Navegando por Autor "Rodrigues, Millena dos Santos"

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    Influência do teor proteico da dieta na biologia de lagartas do complexo Spodoptera (Lepidoptera: Noctuidae)
    (Universidade Estadual do Norte do Paraná, 2024-02-26) Rodrigues, Millena dos Santos; Rando, Jael Simões Santos; https://orcid.org/0000-0002-5191-2996; http://lattes.cnpq.br/2794627489819518; Rando, Jael Simões Santos; https://orcid.org/0000-0002-5191-2996; http://lattes.cnpq.br/2794627489819518; Mihsfeldt, Laila Herta; https://orcid.org/0000-0001-6619-8652; http://lattes.cnpq.br/5443619889613070; Quintela, Eliane Dias; http://lattes.cnpq.br/7426637066408803
    Spodoptera frugiperda, S. eridania and S. cosmioides (Lepidoptera: Noctuidae) are polyphagous pests of economic relevance due to the damage caused to crops such as corn, soybean and cotton. For the development of control programs, knowledge of the biology and nutritional needs of insects is essential. In this context, the aim of this study was to evaluate biological parameters of S. frugiperda, S. eridania and S. cosmioides reared on artificial diets containing different protein levels under laboratory conditions (24±2 °C, 70±10% RH and 14 h photophase). Four artificial diets were used: diet described by Greene et al. (1976) (D1) and three other modified ones, with reduction of the protein components wheat germ, soy protein, brewer's yeast and powdered milk (casein), by 25% (D2), 50% (D3) and 75% (D4). The parameters evaluated were: viability and duration of the larval and pupal stages, weight of pupae at 24 h, viability and longevity of adults, fecundity and egg viability. The data were subjected to the Kruskal-Wallis non‑parametric test followed by a Bonferroni‑adjusted significance test at a significance level of 0.05. To evaluate the influence of diets with different protein contents on the number of instars of each species, the caterpillars' cephalic capsule was measured daily using a digital microscope and SFP software. Subsequently, a multimodal frequency distribution curve was plotted, followed by linear regression to confirm the number of instars. For S. frugiperda and S. eridania, diets D1 and D2 resulted in similar viabilities and biological parameters, while for S. cosmioides the most suitable diet was D1. Diets D1, D2 and D3 presented a larval stage with six instars for the three species. The artificial diet with a 25% reduction in protein content (D2) has potential for use in laboratory rearing for the species S. frugiperda and S. eridania.