Quality of seeds and senescence of soybean genotypes under two levels of bugs infestation (pentatomidae)

The objective of this research was to evaluate the genotypes CR-1 and CR-3, from the genetic improvement program of soybean flavor of the Federal Univ ersity of Vicosa, in Vicosa, MG, Brazil, under two levels of Heteroptera in festation. The genotypes tested were CR-I, CR-3, Cristalina, Davis (suscept ible genotype) and IAC-100 (resistant genotype). The genotypes CR-I, CR-3, Davis and Cristalina under low level of infestation (2.8 Heteroptera/beatin g) produced similar percentage of normal seeds (57%) but inferior to the ge notype IAC-100 (77%). Under high level of infestation (6.42 Heteroptera/bea ting), the genotypes CR-1, CR-3 and Cristalina produced similar percentage of normal seeds but inferior to the genotypes Davis (43%) and IAC-100 (59%) . All genotypes showed low level of leaves retention (less than 6%) when cu ltivated under low level of infestation by Heteroptera but under high level of infestation of these bugs, the genotypes CR-1 and IAC-100 showed smalle st level of leaf retention (less than 5%) followed by Davis and CR-3 (6-20% ) and Cristalina (21-40%). The genotypes CR-1, IAC-100 and Davis showed no green stem under low infestation, contrary to what was registered for CR-3 (3.6% green stem) and Cristalina (11% green stem). IAC-100, CR-1, and Davis showed the smallest percentages of plants with green stem (6.4, 10.3 and 1 8.3%, respectively) compared to CR-3 (64.8%) and Cristalina (77.3%).