Soybean genotypes on the development of soybean looper

ABSTRACT: Constitutive mechanisms of plants are responsible for affecting herbivore/host interactions, resulting in behavioural or metabolic effects capable of reducing crop losses. The objective of this study was to evaluate the effect of soybean genotypes (Glycine max [L.] Merr.; Fabaceae) BRS 391, BRS 6203RR, TEC IRGA 6070RR, BMX ValenteRR, BMX Icone Ipro, and the breeding lines PELBR 10-6000RR and PELBR 10-6049RR in Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae) through the evaluation of the following biological parameters: duration and viability of all development phases, number of larval instars, sex rate, weight and deformation of pupae, and the fertility life table. For this, 150 larvae per genotype were used, maintained at 25 ± 1 ºC, 70 ± 10% RH, 14:10 h (L:D) photophase. The frequency of the width of cephalic capsules indicated the occurrence of 6 larval instars for the genotypes. The TEC IRGA 6070RR and BMX Icone Ipro genotypes caused 100% larval mortality in the first 5 d. The BRS 391 and BRS 6203RR genotypes reduced larval viability; the latter also presented the highest percentage of deformed pupae. The BMX ValenteRR genotype promoted the lowest egg viability. The PELBR 10-6049RR and PELBR 10-6000RR breeding lines are not predisposed to antibiosis and were more susceptible to C. includens. The BRS 6203RR, BRS 391 and TECIRGA 6070RR genotypes significantly affected the biological parameters of C. includens, characterizing the expression of antibiosis, thus, they can be considered for use in the southern region of Rio Grande do Sul (REC 101) to reduce the larval population.