Bioatividade de óleos essenciais sobre Zabrotes subfasciatus Boh. (Coleoptera: Chrysomelidae) em feijão-comum armazenado

Abstract

RESUMOO presente trabalho teve como objetivo avaliar a toxicidade por fumigação, o efeito repelente, o efeito na oviposição e na emergência da geração F1 dos óleos essenciais de Croton heliotropiifolius Kunth., Croton pulegiodorus Baill., Myracrodruon urundeuva Allemão e Ocimum basilicum L. sobre Zabrotes subfasciatus, em cinco doses (0,0, 5, 10, 15 e 20 μL L -1 de ar (Coleoptera: Chrysomelidae) in common beans stored ABSTRACTThe present study aimed to evaluate the toxicity by fumigation, the repellent effect, the effect on the oviposition and emergence of the F1 generation of essential oils of Croton heliotropiifolius Kunth., Croton pulegiodorus Baill., Myracrodruon urundeuva Allemão and Ocimum basilicum L. on Zabrotes subfasciatus, in five doses (0.0, 5, 10, 15 and 20 μL L -1 of air). Track fumigation the essential oils of O. basilicum and C. pulegiodorus caused 100% mortality of adults of Z. subfasciatus, at all doses except the witness. The oils of O. basilicum, C. pulegiodorus and M. urundeuva were repellents in all doses, while C. heliotropiifolius doses 20 e 5 μL were classified as neutral and other repellents. In this sense, the oils of O. basilicum and C. pulegiodorus resulted in the highest values of reduction of eggs and 100% reduction in adults emerged, featuring ovicidal effect/larvicide about Z. subfasciatus during storage. It is therefore considered that the oils of O. basilicum and C. pulegiodorus are promising in the control of populations of Z. subfasciatus, being required further studies to define the best dose to be used, as well as the best way of application.

LEAF ESSENTIAL OIL FROM Croton pulegiodorus Baill SHOWS INSECTICIDAL ACTIVITY AGAINST Sitophilus zeamais Motschulsky

“…The bioactivity of essential oils (fumigant or repellent effect) obtained from Croton species on stored bean and maize pests has been recently demonstrated. Thus, for example, in kidney beans, Silva et al (2008) found that Croton grewioides Baill essential oil had a fumigant effect on adults of Z. subfasciatus, Brito et al (2015) observed that C. pulegiodorus and Croton heliotropiifolius Kunth essential oils caused 100% mortality in adults of Z. subfasciatus at all concentrations evaluated (5, 10, 15 and 20 µL L -1 air), in addition to having a repellent effect on insects; Carvalho et al (2016) observed toxicity (fumigant effect) of Croton urucurana Baill essential oil on C. maculatus, causing mortality rates greater than 80% and effects on the biology and survival of this beetle. Similarly, in maize, Magalhães et al (2015) reported that C. pulegiodorus and C. heliotropiifolius essential oils had a repellent effect and caused zero emergence of T. castaneum, while Souza et al (2016) observed that C. pulegiodorus essential oil caused mortality rates above 70% in R. dominica, when used at higher concentrations.…”

“…These studies focus mainly on the repellent or fumigant activity of essential oils and their lethal or sublethal effects. In general, the insecticidal effect of essential oils can be attributed to their chemical composition and mode of action on insects, causing them physiological changes, behavioral disorders, and mortality (CABALLERO-GALLARDO; OLIVERO-VERBEL; STASHENKO, 2011).…”

“…The worldwide-distributed genus Croton L. (Euphorbiaceae), in turn, has proven promising for the management of insect pests of stored products (PEREZ-AMADOR et al, 2007). In Brazil, where research on insects that mainly attack beans and cereals has made important progress in recent years, it is worth mentioning the studies analyzing the effect of essential oils from various Croton species on Callosobruchus maculatus Fabricius and Zabrotes subfasciatus Bohemann (Chrysomelidae) (BRITO et al, 2015;CARVALHO et al, 2016), Tribolium castaneum Herbst (Tenebrionidae) (MAGALHÃES et al, 2015), and Rhyzopertha dominica Fabricius (Bostrichidae) (SOUZA et al, 2016).…”

CONTACT TOXICITY OF ESSENTIAL OIL OF Croton pulegiodorus BAILL ON Sitophilus zeamais MOTSCHULSKY

“…Studies have shown the potential of using essential oils as an alternative method for seed protection and control of several pests of stored products in Brazil (COITINHO et al, 2011;BRITO et al, 2015;MAGALHÃES et al, 2015;SOUZA et al, 2016;ARAÚJO et al, 2017). Essential oils present different effects on insects (SUTHISUT; FIELDS; CHANDRAPATYA, 2011; KŁYS; MALEJKY; NOWAK-CHMURA, 2017), causing biochemical, physiological, and behavioral disorders that lead to their death or affect their development and reproduction (CABALLERO-GALLARDO; OLIVERO-VERBEL; STASHENKO, 2011, CHAUBEY, 2016).…”

“…Several species of the Croton genus (Euphorbiaceae) have been evaluated due to their insecticidal potential on coleoptera and lepidoptera pests of stored products (SILVA et al, 2009;SILVA et al, 2012b;CARVALHO et al, 2016). The fumigant and repellent effects of the essential oil of Croton pulegiodorus Baill were recently proven on pests of stored common bean and maize grains (BRITO et al, 2015;MAGALHÃES et al, 2015;SOUZA et al, 2016).…”