Abstract
Sixty artificially infested grain sorghum genotypes were evaluated for resistance against Busseola fusca. Evaluation of leaf feeding damage indicated levels of resistance ranging from intermediate to susceptible. Genotypes were categorized according to the presence or absence of both antibiotic and tolerant characteristics. Genotypes (17%) exhibited both antibiosis against leaf feeding and tolerance for borer damage. Borer damage resulted in a 4% increase in grain yield of one genotype and a 50% increase in the number of heads of a second genotype. Tolerance and recovery resistance were the most important factors limiting yield loss in grain sorghum genotypes. In this study, the ability of sorghum for tillering (recovery resistance) was separated from the ability to produce heads on infested stems (tolerance). The importance of distinguishing between tolerance and recovery resistance in the evaluation of sorghum germplasm for borer resistance is emphasized.
Résumé
Soixtante genotypes de graine do sorgho, infestés articiellement ont éte évalués pour leur résistance aux Busseola fusca. L’evaluation de dégâts dans l’alimentation des feuilles a révelé des niveaux de résistance allant d’intermédiaire à susceptible. Des génotypes ont été classés d’aprés la présence ou l’absence de traits caractéristiques d’antibiotiques et de tolérance. Dix-sept pour cent des génotypes ont montré de l’antibiose centre l’alimentation des feuilles ainsi que la tolérance aux dégâts causées par des perçeurs. Ces dégâts s’élèvent à une augmentation de 4% dans la production de graines d’un genotype, et de 50% dans la guantité d’epis d’un deuxième genotype.
La tolérance et la résistance de rétablissement ont été les facteurs les plus importants qui limitentent la perte de production de génotypes de graine de sorgho. Dans cette recherche, la capacité de sorgho pour le tillage (résistance de rétablissement) a éte séparée de la capacité de production d’epis sur des tiges infestées (toléerance). L’importance de distinguer entre la tolérance et la résistance de rétablissement dans le cas de l’évaluation de plasme germinal de sorgho pour la résistance aux perceurs a été accentuée.
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Van Den Berg, J., Wenzel, W.G. & Van Der Westhuizen, M.C. Tolerance and Recovery Resistance of Grain Sorghum Genotypes Artificially Infested with Busseola Fusca (Fuller) (Lepidoptera: Noctuidae). Int J Trop Insect Sci 15, 61–65 (1994). https://doi.org/10.1017/S1742758400016775
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DOI: https://doi.org/10.1017/S1742758400016775