Antixenosis and Tolerance to Diabrotica speciosa (Coleoptera: Chrysomelidae) in Common Bean Cultivars

• Published in: The Florida entomologist Vol. 98; no. 2; pp. 464 - 472
• Main Authors: Júnior, Arlindo Leal Boiça, Costa, Eduardo Neves, Souza, Bruno Henrique Sardinha de, Ribeiro, Zulene Antônio, Augusto Morais Carbonell, Sergio
• Format: Journal Article
• Language: English
• Published: Lutz Florida Entomological Society 01-06-2015; The Florida Entomological Society
• Subjects: Adult insects; Adults; Aerial parts; Antixenosis; beans; Chrysomelidae; Coleoptera; Common beans; Control; corn rootworm; crops; cultivars; Diabrotica speciosa; ecosystems; Entomology; escarabajo de hoja; Fabaceae; Fabales; Feeding preferences; greenhouses; gusano de la raíz del maíz; host plant resistance; Insect larvae; insect pests; Insect resistance (Plants); larvae; Larval development; leaf beetle; leaves; manejo de plagas; no preferentes; non-preference; pest management; pesticide application; Phaseolus vulgaris; Phaseolus vulgaris L; Physiological aspects; Plant growth; Plants; RESEARCH PAPERS; resistencia genética a los insectos; root systems; testing; Brazil
• ISSN: 0015-4040; 1938-5102
• DOI: 10.1653/024.098.0212

Diabrotica speciosa (Germar, 1824) (Coleoptera: Chrysomelidae) is a polyphagous insect pest that attacks several crops of agricultural importance including common beans (Phaseolus vulgaris L.; Fabales: Fabaceae). Diabrotica speciosa larvae feed on the plant root system whereas the adults are leaf defoliators. Diabrotica speciosa control relies mainly on pesticide applications resulting in ecosystem contamination and other problems. This research aimed to identify common bean cultivars that express antixenosis to D. speciosa adult feeding and/or tolerance to larval injury, as well as to determine the resistance levels of the cultivars. To evaluate antixenosis, 10 common bean cultivars were tested for D. speciosa adult feeding preference in free-choice and no-choice tests. The cultivars were ‘IAC-Una’, ‘Diamante Negro’, ‘IAC-Diplomata’, ‘FT-Nobre’, ‘Ônix’, ‘IAC-Uirapuru’, ‘IPR-Tiziu’, ‘BRS-Explendor’, ‘IAC-Maravilha’ and ‘BRS-Supremo’. Then, 6 cultivars were selected from the adult feeding assay and used in tests that assessed their tolerance to injury by D. speciosa larvae. In the free-choice test, the cultivars ‘IAC-Una’ and ‘IAC-Uirapuru’ were the least preferred by D. speciosa adults for feeding, whereas the cultivars ‘IAC-Diplomata’ and ‘Ônix’ were the least preferred in the no-choice test. The ‘Ônix’ and the ‘IAC-Una’ cultivars had the lowest reductions in plant height and dry weight of the aerial part after injury by D. speciosa larvae; the cultivars ‘BRS-Explendor’ and ‘IAC-Diplomata’ had intermediate reduction percentages; and the other cultivars were susceptible to injury by D. speciosa larvae. Field studies should evaluate the performance of the cultivar ‘Ônix’ infested with adults and larvae of D. speciosa in order to confirm the promising results obtained in the current study under laboratory and greenhouse conditions.