Este trabajo tuvo como objetivo encontrar genotipos de soya con baja preferencia para alimentación por larvas de Spodoptera eridania en 23 genotipos evaluados en tres experimentos, de los cuales IAC 100 se estableció como el genotipo resistente y BR 16 como el susceptible. De los resultados obtenidos en estas pruebas, se realizó un experimento final con los 10 genotipos más destacados: IAC 100, PI 227682, PI 227687, DM 339, P 98Y51 RR, BRSGO 8360, IGRA RA 518 RR, IGRA RA 516 RR, IGRA RA 626 RR y BR 16. En todos los experimentos, se realizaron pruebas con y sin opción de elección. En el primer caso, se pusieron los discos foliares relacionados a los genotipos en placas de Petri y se liberó una larva de tercer estadio por genotipo. En el segundo, se utilizó un disco de cada genotipo por placa donde se liberó una larva de tercer estadio. La atracción de las larvas de tercer estadio además del área foliar consumida por las mismas se evaluaron a 1, 3, 5, 10, 15, 30, 60, 120, 360, 720 y 1080 minutos después de su liberación. En ambas pruebas el genotipo IAC 100 fue el menos atractivo y consumido por las larvas, mientras que el BRSGO 8360 y P 98Y51 RR fueron los más consumidos en las pruebas con y sin elección, respectivamente. El genotipo IAC 100 fue altamente resistente a S. eridania en experimentos de preferencia alimenticia y por lo tanto puede ser cultivado o incorporado en programas de mejoramiento con el fin de obtener plantas de soya con características de resistencia a esta plaga.

This work aimed to find soybean genotypes with low feeding preference by Spodoptera eridania larvae on 23 genotypes evaluated in three experiments, of which IAC 100 was established as the resistant genotype and BR 16 as the susceptible genotype. From the results obtained in these tests, a final experiment was carried out with the 10 most outstanding genotypes: IAC 100, PI 227682, PI 227687, DM 339, P 98Y51 RR, BRSGO 8360, IGRA RA 518 RR, IGRA RA 516 RR, IGRA RA 626 RR and BR 16. In all experiments, free choice and no choice tests were performed. In the former, leaf discs corresponding to the genotypes were placed in Petri dishes and then one third-instar larva per genotype was released. In the latter we used one leaf disc of each genotype per plate where one third-instar larva was released. The attractiveness of the third-instar larvae was evaluated at 1, 3, 5, 10, 15, 30, 60, 120, 360, 720 and 1080 minutes after their release, as well as the leaf area consumed. In both tests the genotype IAC 100 was the least attractive and consumed by the larvae, whereas BRSGO 8360 and P 98Y51 RR were the most consumed in free choice and no choice tests, respectively. Genotype IAC 100 was highly resistant to S. eridania in feeding preference experiments and thus can be cultivated or incorporated into breeding programs in order to obtain soybean plants with resistance characteristics to this pest.

Avaliou-se a influência de genótipos de feijoeiro associado à aplicação de óleo de nim e inseticida no controle de B. tabaci (Gennadius) biótipo B e C. phaseoli (Hood) na época de semeadura "das águas". O delineamento experimental utilizados foi o de blocos casualizados dispostos em um esquema fatorial 4 x 3 x 3, representado por variedades, óleo de nim e inseticidas, respectivamente, com três repetições. Utilizaram-se os genótipos Carioca, IAC Harmonia, IAC Centauro e Pérola. As avaliações foram realizadas dos 14 aos 42 dias após a emergência das plantas, contando-se o número de ovos e ninfas de B. tabaci biótipo B e ninfas de C. phaseoli nos folíolos dos genótipos. Concluiu-se: o número de ovos e ninfas de B. tabaci biótipo B foi menor em IAC Centauro e maior em IAC Harmonia. Os genótipos testados foram igualmente infestados por C. phaseoli. IAC Centauro e IAC Harmonia associado ao óleo de nim e com destaque a dose cheia (1,0%), propiciaram menor número de ovos de mosca branca e de ninfas tripes, e o último deles atuou reduzindo o número de ninfas de mosca branca. Nos genótipos testados o inseticida proporcionou redução no número de ovos e ninfas de mosca branca e de ninfas de tripes, com incremento na dose recomendada.

The influence of bean genotypes associated with neem oil as insecticide was evaluated to control B. tabaci (Gennadius) biotype B and C. phaseoli (Hood) during the wet season sowing. The experimental design used was the randomized block arrangement in a 4x4x3 factorial scheme, represented by genotypes, neem oil and insecticides respectively, with three replications. The genotypes Carioca, IAC Harmonia, IAC Centauro and Pérola were used. The evaluations were done at 14 and 42 days after seedling emergence, by counting B. tabaci biotype B eggs and nymphs and C. phaseoli nymphs in the genotypes leaf. Conclusion: The B. tabaci biotype B eggs and nymphs number were smaller in IAC Centauro and higher in IAC Harmonia. The tested genotypes were similarly infested by C. phaseoli. IAC Centauro and IAC Harmonia genotypes associated with neem oil (highlighting the full dose - 1%) provided lower number of whitefly eggs and thrips nymphs. Neem oil at the full dose also reduced whitefly nymph number. In the tested genotypes the insecticide provided reduction in the number of whitefly eggs and nymphs as well in the thrips nymphs, with increase in the recommend dose.