摘要：Field experiment was conducted at the Teaching and Research Farms of Abubakar Tafawa Balewa University,
Bauchi, Nigeria during the rainy seasons of 2006. The objectives of the study were to determine the efficacy of six
plant extracts (sweetsop, chilli pepper, garlic, ginger, neem and tobacco) against the insect pests of cowpea
(variety IT86D-719) and their effects on yield. The experimental field was first ploughed, harrowed and ridged
before the commencement of the planting season. Twenty one experimental plots were demarcated and arranged
into seven treatment plots. The size of each plot was 4m x 3m while interspaces between adjacent plot and blocks
were 1m and 2m, respectively. The level of control was assessed by calculating percentage control of each
treatment. Results of the experiments showed that all the plant extract treatments were significantly better than
control treatments. Similarly, yield results corresponded positively with the effectiveness of the treatments. Results
of the present finding therefore, suggest the use of all the tested plant extracts particularly tobacco, sweetsop and
garlic as they have been found to be very promising biopesticides in the control of cowpea insect pests in Bauchi,
Nigeria.
