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Background Coptotermes sjostedti  Holmgren (Isoptera:Rhinotermitidae) is one of the major termite species found infesting woods and other plant materials in Africa. Bioassays were carried out at the Arboretum of the Department of Forestry and Wildlife Resources Management, University of Calabar, Nigeria to investigate the effect of oils from the kernel of  Jatropha curcas  L. and  Azadirachta indica  oils A. Juss against the African subterranean termite ( Coptotermes sjostedti  Holmgren). Treatments comprised of the plant oils and Solignum (a synthetic termiticide, serving as positive control) applied at the rate of 5, 10 and 15 mL per 100 cm 3  of the wood from seven plant species. Untreated woods also served as control. Seven wood species were placed in a test arena and artificially infested with 50 termites per unit. The setup was a randomized complete block design with four replicates. Data on termite mortality and wood weight loss were recorded. Results The use of 10 and 15 mL of  J. curcas  oil caused more than 90% mortality of  C. sjostedti , after 96 h, kept wood consumption by the insect below 6.0% after 3 months, and these outcomes were similar to that of Solignum at the same concentrations. About 35.0–65.2% reduction in weight was observed among untreated woods from the tested woods, indicating their susceptibility to  C. sjostedti  attacks. Correlation analysis shows a significant ( r  &gt; − 0.900;  P  &lt; 0.0001) negative association between termite mortality and the  rate of wood consumption. Conclusion The use of  J. curcas  oil at 10 mL per 100 cm 3  of wood could be a potent alternative to Solignum for the control of  C. sjostedti .

Termiticidal activity of oil from Jatropha curcas L. and Azadirachta indica A. Juss against Coptotermes sjostedti Holmgren (Isoptera: Rhinotermitidae)