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


    Reigada, Carolina and de Andrade Moral, Rafael and Borges Demetrio, Clarice Garcia and Postali Parra, Jose Roberto (2017) Cross-crop effects on larval growth, survivorship and fecundity of Helicoverpa armigera. Journal of Pest Science. ISSN 1612-4758

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    Abstract

    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 (R0) 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.

    Item Type: Article
    Keywords: Offspring fitness; Parental diet effects; Life table; Polyphagy;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 13261
    Identification Number: https://doi.org/10.1007/s10340-017-0893-5
    Depositing User: IR Editor
    Date Deposited: 23 Sep 2020 11:48
    Journal or Publication Title: Journal of Pest Science
    Publisher: Springer
    Refereed: Yes
    URI:

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