Abstract
The understanding of relationships between insects and host plants at their trophic levels is one of the greatest challenges to the ecological field. The objective of this study was to identify the influence of host plant species and clump diameters on the population density of phytophagous pentatomids. The study was carried out during the soybean and maize off-season in 2014, 2015 and 2016 at the Experimental Area of the University of Cruz Alta, Cruz Alta, RS. Host plants with different clump diameters of the species Chloris distichophylla (5, 10, 15, 20, and 25 cm), Andropogon bicornis, and Erianthus angustofolium (10, 20, 30, 40, and 50 cm) were evaluated. For each diameter of each plant species 10 experimental units were sampled per year, totaling 150 experimental units of each plant species at the end of three years. The diameter of host plant has direct influence on the phytophagous pentatomids. No significant differences were found among the host plants at the end of the three years of evaluations for the population of phytophagous Pentatomids.
Highlights
The understanding of relationships between insects and host plants at their trophic levels is one of the greatest challenges to the ecological field
Durante a pesquisa foram quantificados 6.297 insetos de seis espécies diferentes de pentatomídeos: Euschistus heros (Fabricius 1798), Dichelops furcatus (Fabricius 1775), Edessa meditabunda (Fabricius 1974), Edessa ruformaginata (De Geer 1773), Dichelops melacanthus (Dallas 1851) e Piezodorus guildinii (Westwood 1837) (Tabela 1)
R. Interactions of selected species of stink bugs (Hemiptera: Heteroptera: Pentatomidae) from leguminous crops with plants in the neotropics
Summary
RESUMO: A compreensão das relações entre insetos e plantas hospedeiras em seus diversos níveis tróficos é um dos maiores desafios para a pesquisa ecológica. Este trabalho teve por objetivo identificar a influência de espécies de plantas hospedeiras e diâmetros de touceira sobre a densidade populacional de pentatomídeos fitófagos. Plantas hospedeiras com diferentes diâmetros de touceira das espécies Chloris distichophylla (5, 10, 15, 20 e 25 cm), Andropogon bicornis e Erianthus angustofolium (10, 20, 30, 40 e 50 cm) foram avaliadas. Para cada diâmetro de cada espécie de planta foram coletadas 10 unidades experimentais por ano, totalizando 150 unidades experimentais de cada espécie de planta ao final dos três anos. O diâmetro da planta hospedeira tem influência direta sobre as populações de pentatomídeos fitófagos. Ao final dos três anos de avaliação, não houve diferenças significativas para a população de pentatomídeos fitófagos
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