazil.

© 2014 Entomological Society of America
Oderlei Bernardi, Douglas Amado, Renan S. Sousa, Fabiana Segatti, Julio Fatoretto, Anthony D. Burd, and Celso Omoto "Baseline Susceptibility and Monitoring of Brazilian Populations of Spodoptera frugiperda (Lepidoptera: Noctuidae) and Diatraea saccharalis (Lepidoptera: Crambidae) to Vip3Aa20 Insecticidal Protein," Journal of Economic Entomology 107(2), 781-790, (1 April 2014). https://doi.org/10.1603/EC13374
Received: 27 August 2013; Accepted: 1 January 2014; Published: 1 April 2014
JOURNAL ARTICLE
10 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top