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Articles by K.E. Law-Ogbomo
Total Records ( 4 ) for K.E. Law-Ogbomo
  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 D.A. Enobakhare
  The efficacy of rubber seed oil, palm oil and palm kernel oil as maize grain protectants against Sitophilus zeamais was tested on three maize varieties [‘Uselu’ local, SUWAN-1 and Oba Super 1 (8321-18) using a 3x5x3 factorial arrangement in a Randomized Complete Block Design. There were four replications of each of the vegetable oils using application levels of 0, 2.5, 5.0, 7.5 and 10.0 mL kg 1 maize grain. All studies were undertaken under laboratory temperature of 28±3% rh. Fifteen sexed adult insects were used for each replicate. In all the treatments, a range of significant percentage mortality of adult weevils (55-93%) at 21 days after treatment was obtained (p<0.05). Mean percentage adult weevil mortality in treated grain (70.5%) was significantly higher than in the control (0.0%). The treated grains gave adequate protection by having lower oviposition (19.8%) than the untreated control (94.5%). This was also observed to have lower adult weevil emergence (8.9%) than the untreated control (85.3%). The vegetable oils gave appreciable reduction in percentage weight loss (2.2%) when compared with the untreated control (47.3%) and had no adverse effects on grain quality. From the study, the plants could be ranked in order of effectiveness thus: rubber seed oil > palm oil> palm kernel oil. The "Uselu" local was found to be more resistant to maize weevil infestation than the improved varieties (SUWAN-1) and Oba super 1 (8321-18).
  K.E. Law-Ogbomo
  The efficacy of three plant oils (rubber seed oil, palm oil and palm kernel oil) in reducing post harvest loss caused by Callosobruchus maculatus (F.) in three cowpea varieties (Ife white, Ife brown and Kano white) was determined in the laboratory at 30+0.30°C and 61+0.32% r.h. Each of the plant oils was tested by exposing adult weevils to various levels of 0, 2.5, 5.0, 7.5 and 10 mL kg-1 admixed with cowpea grains in four replications. Each experimental unit had fifteen sexed adult insects. All the plant oil treatments recorded significantly high (p<0.05) mortality of adults (70-96%) at 7 Days After Treatment (DAT). Percentage weevil mortality in treated grain was significantly higher than in control. The plant oils gave appreciable percentage reduction in percentage weight loss (0.1-1.7%) when compared with the untreated control (48.2%). Significant reduction in percentage punctured grain (0-32%) versus 93.2% in control and has no adverse effects on seed viability. However, among the treatments, rubber seed oil at 10 mL kg-1 grain was the most effective in reducing post harvest weight loss (0.1%). The Ife brown was more resistant to Callosobruchus infestation than Ife white and Kano white. A combination of rubber seed oil with Ife brown at the rate of 10 mL kg-1 grain gave the most effective reduction in Callosobruchus population and damage.
  K.E. Law-Ogbomo and D.A. Enobakhare
  In this trial, some aspects of the biology: oviposition, development, survival, fecundity and damage cause by Sitophilus oryzae on stored rice and the control of the weevil, using leaf powders of Ocimum gratissimum and Vernonia amygdalina were studied under ambient laboratory conditions (temperature range 28-30°C and 60-77% relative humidity). Toxicity tests consist of exposing adult weevils to various levels of 0, 1, 2, 3, 4 and 5 g per 20 g grain. The leaf powders were admixed with rice grains. The results showed that the tested leaf powders have insecticidal activities. Based on the percentage mortality, number of egg laid, number of emerged adult, percentage weight loss and percentage punctured grain. The trial also revealed that Ocimum gratissimum was more effective than Vernonia amygdalina as stored grain protectants at all dosage level of application.
 
 
 
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