Biological activity of 1,8 cineole, a major component of essential oil of Ocimum kenyense (Ayobangira) against stored product beetles

Abstract

The efficacy of I ,8 cineole as repellent, toxicant and grain protectant against Sitopldus granarius, S. zeamuis, Triholium castaneunz and Prostephanus truncatus was investiaged in the laboratory using contact toxicity, grain treatment and repellency assays. 1,8 cineole applied topically or imprenated on filter paper, whole wheat as well as maize grains was highly toxic to all the four beetle species. Beetle mortality was dose-dependent with the highest dose of 10 pl/insect evoking 100% mortalities in the beetles after 24 h exposure. 1,8 cineole was more toxic in grain than on filter paper since the lowest dosage of 0.5 pl/kg controlled all beetles exposed. There was, however, a highly significant loss of toxicity after only 24 h following treatment, irrespective of dosage applied. Development of eggs amd immature stages within grain kernels as well as progeny emergence were completely inhibited in treated grain. 1,8 cineole evoked strong repellent action against S. granarius and S. zeamuis but was moderately repellent to T. castanum and P. truncatus. The protectant potential of products derived from 0. kenyense against insect damage in traditional grain storage in Africa is discussed.

Potential of seed dusts of Jatropha curcas L., Thevetia peruviana (Pers.), and Piper guineense Schumach. against the maize weevil, Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) in storage of corn grain

“…The insecticidal activities of various plant parts and products on S. zeamais with similar trends have been reported by IVBIJARO (1983), COBBINAH & APPIAH-KWARTENG (1989), OBENG-OFORI et al (1997), ARANNILEWA et al (2006), ARAYA &EMANA (2009) andEDELDUOK et al (2012). ADEDIRE & AJAYI (1996) recorded 100% mortality of S. zeamais treated with Capsicum frutescens L. 28 DAT on maize grains.…”

Chemical Constituents and Insecticidal Activity of <i>Senna italica</i> Mill. from the Sudan

“…Di-n-octylphthalate showed potent antifouling activities against algal spore and mussel attachment [15].…”

“…None of the three extracts showed insecticidal activity against Tribolium castaneum Herbst. The insecticidal activity of the nhexane extract dependent on the active chemical principles and the gross sensitivity of the target pest to these principles [15]. The large proportion of fatty acids might have contributed to the activity of the oil against C. analis.…”

VARIACIÓN ESTACIONAL DE LA REPELENCIA DE LOS ACEITES ESENCIALES DE MONIMIACEAE SOBRE Sitophilus zeamais Motschulsky (CURCULIONIDAE)

“…Sobre 1-8 cineol como compuesto individual, Obeng-Ofori et al (1997) reportaron repelencia contra S. zeamais y S. granarius (L.), mientras Klocke et al (1987) encontraron repelencia sobre A. aegypti. Con aceites esenciales de otras plantas que también tienen 1-8 cineol como componente principal se reportó efecto contra S. zeamais (Ukeh et al, 2009), Culex pipiens molestus L. (Culicidae) (Traboulsi et al, 2005), Neotoxoptera formosana (Takahashi) (Aphididae) (Hori y Komatsu, 1997) y T. castaneum (Wang et al, 2006).…”