Cross-crop effects on larval growth, survivorship and fecundity of Helicoverpa armigera

Autor(es)

Reigada, Carolina ^{[1, 2]} ; Moral, Rafael de Andrade ^[3] ; Borges Demetrio, Clarice Garcia ^[3] ; Postali Parra, Jose Roberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Entomol & Acarol, Escola Super Agr Luiz de Queiroz, Piracicaba, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Dept Ecol & Biol Evolut, Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Dept Ciencias Exatas, Escola Super Agr Luiz de Queiroz, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PEST SCIENCE; v. 91, n. 1, p. 121-131, JAN 2018.
• Citações Web of Science: 3

Resumo

The cotton bollworm Helicoverpa armigera is a destructive pest that affects a variety of crop plants. Because of its polyphagous feeding habit, mobility as adults, and high fecundity, the expanding infestations of H. armigera in different crops have caused economic losses and difficulties for pest population management. In Brazil, a sequence of different crop systems in the same area and crop rotation during the year can create a spatio-temporal mosaic of crops where H. armigera can persist. However, the consequences of the simultaneous and/or alternating presence of host plants for H. armigera populations through generations are unknown. In this study, we simulated, in the laboratory, hypothetical situations for the availability of soybean and cotton crops in the landscape. We evaluated the effects of: (1) the number of generations during which a population feeds on a host-plant species; (2) the succession of host-plant species on which populations have fed for two generations; and (3) the parental host plant on the fitness of H. armigera populations. Only the current host plant on which larvae fed affected the performance of the H. armigera populations. Decrease of mortality rates during the immature period was slowed when the larvae fed on soybean. The lowest value of reproductive potential (R (0)) was found for individuals originating from mating between females and males reared in cotton. Our results indicated that pest-management and biological-control plans for H. armigera should be developed on a regional scale rather than for just a specific crop area. (AU)

• Processo FAPESP: 14/16609-7 - Abordagem multi e interdisciplinar para compreender padrões espaço-temporais de insetos praga e delinear paisagens para manejo sustentável de pragas em sistemas agrícolas tropicais
• Beneficiário: Wesley Augusto Conde Godoy
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/12903-8 - Modelos e métodos estatísticos para análise de dados entomológicos
• Beneficiário: Rafael de Andrade Moral
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado