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Insecticidal activity of essential oil extracted from  Morinda lucida  was tested on pulse beetle  Callosobruchus maculatus , which is a pest that causes serious damage to several pulses. The insecticidal activity was compared with two pesticides, Phostoxin and Primo-ban-20. 120 mixed sex adult  C. maculatus  were introduced, along with 30 g of cowpeas. Four concentrations (0.40, 0.20, 0.10, and 0.05  μ g/mL) of the  M. lucida  essential oil, Phostoxin, and Primo-ban-20 were tested. Essential oil chemical composition was analyzed by GC-MS.  M. lucida  essential oil showed a high toxicological effect, producing 100% mortality after 72 hours at a dose of 0.20  μ g/mL.  M. lucida  essential oil had a potent insecticidal activity (LC 90  = 0.629  μ g/mL) compared to both pesticides, Phostoxin (LC 90  = 0.652  μ g/mL) and Primo-ban-20 (LC 90  = 0.726  μ g/mL), at 24 h. The main compounds of the essential oil were the oxygenated monoterpenoids, 1,8-cineole (43.4%), and  α -terpinyl acetate (14.5%), and the monoterpene hydrocarbons, mostly sabinene (8.2%) and  β -pinene (4.0%). Results clearly indicate that  M. lucida  essential oil can be used as an effective alternative for pulse beetle  C. maculatus  control, and it could be tested against other pulse beetles affecting Asia and Africa and throughout the world, thereby reducing use of synthetic pesticides.

Insecticidal Activity and Chemical Composition of theMorinda lucidaEssential Oil against Pulse BeetleCallosobruchus maculatus