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espanolSpodoptera eridania es una especie polifaga, cuya oruga puede alimentarse de plantas de caupi. Aunque hay algunos conocimientos sobre la resistencia de cultivares de caupi, se conoce poco sobre los efectos de aceite de nim para controlar insectos plaga de caupi, en Brasil. Esta investigacion tuvo como objetivo evaluar los efectos de cultivares de caupi asociados con aceite de nim sobre la atraccion, alimentacion, y desarrollo de Spodoptera eridania (Cramer). El experimento se llevo a cabo bajo condiciones ambientales controladas, en un diseno factorial 6x3, evaluando seis cultivares de caupi y dos dosis de aceite de nim, ademas del tratamiento testigo (agua desionizada). Se realizaron pruebas de no preferencia para alimentacion con y sin opcion de escoger para evaluar la atraccion de los tratamientos a las larvas y el consumo de las hojas. Se registro la duracion y supervivencia de larvas, prepupas y pupas, pesos de larvas y pupas, longevidad de los adultos, proporcion sexual, duracion del periodo de larva a adulto, y mortalidad larval despues de 3, 6, 12, y 24 dias. Los cultivares BRS Urubuquara y BR17 Gurgueia fueron los menos consumidos en la prueba de libre eleccion. El consumo de hojas fue reducido cuando utilizo aceite de nim a 0,35 y 0,7%. Los cultivares BRS Novaera y BR17 Gurgueia mostraron ser los menos adecuados para el desarrollo de S. eridania. Aceite de nim en ambas dosis afecto el desarrollo de S. eridania. Los cultivares BR7 Gurgueia y BRS Novaera fueron moderadamente resistentes; BR3 Tracuateua, susceptible; y Sempre Verde, Milenio, y BRS Urubuquara fueron altamente susceptibles a S. eridania. EnglishThe southern armyworm Spodoptera eridania is a polyphagous species that can feed on cowpea plants. Although there is some knowledge about the resistance of cowpea cultivars, little is known on the effects of neem oil to control pest insects of cowpea in Brazil. This study aimed to evaluate the effects of cowpea cultivars combined with neem oil on attractiveness, feeding, and development of Spodoptera eridania (Cramer). The experiment was carried out under environmentally controlled conditions, and set up in a 6 x 3 factorial arrangement using six cowpea cultivars and two doses of neem oil plus the control (deionized water). Free-choice and no-choice feeding preference assays were performed to assess treatment attractiveness to the larvae and leaf consumption. Duration and survival of larvae, pre-pupae, and pupae, weights of larvae and pupae, longevity of adults, sex ratio, duration of larva-to-adult period, and larval mortality after 3, 6, 12, and 24 days were recorded. Cultivars BRS Urubuquara and BR17 Gurgueia were the least consumed in the free-choice test. Neem oil at 0.35 and 0.7% reduced leaf consumption. Cultivars BRS Novaera and BR17 Gurgueia showed to be the least suitable for S. eridania development. Neem oil at both doses affected S. eridania development. Cultivars BR7 Gurgueia and BRS Novaera were moderately resistant; BR3 Tracuateua, susceptible; and Sempre Verde, Milenio, and BRS Urubuquara were highly susceptible to S. eridania.

Effects of cowpea cultivars and neem oil on attractiveness, feeding, and development of Spodoptera eridania (Cramer) (Lepidoptera: Noctuidae)