Abstract
Greenhouse and laboratory studies were conducted to evaluate feeding activity and superficial damage to soybean seed by the brown-winged stink bug, Edessa meditabunda (F.), and the Neotropical brown stink bug, Euschistus heros (F.). Soybean plants (cv. BRS 282), at R6 stage of development were used. Thirty pairs of each species were used individually for 48 h. Two daily observations (9:00 AM and 3:00 PM) were taken to record the number of bugs (feeding/resting) on plant parts. Harvested seeds imbibed in tetrazolium solution were photographed for measurement of the damaged surface. Adult E. meditabunda significantly preferred soybean stems (19.7 bugs) to pods (2.7). Feeding/resting was similar at 9:00 AM (mean number of 28.0 bugs) and 3:00 PM (24.3). Euschistus heros equally fed/stayed on stems (7.3 bugs) and pods (6.9), although most bugs (12.3) remained on the cage net; feeding/resting on all plant structures amounted to 13.7 bugs at 9:00 AM and 17.7 bugs at 3:00 PM. Amylase activity was greater for E. heros (41.61 ± 0.89 U/mg) and almost none for E. meditabunda (2.35 ± 0.14 U/mg). The superficial damage to seeds was significantly greater for E. meditabunda (22. 9 mm2) compared to E. heros (12.5 mm2). However, E. meditabunda caused less shrinkage of the seed tegument, while E. heros damage was deeper and seeds showed reduction in size.
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Acknowledgments
We thank Paula L Mitchell, Winthrop University, USA, Paulo RVS Pereira, Embrapa Trigo, Brazil, and three anonymous reviewers for critically reading the manuscript. We also thank Walter Terra, University of São Paulo for the laboratory support in the salivary enzyme analysis. This research was supported by a scholarship to FACS, JJS, and RAD and research funds to ARP, from the National Council for Scientific and Technological Development (CNPq), Brazil.
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Edited by Fernando L Cônsoli – ESALQ/USP
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Silva, F.A.C., da Silva, J.J., Depieri, R.A. et al. Feeding Activity, Salivary Amylase Activity, and Superficial Damage to Soybean Seed by Adult Edessa meditabunda (F.) and Euschistus heros (F.) (Hemiptera: Pentatomidae). Neotrop Entomol 41, 386–390 (2012). https://doi.org/10.1007/s13744-012-0061-9
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DOI: https://doi.org/10.1007/s13744-012-0061-9