The breeding line IAC 93-3335 (IAC-24) was selected from the cross IAC 80-1177 x IAC 83-288 through single seed descent method (SSD) by the IAC breeding program to increase insect resistance. This cultivar has in its background two important genotypes: PI 229358 e PI 227687 (USDA germplasm), as sources of resistance to insect. The cultivar was evaluated at experimental fields in Conceição das Alagoas (MG), Campinas (SP) and Mococa (SP) (1994/95), in Conceição das Alagoas, Campinas, Tarumã (SP) and Votuporanga (SP) (1995/96) and Conceição das Alagoas, Campinas, Tarumã, Votuporanga, Mococa, Capão Bonito (SP) and Ribeirão Preto (SP) (1996/97). The trials were installed using randomized block design, with four replications. Results of productivity indicate that the cultivar IAC-24 shows lower yields at Campinas, with 2302 kg.ha-1, and higher yields at Conceição das Alagoas, with 4003 kg.ha-1. The IAC-24 soybean exhibits long juvenile period, flowering time at 57 days, and complete life cicle around 124 days after seed germination. Plants show brown pubescence, yellow seeds with brown hilum. The new cultivar is resistant to bacterial pustule (Xanthomonas campestris pv. glycines), "wildfire" (Pseudomonas seringae pv tabaci), stem cancker (Diaporthe phaseolorum f.sp. meridionalis) and soybean mosaic virus(SMV). Joint analysis showed significant effects of genotypes, environments and interactions. For each environment, joint analysis were also realized. The IAC-24 cultivar showed the highest yield (3.480 kg.ha-1). The Dunnet test indicated that the difference was significant when compared with IAC-15. Among the lines, IAC-24 showed the lowest defoliation by caterpillars, and presented low pod damage similar to IAC-100 soybean cultivar. So, the new cultivar is resistant to insect damage, has good yield, and should be recommended for cultivation in State of São Paulo and similar environments.
Glycine max; insect resistance
