Entomocidal Efficacy of Crude Oil and Fractions of Mormodica charantia (l) Oil Extract Against Cowpea Bruchid Callosobruchus maculatus (Fab) Infesting Stored Cowpea Seeds

• M. O. Oni

  Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

  Author

• B. Oyawoye

  Department of Biochemistry, Federal University of Technology, Akure.

  Author

• R.A. Adebayo

  Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

  Author

• T.I. Ofuya

  Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

  Author

• O.C. Ogungbite

  Department of Plant Science, University of Ado-Ekiti, Ado- Ekiti. Nigeria

  Author

The entomocidal potency of crude and different fractions of Momordica charantia oil extracts was evaluated under laboratory condition 28± 2 C and relative humidity of 75± 5%. Bioassay of crude oil and different fractions 1;2;3;4;5;6;7;8 and 9 of the plant oil extracts was conducted for its insecticidal efficacy against Callosobruchus maculatus (Fab.) at 10, 20, 30, 40 and 50µl dosages/20g cowpea seeds. All the treatments were potent against the survival of the test beetles as dosages increase with increase in time of exposure. Likewise, it was evident that Fraction 3 appeared to be the most effective as they caused 100% beetle mortality at 96 hours post-treatment. Probit analysis showed that Fraction 3 of the plant oil extract required 40.67 and 71.15µl to achieve50 and 95% highest insect mortality within 48hours. Fraction 3 of M. charantia oil extract of the oil that may possibly have equally played the observed bioactivity accountable for the repellence activity of the beetle by the fraction. However, it is imperative to confirm the active ingredient present in the plant oil fraction and examine its toxicity to mammals.

1. M. O. Oni, Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

   Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

2. B. Oyawoye, Department of Biochemistry, Federal University of Technology, Akure.

   Department of Biochemistry, Federal University of Technology, Akure.

3. R.A. Adebayo, Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

   Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

4. T.I. Ofuya, Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

   Department of Crop, Soil and Pest Management, Federal University of Technology, P. M. B. 704, Akure. Nigeria.

5. O.C. Ogungbite, Department of Plant Science, University of Ado-Ekiti, Ado- Ekiti. Nigeria

   Department of Plant Science, University of Ado-Ekiti, Ado- Ekiti. Nigeria

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