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Articles by R.K.A. Egharevba
Total Records ( 3 ) for R.K.A. Egharevba
  K.E. Law-Ogbomo and R.K.A. Egharevba
  The use of some of vegetable oils (rubber seed oil, palm oil and palm kernel oil) was evaluated against cowpea weevil, Callosobruchus maculatus in three cowpea varieties (Ife white, Ife brown and Kano white). The trial involved exposing adult weevils to various levels of 0, 2.5, 5.0, 7.5 and 10.0 mL kg-1 of the oil admixed with cowpea seeds. All studies were undertaken under laboratory temperature of 28±3°C and 70±3% r.h. The results showed that all the plant oils tested have toxic effect on weevils in all cowpea varieties. The oil treatments showed significantly high (p<0.001) mortality of adult weevils (72-100%) at 10 Days after Treatment (DAT). Mean percentage adult weevils mortality in the treated grain (82.5%) was significantly higher than in the untreated control (0%). The treated grains gave adequate protection by recording lower oviposition (10.3%) than the untreated control (96.3%). Lower adult weevils’ emergence (6.3%) was also associated with the treated grains as against untreated grains (88.2%). The plant oil treatments also significantly (p<0.001) reduced weight loss (2.1%) and grain damaged (9.1%) as compared with untreated control of (48.2%) and (93.2%) in weight loss and grain damaged, respectively. There was no adverse effect of the oils on grains quality. Of the three plant oils used, rubber seed oil was the most effective. Among the varieties used in this study, Ife brown was more resistant to cowpea weevil infestation than Ife white and Kano white in that order.
  K.E. Law-Ogbomo and R.K.A. Egharevba
  Trials were conducted in 2003 and 2004 to evaluate the effect of wood ash, carbofuran and aldrin dust on the control of yam tuber beetle (Heteroligus meles) and the performance of Dioscorea rotundata. Yam vines emerged earlier from the treated setts than the untreated setts and it was much higher in carbofuran (25.3%) than wood ash (22.3%) and aldrin dust (20.4%) in that order. However, there were no significant differences among the treatments. Dry matter was much higher in carbofuran followed by wood ash and then aldrin dust. Fresh yam tubers produced by carbofuran treated setts weighed significantly more (1.97 kg stand-1) than those produced by wood ash treated setts (1.62 kg stand-1), aldrin dust treated setts (1.45 kg stand-1) and untreated setts (1.43 kg stand-1). During both years, a highly significant difference (p<0.05) existed among treatments. In 2003, the mean of beetle feeding holes was 9, 4, 2 and 11 for aldrin dust, wood ash, carbofuran and control respectively. The pattern of distribution in 2004 was not quite different from that of 2003. There was no significant difference between damage in the aldrin treated setts than the control. From the trial, it appeared that Heteroligus meles have developed insensitivity to aldrin dust and that carbofuran should be used instead since insect pests was sensitive to it while wood ash can be used as substitute to carbofuran by resource-poor farmers and when carbofuran was not available.
  R.K.A. Egharevba and K.E. Law-Ogbomo
  A study on the effect of two Nitrogen sources (NPK and Urea) on the growth and yield of two Roselle varieties was undertaken at the Faculty of Agriculture, University of Benin, Edo State, Nigeria. The treatments consisted of 2 varieties (SD, 2003 and DR, 2003) NPK 15:15:15: and Urea fertilizers at 0, 100, 150 and 200 kg h-1, respectively). Factorial combinations of the treatments were laid out in a randomized complete block design, with three replications. The results showed that there were no differences in the fertilizer types in some vegetative characters at 2, 4, 6 and 8 Weeks After Transplanting (WAT). Significant differences were however observed in plant height between the varieties at 10 WAT and for fruit number among the varieties at 10, 11 and 12 WAT, respectively. NPK 15:15:15: Fertilizer was observed to be better than urea while DR 2003 variety did well and so should be recommended for the rainforest zone of Nigeria as it performed better in all the parameters measured.
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