Trap attributes influencing capture of Diabrotica speciosa (Coleoptera: Chrysomelidae) on common bean fields

Abstract

Refinements in trap characteristics may improve ability to monitor and mass-trap beetles. Field assays were conducted in common bean fields to assess responses of Diabrotica speciosa (Germar) to some trap characteristics. Golden yellow plastic cups (750 mL) traps caught more D. speciosa females and males than did clear traps. Carrot slices in Petri dishes baited with Lagenaria vulagaris L. powder (cucurbitacin source -0.28%) caught more beetles than did dishes with carrot alone. Dispensers for the floral volatile attractant 1,4-dimethoxybenze were also compared. Rubber septa dispenser attracted more beetles than did control (dental wicks saturated with acetone). Captures on dental wick, starch matrix and feminine pad dispensers were intermediate and did not differ from those on rubber septa and unbaited controls. Perforated bottle traps (2000 mL), when baited with the floral attractant, caught more beetles than did window bottle traps (both traps contained L. vulgaris powder) in most assessments done from two to ten days after trap placement in the field. Traps with the insecticide carbaryl captured more beetles than did traps without it, 2-4 and 8-10 days after trap placement in the field, but not in the remaining periods (0-2, 4-6 and 6-8 days). Traps baited with 1,4-dimethoxybenzene captured more beetles than did the unbaited ones in all assessments (each other day from two to ten days after trap placement in the field). Finally, similar amounts of beetles were captured using plastic bottle traps (2000 mL): perforated, window (both with cucurbitacin) and sticky (without cucurbitacin) traps, when were baited with the floral attractant. Key words: attractant, feeding stimulant, semiochemical, integrated pest management ATRIBUTOS DA ARMADILHA INFLUENCIAM CAPTURA DE Diabrotica speciosa (COLEOPTERA: CHRYSOMELIDAE) EM FEIJOEIRORESUMO: Refinamentos em caraterísticas de armadilhas podem incrementar sua habilidade para monitorar e capturar em massa os insetos. Experimentos foram conduzidos em lavoura de feijoeiro para verificar as respostas de Diabrotica speciosa (Germar) a algumas características de armadilhas. Armadilhas de copos plástico (750 mL) amarelo ouro capturaram mais fêmeas e machos de D. speciosa do que transparentes. Placas de Petri com pedaços de cenoura, com pó seco de purungo, Lagenaria vulgaris L. (fonte de cucurbitacina -0,28%) capturaram mais insetos do que placas com somente cenoura. Liberadores para o atraente floral 1,4-dimetoxibenzeno foram também comparados. Liberador de septo de borracha atraiu mais insetos do que o controle (flocos dentais saturados com acetona). Capturas nos tratamentos com liberadores de floco dental, matriz borato e absorvente higiênico foram intermediárias mas não diferiram da testemunha e septo. Modelo de armadilha de garrafa (2000 mL) furada capturou mais insetos do que armadilha vazada ("janelas") (ambas contendo pó seco de purungo) na maioria das avaliações, dos dois até os dez dias após a instalação das armadilhas no campo. Armadilhas com inseticida carbary...

Responses of Diabrotica speciosa to a semiochemical trap characteristics

“…The lack of difference between golden yellow versus transparent traps for D. speciosa (Table 1) do not corroborate previous study in which golden yellow was clearly more attractive (Ventura et al, 2005). However, the authors used a different trap (750 mL plastic cups coated with insect adhesive without semiochemicals) what could explain the differences in the results.…”

“…Although suitable for monitoring, the magnitude of the captures was insufficient to control the pests. In a more recent study, Ventura et al (2005) evaluated methods of luring insects to traps (color, volatile attractant), design of volatile attractant dispenser and trap entry ports, and means of retaining trapped insects (cucurbitacin, insecticide and adhesive). Traps must be cheap and user-friendly to be widely adopted by farmers (Whitworth et al 2002).…”

“…Hence, aiming to improve efficiency and reduce costs some assays were carried out in common bean and corn fields. Trap colors in the best design established before were compared (Ventura et al 2005); the interactions of transparent green and yellow traps with the volatile attractant 1,4-dimethoxybenzene and the influence of four sizes of bottle traps in the captures of D. speciosa. Ventura et al 2005).…”

“…Trap colors in the best design established before were compared (Ventura et al 2005); the interactions of transparent green and yellow traps with the volatile attractant 1,4-dimethoxybenzene and the influence of four sizes of bottle traps in the captures of D. speciosa. Ventura et al 2005). One small cut was made 7.5 cm height to put water and to remove insects when their number was recorded.…”

Biology and Management of Pest Diabrotica Species in South America

“…These include lacing bitter cucurbit roots or fruit with an insecticide [128,143,144], using the roots or fruits in traps for monitoring and collecting Luperini [10,[145][146][147][148], bitter cucurbit juice formulations combined with fungal pathogens [149], and in toxic baits [150][151][152][153][154][155]. Cucurbitacins have also been included as baits in traps for monitoring purposes [10,145,147,156,157].…”