Oviposição, desenvolvimento e reprodução de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) em diferentes hospedeiros de importância econômica

Abstract

-The host selection for oviposition by Spodoptera frugiperda (J.E. Smith) among corn, millet, cotton and soybean, and its relationship with the biological characteristics were investigated. Free and non-choice tests for oviposition using plots containing fi ve plants each, from each host in plastic greenhouse, resulted in similar oviposition preference among the host plants. In addition, selected biological characteristics of S. frugiperda were determined in the laboratory with larvae feeding on host leaves, and the combination of leaf and cotton boll. Neonate larvae exhibited low success of colonization on cotton boll compared to the leaves of all other hosts. Spodoptera frugiperda fed only on cotton bolls exhibited longer larval and pupal development, and longer adult life span; however with similar egg production. Larvae fed cotton leaves during six days and then transferred to cotton bolls, however, exhibited development and reproduction similar to those reared on corn or only on cotton leaves. Therefore, the variations on immature stages of S. frugiperda were not related with host selection for oviposition which was similar among the studied hosts. Based on our data, the millet as a winter, rotational, and cover crop is a potential host for S. frugiperda, while leaves and cotton bolls were diets of intermediate suitability as compared to corn and soybean leaves.

Inheritance and fitness costs of Spodoptera frugiperda (Lepidoptera: Noctuidae) resistance to spinosad in Brazil

“…The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a polyphagous pest that causes severe economic damage to several important agricultural crops in the western hemisphere, especially in South America . In Brazil, it is considered one of the most destructive pests of maize and cotton . The success of S. frugiperda as a pest species is attributed to biological characteristics such as polyphagia, adult dispersion, high reproductive capacity and the production of several generations per year …”

Managing fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), with Bt maize and insecticides in southern Brazil

“…In Brazil, maize is cultivated in two seasons during the year in the central‐western region, and, in areas with irrigation, maize is also planted in an additional season for seed production. This production system favors the occurrence of high infestations of FAW at all stages of maize growth . In contrast, in the southern region, the typical planting season is from August to January, when the climatic conditions allow plant development.…”

Seleção de clones de braquiária para resistência à lagarta-do-cartucho

“…No Brasil, um dos fatores que pode estar contribuindo para a dificuldade do manejo de S. frugiperda é a grande oferta de hospedeiros ao longo do ano, seja pela sucessão de culturas (Barros et al, 2010) para pragas polífagas. Este é o caso, por exemplo, do consórcio de lavouras de milho com forrageiras da espécie Urochloa, que, no presente trabalho, mostrou ser hospedeira relativamente favorável a S. frugiperda.…”