Populações de insetos numa fábrica de arroz e milho. Competição interespecífica como fator regulador
2015
Louro, Tiago Filipe Afonso | Carvalho, Maria Otília de Almeida | Martins, Margarida Moldão | Marques, Luís Filipe Belo
Mestrado em Engenharia Alimentar - Qualidade e Segurança Alimentar - Instituto Superior de Agronomia
Afficher plus [+] Moins [-]The present work aimed to identify the key pests of a mill factory that processes rice and maize, for risk assessment, and the effect of the interspecific competition between two primary pests in maize. For risk assessment, data were collected from a previously implemented sampling program, using traps with kairomone. The traps were observed weekly and the insects identified and counted. For interspecific competition in maize, bioassays were carried out in laboratory, and compared G1 and G2 of the two primary pests Sitophilus zeamais Motsch (Coleoptera, Curculionidae) and Rhyzopertha dominica (F.) (Coleoptera, Bostrichidae), in both isolated and competition environment of temperature and r.h. ANOVA and Tukey tests were used for data analyses. At mill factory, the key-pests were S. zeamais and Tribolium castaneum (Herbst) (Coleoptera, Tenebrionidae). There was not meaningfully differences between both populations. Although T. castaneum follow the temperature fluctuations while S. zeamais might be present when the environmental conditions are not favorable for its activity. Bioassays on maize showed that S. zeamais was the dominant species. When growing in competition the presence of both species might reduce the populations between 50% (R. dominica) and 83, 8% (S. zeamais), developing a regulatory factor on insects population
Afficher plus [+] Moins [-]Mots clés AGROVOC
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