The productivity criterion was adopted to evaluate stink bug damage. Based on both growing seasons and mainly considering productivity, a few lines could be selected within each maturation group for new fi eld studies or for hybridizations in breeding programs. Among the early germplasm varieties, lines IAC 98-4540, IAC 98-4576, and IAC 98-3123 can be highlighted as promising; the latter also showed little defoliation by A. gemmatalis; in the semi-early group, IAC 98-4017, IAC 98-2663, and IAC 98-4250 were prominent, with steady productivity in both years; in the medium group, IAC 98-4136, the most productive, as well as IAC 98-4140 and IAC 98-4133, all with little defoliation, can be pointed out as promising.

Evaluation of Damage in Soybean Genotypes of Three Maturity Groups Caused by Stink Bugs and Defoliators ABSTRACT-The damage of stinkbugs and defoliators in soybean genotypes was evaluated, under field conditions, at Tarumã and Ribeirão Preto, State of São Paulo, Brazil. Three experiments, one for each of three maturity group, were carried out, in the 1997/98 and 1998/99 seasons. In Tarumã, infestations of Diabrotica speciosa (Germar) and Cerotoma sp. occurred in both seasons and Anticarsia gemmatalis Hubn. in the second; in Ribeirão Preto, this caterpillar occurred only in the second year. Only in the first year in Tarumã, stinkbug infestations [predominantly Piezodorus guildinii (West.)], fluctuated above the economic injury level (EIL); in Ribeirão Preto, the stinkbug infestations did not exceed the EIL. Defoliaton damage was estimated by the percentage of eaten leaf area (PAFC). Percentage of foliar retention (PRF) and yield were used to evaluate the stinkbug damage. Considering both years and both locations, among the early maturing genotypes (110 days), 'IAC-22' showed susceptibility to defoliators while 'IAC-17' confirmed its resistance to this group of pests as well as to stinkbugs. Among the genotypes of 120-day maturity group, IAC 93-3379 could be distinguished for the high yield, showing stability by this criteria. IAC 93-3275 and IAC 93-3237 presented low yield and high PAFC and PRF, mainly in Tarumã. Regarding the genotypes of 135-day maturity group, susceptibility to stinkbugs was observed in 'IAC Holambra-Stwart', 'IAC PL-1' and IAC 87-2048; however, this line showed high yield under low infestation. Also, IAC 78-2318, IAC 93-1789 and IAC 93-1796 presented the lowest PRF, indicating to be less susceptible to this disorder.

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DESCRIPTION, YIELD AND STABILITY OF EARLY SOYBEAN INSECT RESISTANT CULTIVAR IAC-24The 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.

Os cultivares de soja 'paraná', 'viçoja' e 'santa-rosa', a linhagem IAC 73-223 e as introduções PI 171451 e PI 229358 foram testados em condições de campo para avaliar a resistência a percevejos. Ocorreram nesse campo experimental apenas as espécies de percevejos pentatomídios Nezara viridula L. e Piezodorus guildinii Westw. em iguais proporções. A linhagem IAC 73-228 teve a menor porcentagem de grãos danificados (48,1%) na metade superior da planta e as introduções PI 171451 (71,1%) e PI 229358 (79,1%) apresentaram porcentagem intermediária de grãos danificados. O cultivar 'paraná' foi o mais danificado, com 96,87%. Houve correlação significativa entre porcentagem de dano e porcentagem de plantas com retenção foliar (hastes verdes) por ocasião da colheita. Houve correlação positiva entre tamanho dos grãos e dano dos percevejos. O dano foi maior na parte superior das plantas que na inferior.

An experiment to study the growing pattern of a chickpea variety, IAC-Marrocos, was carried out at the Monte Alegre Experimental Station, SP, during 1987 and 1988. The dry matter production of all parts of the plant, as well the leaf area index, were weekly evaluated. Exponential quadratic models of regression were adjusted to total dry matter, leaf dry matter and leaf area index, and a linear model to dry matter of grain. Based on the growth analysis it was concluded that the chickpea is a rustic eatable plant that can be recommended as an alternative winter crop for similar climatic conditions as those of the experiment.

The use of soybean cultivars resistant to insects and diseases reduces the application of pesticides, decreasing production costs and promoting a sustainable agriculture. The damage of stink bugs and defoliators and the severity of powdery mildew (Microsphaera diffusa) in soybean of three maturity groups were evaluated under field conditions, at Tarumã and Ribeirão Preto, State of São Paulo, Brazil. Three experiments, one for each group, were carried out in the 1999/2000 and 2000/2001 growing seasons. In 1999/2000, the disease occurred in Tarumã; in that year, infestation of chrysomelids (Cerotoma sp. and Colaspis sp.) was observed in Ribeirão Preto. Low infestations of stink bugs occurred in both years and locations, but in Tarumã, at the stage of plant maturation, the insect population exceeded the economic injury level. The severity of powdery mildew was evaluated using a scale varying from 1 (no symptom) to 5 (more than 50% of leaves with symptoms). Chrysomelid injuries were estimated by the percentage of leaf area removed, and stink bug damage was evaluated by the percentage of leaf retention (LRP) and yield. Within the early maturity group (110 days), IAC 94-2675 showed good yield levels, low LRP, and resistance to powdery mildew. In the genotypes of the 120-day maturity group, IAC 94-5, IAC 94-1172, IAC 94-1017, IAC 94-133, and IAC 94-745 presented good yield; the last two behaved as resistant to the disease. With regard to the genotypes of the 135-day maturity group, IAC 93-1564 and IAC 94-2939 showed good yield, low LRP, and resistance to powdery mildew. Keywords: Glycine max, Microsphaera diffusa, host plant resistance, stink bugs, defoliators DANOS DE INSETOS E SEVERIDADE DE OÍDIO EM CULTIVARES E LINHAGENS DE SOJA

RESUMOForam analisadas sementes de tegumento creme e alaranjado de feíjão--guandu (Cajanus cajan (L.) Mfllsp.), oriundas do cultivar Kaki, quanto aos teores deproteína, extrato etéreo, açúcares solúveis e polissacarídeos. Os dois tipos de sementes apresentaram composição química similar. Os teores médios encontrados foram: proteína 23,11%, extrato etéreo 1,34%, açúcar solúvel 9,46% e polissacarídeos 16,77%. A fração proteica apresentou baixos níveis de aminoácidos sulfurados, isoleucina, valina e treonina.Termos de indexação: grãos de feijão-guandu; Cajanus cajan (L.) Millsp.; substâncias de reserva.