-Spodoptera eridania (Cramer) is a pest under expansion in cotton and soybean fields in the cerrado, and biology studies are needed on different hosts. In order to gain knowledge about the biology and leaf intake of S. eridania on cotton, soybean and morning glory (Ipomoea grandifolia), newly-hatched caterpillars were individualized and reared in the laboratory (27 ± 2 o C, R.H. 60 ± 10%, photophase of 14h). Parameters related to biology, leaf intake and reproduction were observed. The larval development period of caterpillars was shorter when fed on cotton and morning glory leaves than on soybean leaves, even though, the survival on soybean had been satisfactory (80%). Caterpillars fed on cotton and morning glory leaves had similar mean pupal weights, however 1.3 and 1.4 times higher than those obtained for male and female pupae, respectively, on soybean leaves. The soybean also influenced prepupal (37.5%) and pupal survival (68.3%) negatively, in contrast with the values obtained on the two other hosts, which were above 91.8%. In general, the soybean leaves were the least suitable for the development of S. eridania, causing 6.3% of pupal deformities. Variables like the pre-oviposition and oviposition periods, number of egg clutches/female and total number of eggs/female were not affected by the diets. Even though cotton leaves were less consumed, they provided good development to the insect. The morning glory weed was shown a suitable alternate host for the species, allowing its development and reproduction in the absence of cultivated hosts.KEY WORDS: Insecta, nutritional ecology, alternative host RESUMO -Spodoptera eridania (Cramer) é uma praga em expansão nas culturas de algodão e de soja no cerrado, necessitando de estudos de biologia em diferentes hospedeiros. Com o objetivo de conhecer a biologia e o consumo foliar de S. eridania em algodoeiro, soja e corda-de-viola (Ipomoea grandifolia), este inseto foi criado em laboratório (27± 2 o C, UR 60± 10%, fotofase de 14h), a partir de lagartas recém-eclodidas e individualizadas. Foram observados parâmetros relacionados à biologia, ao consumo foliar e à reprodução quando alimentadas nos três hospedeiros. O período de desenvolvimento larval foi menor nos insetos alimentados com algodoeiro e corda-de-viola do que em soja, embora a sobrevivência em soja tenha sido satisfatória (80%). Lagartas alimentadas com folhas de algodoeiro e corda-de-viola tiveram peso médio de pupas semelhante, porém 1,3 e 1,4 vezes maior do que o obtido por pupa macho e fêmea, respectivamente, em folhas de soja. A soja, também influenciou negativamente a sobrevivência de pré-pupa e pupa, contrastando com os valores, acima de 91,8%, nos outros dois hospedeiros. Em geral, a folha de soja foi a menos adequada para S. eridania, causando 6,3% de deformidade em pupas. Variáveis como períodos de pré-oviposição, oviposição, número de posturas/fêmea e o total de ovos/fêmea, não foram afetados pelas dietas. Embora as folhas de algodoeiro tenham sido as menos consumidas, elas proporcionaram ...

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Laboratory studies with the southern green stink bug, Nezara viridula (L.) (Hemiptera: Pentatomidae), feeding on seeds or fruits of some alternate host plants, demonstrated differences in nymphal survival and development time, and body weight at adult emergence. Lowest mortalities (25%) were observed for nymphs on fruits of dakota mustard [Brassica kaber (DC.)] and Siberian motherwort (Leonurus sibiricus L.). On fruits of castor bean (Ricinus communis L.) nymph mortality was ca. 60%, and on mature seeds of L. sibiricus ca. 75%. Total development time from second instar to adult ranged from ca. 26 days on B. kaber to ca. 42 days on R. communis. Fresh body weight at adult emergence was greatest for nymphs on L. sibiricus and lowest on R. communis. Adult survival after 30 days and mean longevity was greater on L. sibiricus than on the remaining foods, being drastically reduced on R. communis. In general, reproductive performance on all foods was similar, except R. communis, on which no female reproduced. Female weight gain of N. viridula was generally greater on L. sibiricus. On R. communis, adults lost weight during their first week and showed the lowest weight gain at the end of day 29. Field observations coupled with these laboratory studies suggest that in the Warta area (northern Paraná state, Brazil, 23° 11′ S), L. sibiricus and B. kaber are important alternate food plants in the seasonal phenology of N. viridula. R. communis, however, is of poor nutritional quality, serving primarily as a refuge. Résumé Performances des larves et des adultes de Nezara viridula sur certains hôtes secondares L'alimentation au laboratoire de N. viridula avec les graines et les fruits de diverses plantes a entraîné différentes mortalités larvaires, différentes vitesses de développement et des différences dans les poids des adultes à l'émergence. Les mortalités les plus faibles (25%) ont été observées avec les fruits de Brassica kaber DC. et de Leonurus sibiricus L. Avec les fruits de Ricinus communis L., la mortalité larvaire était de 60%; sur graines mûres de L. sibiricus, elle était de 75%. La durée du développement du second stade à l'adulte a varié de 26 jours sur B. kaber à 42 jours sur R. communis. Le poids frais des adultes à l'émergence était le plus élevé avec L. sibiricus et le plus faible avec de R. communis. La longévité des adultes au‐delà de 30 jours était la plus élevée avec L. sibiricus, et était fortement réduite avec R. communis. Dans l'ensemble, la reproduction était de même importance avec les différents aliments, à l'exception de R. communis avec lequel les femelles ne se reproduisaient pas. Le gain de poids des femelles était généralement supérieur avec L. sibiricus; avec R. communis les adultes ont perdu du poids pendant la première semaine et ont présenté le plus faible gain à la fin du 29ème jour. Des observations dans la nature, associées à ces expériences de laboratoire, laissent supposer que dans la zone de Warta (au Nord de l'état de Paraná, 23° 11′ S, au Bresil), L. sibiricus et B. kaber son...

-The cotton plant, Gossypium hirsutum, hosts various pests that damage different structures. Among these pests, Spodoptera cosmioides (Walker) and Spodoptera eridania (Cramer) (Lepidoptera: Noctuidae) are considered important. The objectives of this study were to characterize and to quantify the potential damage of S. eridania and S. cosmioides feeding on different structures of cotton plants. For this purpose, newly-hatched larvae were reared on the following plant parts: leaf and fl ower bud; leaf and boll; fl ower bud or boll; and leaf, fl ower bud and boll. The survival of S. cosmioides and S. eridania was greater than 80% and 70% for larvae fed on cotton plant parts offered separately or together, respectively. One larva of S. eridania damaged 1.7 fl ower buds, but did not damage bolls, while one larva of S. cosmioides damaged 5.2 fl ower buds and 3.0 cotton bolls. Spodoptera eridania and S. cosmioides can be considered species with potential to cause economic damage to cotton plants because they can occur throughout cotton developmental stages causing defoliation and losses of reproductive structures. Therefore, the results validate fi eld observations that these two species of Spodoptera are potential pests for cotton.