Toxicity and repellent potential of acetone, n-hexane and methanol extracts of the leaves of the medicinal plant,
Morinda lucida (Benth.) against Callosobruchus maculatus (F.) was evaluated at 10, 15, 20 and 25% treatment
levels. Adult mortality and repellent tests were monitored daily for 4 days while result of ovicidal test was recorded
at 35 days after treatment. The results obtained showed that toxicity was concentration and exposure perioddependent,
n-hexane extract being the most toxic to adult C. maculatus by causing 100% adult bruchid mortality at
25% treatment level within 3 day exposure period. All concentrations of the plant extracts applied were able to cause
significant (p<0.05) adult mortality of the bruchid beetle. All the treatment levels evaluated were able to repel adult
C. maculatus from the cowpea seed. All concentrations of n-hexane extracts caused 100% egg mortality while
acetone and methanol extracts caused 100% mortality of eggs at 15, 20 and 25% concentrations. The results
obtained in this study indicate that extracts of the leaves of M. lucida would be effective in protecting cowpea seed
against C. maculatus.
Keywords: Toxicity, ovicidal potential, repellent potential, Callosobruchus maculatus, Morinda lucida, mortality
PAPER TITLE :INSECTICIDAL AND REPELLENT ACTIVITIES OF THE LEAF EXTRACTS OF MORINDA LUCIDA AGAINST COWPEA BEETLE, CALLOSOBRUCHUS MACULATUS (COLEOPTERA: CHRYSOMELIDAE)
FUTA JOURNAL OF RESEARCH IN SCIENCE | VOLUME 9 NUMBER 1 2013
Paper Details
- Author(s) : O.E. Ajayi
- Abstract:
