IJFSNPHT 2017 Volume 9 Issue 7

International Journal of Food Safety, Nutrition, Public Health and Technology (IJFSNPHT) ISSN: 0975 – 8712

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Field evaluation of extracts of four selected plants for the Management of Maruca vitrata Fab on  Cowpea Vigna  unguiculata  L. Walp.

Authors & Affiliation:
Ugwu J. A,1 Umeh V.C2 and Omoloye A. A3 
1 Federal College of Forestry, Ibadan, Forestry Research Institute of Nigeria  PMB 5087, Jericho, Ibadan. Oyo State, Nigeria.
2 National Horticultural Research Institute, P.M.B. 5432, Idi-Ishin, Jericho, Reservation Area, Ibadan, Nigeria.      
3 Department of Crop Protection and Environmental Biology, University of Ibadan. Nigeria. 

The insecticidal effectiveness of petroleum ether seed extracts of four plants namely Azadiratcha indica, A.Juss, Piper guineense Schum and Thonn ,Annona muricata  L. and Jatropha curcas L. were assessed  in the  field  for the management  of  legume pod borer (Maruca vitrata Fab) on cowpea during the  rainy season of year 2014. The experiment was laid out in a Randomized Complete Block Design (RCBD) in six replications. The extracts were applied at the rate of 10ml/1l of water at weekly intervals for twelve weeks and compared with Lambdacyhalothrin at 5ml/10l of water as a standard check and untreated control. The results showed that all the treatments significantly (p <0.05) reduced the population of legume pod borer compared to control.  Annona muricata followed by Piper guineense significantly (p<0.05) reduced the population of legume pod borer compared to other extracts. The percentage reduction of M. vitrata population ranged from 37% - 80% compared to control.  Consequently, the number of damaged pods was significantly (p<0.05) lower on plots treated with A. muricata, followed by P. guineense. Cowpea yield was significantly (p<0.05) higher in plots treated with A. muricata and Piper guinense compared to other extracts. The four extracts evaluated were significantly (P<0.05) more effective than Lambdacyhalothrin in reducing M. vitrata population on cowpea in the field. Therefore, the utility of these plant extracts in pest management should be fully adopted by farmer since they are widely available in Nigeria, devoid of human or environmental hazards, ease in application and relatively cheap
Key words: Cowpea. Plant extracts, Maruca vitrata,  Pest management