Economic damage levels and treatment thresholds for leafminer insects in Solanum tuberosum crops. (October 2017)

• Record Type: Journal Article
• Authors: Alves, Flávia Maria; Rocha Gonring, Alfredo Henrique; Zanuncio, José Cola; de Sena Fernandes, Maria Elisa; Plata-Rueda, Angelica; Fernandes, Flávio Lemes
• Is Part Of: Crop protection. Volume 100(2017)
• Page Start: 81
• Page End: 86
• Publication Date: 2017-10
• Subjects: Conventional pest control -- Integrated pest management -- Leaf-mining fly (Diptera) -- Potato -- Potato tuber moth; Plants, Protection of -- Periodicals; 632.05
• DOI: 10.1016/j.cropro.2017.06.008
• Languages: English
• ISSNs: 0261-2194

Abstract

Abstract: Integrated Pest Management (IPM) can only result in reduced insecticide use when treatments are applied when infestations reach economic thresholds (ET) determined from economic injury levels (EIL). The objective of this study was to determine the EIL and ET for Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae) and Liriomyza huidobrensis (Burgess) (Diptera: Agromyzidae) in 8 and 11 fields of the potato cultivar 'Ágata', respectively. The EILs were calculated based on control costs, production values, control efficacy and injuries of each insect and the ETs were calculated by subtracting 20% from the EIL value, given that control measures must be undertaken before the pest populations reach the former level. The EIL for L. huidobrensis at 50 and 70 days after planting (DAP) ranged from 0.07 to 0.24 and from 0.09 to 0.32 mines per plant, respectively, and those of P. operculella at 50 DAP ranged from 0.07 to 0.24 mines per plant. The ET for L. huidobrensis at 50 and 70 DAP were 0.05–0.19 mines per plant, respectively, and those of P. operculella, 0.05 to 0.19 mines per plant at 50 DAP. These results suggest that management of these pests in potato crops should use the ET of 0.07 and 0.05 mines per plant for control decisions regarding L. huidobrensis and P. operculella, respectively. Graphical abstract: Highlights: Economic injury level (EIL) and economic threshold (ET) are parameters that can be used to reduce the costs. The EIL for the miners L. huidobrensis and P. operculella ranged 0.07 to 0.32 mines per plant. The ET for the miners L. huidobrensis and P. operculella ranged 0.05 to 0.24 mines per plant. The miners should be controlled when the density is higher than the ET.