Trials were carried out with seven soybean genotypes, to evaluate the resistance to Bemisia tabaci Genn. biotype B, between October 2000 and January 2001, at the Faculdade de Ciências Agrárias e Veterinárias - UNESP Jaboticabal, SP, Brazil. Oviposition non-preference (free choice and no-choice tests) and antibiosis were evaluated as well as the correlation between the density of the trichomes present in the genotypes' leaflets and oviposition preference. Among the genotypes tested, BR-82 12547 and PI 229358 showed non-preference type resistance to oviposition of the silverleaf whitefly, and oviposition was positively correlated with the total density of trichomes. Thus, PI 227687 with the biggest quantity of trichomes was the most oviposited genotype, whereas BR-82 12547 and PI 229358 with the smallest quantities of trichomes were the least oviposited genotypes. The antibiosis test was accomplished with five genotypes: BR-82 12547, IAC 100, IAC 78-2318, PI 229358 and PI 227687, selected from the oviposition non-preference test. IAC 100 affected negatively B. tabaci biotype B, by prolonging the ninfal period (12,8 days) and the reducing adults' emergence (80,0%).
Bemisia argentifolii; Glycine max; host plant resistance; trichome
