U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska
Date of this Version
3-2017
Citation
ANNUAL REPORT OF THE BEAN IMPROVEMENT COOPERATIVE, No. 60, March 2017. Published by USDA.
Abstract
INTRODUCTION The species Spodoptera frugiperda (Smith, 1797) (Lepidoptera: Noctuidae) is a widely distributed pest in the American continent and with a polyphagous habit, causing damage to several crops of economic importance, such as bean bean (CASMUZ et al., 2010). The most control measure to manage S. frugiperda is based on sprayings of chemical insecticides. However, alternative methods less damaging to the environment have been proposed. The host plant resistance is one of them, through plants that present in their constitution genes that are capable of producing substances that interfere in the behavior and/or development of the insect (BOIÇA JÚNIOR et al., 2015). The ability of these plants to tolerate damage caused by insect pests has been aided in breeding programs to obtain genotypes with resistance characteristics. Thus, the aim of this study was to evaluate S. frugiperda larval feeding preference in common bean genotypes.
MATERIAL AND METHODS The following genotypes were evaluated for resistance to S. frugiperda larvae: BRS Pérola, IAC Harmonia, BRS Supremo, BRS Talismã and IPR Campos Gerais. Double and multiple choice tests were performed under a randomized complete block desing, with 10 replications each. In the multiple-choice test, arenas composed of 14-cm-diamenter Petri dishes were used. In the double choice test, 8-cm-diamenter Petri dishes were used, confronting the genotypes two by two. Petri dishes were coated to the bottom with moistened filter paper, and 3- cm-diameter leaf disc of the respective genotype was distributed equidistantly. In both tests, third-instar larvae of S. frugiperda was released per genotype.
Comments
U.S. government work.