FUMIGATION TOXICITY OF ESSENTIAL OILS AGAINST Rhyzopertha dominica (F.) IN STORED MAIZE GRAIN

Abstract

-The Rhyzopertha dominica F. (Coleoptera: Bostrichidae) is a primary pest of stored grains in many regions of the world. In this work we evaluated the fumigant activity of essential oils of Ocimum basilicum L., Citrus aurantium L., Mentha spicata L. and Croton pulegiodorus Baill on adult R. dominica in stored maize. Tests were conducted to determine lethals concentrations (CL 50 and CL 100 ) and mortality (fumigation).The fumigation test was done in containers made of glass containing 10 individuals of R. dominica, where essential oils were applied at different concentrations: O. basilicum and M. spicata (5, 10, 15, 20, 30 and 40µL/L of air), C. aurantium (10, 20, 30, 40, 50 and 60µL/L of air) and C. pulegiodorus (0, 20, 30, 50, 70

Insecticidal Properties of Ocimum basilicum and Cymbopogon winterianus against Acanthoscelides obtectus, Insect Pest of the Common Bean (Phaseolus vulgaris, L.)

“…The proportion of main components obtained in O. basilicum oil, were similar to those described by Kim et al [43] and Souza et al [35]. The genus Ocimum , belonging to the family Lamiaceae, has been investigated with regard to its insecticidal properties against diverse insect pests [35,44,45,46].…”

“…The essential oil of O. basilicum was principally composed by the aromatic ether Estragol (74.0%) and the terpene with alcohol group Linalool (17.8%), which are known to have repellent and toxic activities against stored product insect [42]. The proportion of main components obtained in O. basilicum oil, were similar to those described by Kim et al [43] and Souza et al [35]. The genus Ocimum , belonging to the family Lamiaceae, has been investigated with regard to its insecticidal properties against diverse insect pests [35,44,45,46].…”

“…C. winterianus extracts have shown repellency and substantial control capacity against many species from different insect orders, such as Spodoptera exigua Hübner (Lepidoptera: Noctuidae) [30,31], Anopheles gambiae (Insecta: Culicidae) [32], and Callosobruchus maculatus Fabricius (Coleoptera: Chrysomelidae: Bruchinae) [33], the former being an important stored product pest. On the other hand, O. basilicum has confronted several storage pests, such as Sithopilus zeamais Motschulsky (Coleoptera: Curculionidae) [34] and Rhyzoperta dominica Fabricius (Coleoptera: Bostrichidae) [35], but does not show insecticidal activity against Coleoptera, a species belonging to other insect orders, such as S. exigua [31].…”

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

“…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.…”

“…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).…”