Density and spatial distribution of different development stages of Sternechus subsignatus Boheman (Coleoptera: Curculionidae) in soybean crops |
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| Affiliation: | 1. Estación Experimental Agroindustrial Obispo Colombres (EEAOC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA), Av. William Cross 3150, C.P. T4101XAC, 4101, Las Talitas, Tucumán, Argentina;2. Centro de Estudios Parasitológicos y de Vectores (CEPAVE), Universidad Nacional de La Plata, Calle 2 N° 584, 1900, La Plata, Argentina;3. Estación Experimental Agroindustrial Obispo Colombres (EEAOC), Argentina;1. State University of Montes Claros, Department of Agricultural Sciences, Reinaldo Viana Street, 2630, 39440-000 Janaúba, MG, Brazil;2. State University of Montes Claros, Department of Biology, University Campus Professor Darcy Ribeiro, CP: 126, 39401-089 Montes Claros, MG, Brazil;3. Laboratory of Food Irradiation and Radioentomology, State University of São Paulo/CENA, Centenário Avenue, 303, 13416-000 Piracicaba, SP, Brazil;1. Department of Geography and Regional Research, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;2. Environment Agency Austria, Spittelauer Lände 5, A-1090 Vienna, Austria;3. Department of Conservation Biology, Vegetation and Landscape Ecology, University of Vienna, Rennweg 14, A-1030 Vienna, Austria;4. Department of Geography, University of Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany;5. BayCEER, University of Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany;1. University of Brasília, Campus Darcy Ribeiro, Brasília, DF, Brazil;2. University of Brasília, Campus Planaltina/FUP, Planaltina, DF, Brazil;3. Departamento de Diversidade e Ecologia, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil;4. Setor de Paleontologia, Museu de Ciências e Tecnologia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil;5. Marília Paleontological Museum, Marília, SP, Brazil;1. Institute of Microelectronics and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan;2. Department of Electrical Engineering, Kun Shan University, Tainan 710, Taiwan;3. Department of Optoelectronics Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan;4. Department of Electronic Engineering, Cheng Shiu University, Kaohsiung 833, Taiwan |
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| Abstract: | The population recruitment and the spatial distribution of eggs, larvae, overwintering stages and adults of the soybean stalk weevil, Sternechus subsignatus Boheman, on soybean were estimated in two commercial farms of the Tucumán province, Argentina, during three consecutive productive cycles. At weekly intervals 30 sampling units were taken in a random distribution from each farm, and the number of adults as well as the number of “rings” and gall-like structures around stems and/or branches recorded, from which the number of eggs and larvae, respectively, were inferred. At fortnightly intervals 20 sampling units of soil were taken at random and the number of overwintering stages recorded. The recruited number of the different developmental stages was analyzed by nested ANOVA, and the spatial distribution was estimated by the Taylor's Power law and Iwao's regression methods. Adults were recorded in all samples while eggs and larvae were found from mid-January to late April. The recruited number of the different stages was low and did not differ between stages or farms, and the spatial disposition of all developmental stages was at random. This study constitutes the first of its kind for this pest, and provides information that will be useful for the purposes of monitoring for biological studies and for insect pest control in the field. |
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| Keywords: | Soybean stalk weevil Spatial pattern Density Plant protection |
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