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Articles by B.N. Iloba
Total Records ( 5 ) for B.N. Iloba
  B.N. Iloba and S.B.A. Umoetok
  The development of Callosobruchus maculatus F. on five grain legumes-Calopogonium mucunoides Desv., Centrosema pubescens Benth, Desmodium intortium (Mill) Urb., Flemingo congesta (Vestita Benth ex Barker) and Pureria phaseoloides (Roxb) Benth used as cover crops in Oil-Palm Plantations in Nigeria was studied under laboratory conditions. Vigna unguiculata L. Walp seed was used as control. Each of the six leguminous seeds was infested with five males and five females of C. maculatus. The treatments were arranged on a laboratory bench in Complete Randomised Design (CRD). V. unguiculata had the highest geometric mean diameter of 78.85 mm and 1000 seed mass of 283.33 g, followed by C. pubscens with 3.35 mm and 33.334.71 g seed mass. Eggs were laid on five of the species except D. intortium and the number increased with increase in seed size. The number of eggs laid was significant (p = 0.05) and ranged from 123.2 in V. unguiculata, F. congesta 63.5 and C. mucunoides 36.7, C. pubesens 18.2 and P. phaseoloides 17.2. Although development was complete in F. congesta, only miniature adults measuring 2.6 mm were produced while C. maculatus adults on V. unguiculata measured 3.9 mm. Development from egg to adult took 252 days in V. unguiculata and 331.5 days in F. congesta while it did not go beyond the third larval instar in P. phaseoloides. For management of C. maculatus, C. mucunoides, C. pubescens, D. intortium and P. phaseoloides are recommended for use as cover crops since they are not alternative host plants of C. maculatus.
  B.N. Iloba and A.P. Odon
  Soil microarthropods influence vital ecosystem processes such as decomposition, microbial spore dispersal and nutrient mineralization. Based on evidence that these micro species thrive best in moisture rich environment, this study was carried out in the rainy season. With all other physiochemical parameters relatively constant, responses of these soil microarthropods to three varying concentrations of crude oil spills within the same environment was viewed. A total of 314 soil microarthropods were collected in the crude oil spilled areas over 3 months. While the control site recorded high indices of biodiversity and species richness, the disturbed sites recorded low values with the highest species population size in the site with the lowest spill and vice-versa. Basically, results show that the crustaceans were the most sensitive species, The acarina were the most resistant and dominant while the collembolans were the most resilient groups of soil microarthropods to varying concentrations of the crude oil spills. However, the perturbation also influenced microbial populations as the control site had the highest aerobic viable count while the site with the highest spill had the lowest count.
  B.N. Iloba and I.E. Jarrett
  An ecological study of the effect of various quantities of crude oil spills on the soil microarthropod fauna was conducted. Three stations P.Q and R were polluted with 0.5, 1.5 and 3.0 L, respectively. The control station C, was not polluted. A total of 553 microarthropods were collected for a period of 6 months. The microarthropod populations collected were classified into 3: Insecta, Acari and Myriapoda which were further divided into 13 families, Soil pH, temperature, moisture content and Total Hydrocarbon Content (THC) were measured. Abundance of microarthropods correlated positively with increasing moisture content and pH and negatively with increasing THC and temperature in the upper 10 cm of soil in stations P, Q and R. Of the total microarthropod, the Acarina and hymenopterans were the most abundant groups. The least abundant were the Isopterans and Myriapods.
  B.N. Iloba and T. Ekrakene
  The powders of the leaves of Hyptis suaveolens, Azadirachta indica and Ocimum gratissimum were evaluated for comparative effectiveness in controlling Sitophilus zeamais Mots infesting stored maize grain (Zea mays) and Callosobruchus maculatus Fab infesting stored cowpea seeds (Vigna unguiculata). The powders were tested at 1.5, 2.5 and 3.5/80 g of the respective food materials. The parameters compared were adult mortality rate and emergence. The three plants tested showed more adult mortality and adult emergence of C. maculatus, where percentage adult mortality ranged from 83.3 to 93.4% for A. indica; 86.7 to 90.0% for O. gratissimum; 93.4 to 96.6% for H. suaveolens while S. zeamais recorded 13.3 to 50% for A. indica; 26.7 to 50% for O. gratissimum and 13.3 to 30% for H. suaveolens with the powders. The controls showed 0 to 33.4% mortality for C. maculatus compared with 0 to 3.3% obtained in S. zeamais within the same period. After 42 days post treatment adult emergence indicated that more C. maculatus ranging from mean number of 13 to 68 emerged while S. zeamais recorded 11 to 37 within the same period of consideration. The statistical analysis indicated that where significant differences occurred, it was caused by plant type other than concentration. The performance of individual plant type revealed that O. gratissimum and A. indica were better against S. zeamais than H. suaveolens where they caused mortality ranging from 13.3 to 50% with H. suaveolens recording 13.3 to 30.0%. However, the mortality ability of H. suaveolens against C. maculatus was better with a mean percentage mortality range of 93.3 to 96.6% compared with 83.3 to 90.0% caused by O. gratissimum and A. indica. The general emergence trend also indicated that H. suaveolens performed better in reducing emergence of new adults. These suggest that botanical insecticides are promising and their effectiveness varies with species.
  B.N. Iloba , S.B.A. Umoetok and S. Keita
  The control of Callosobruchus maculatus F. on cowpea seeds was studied in the laboratory using Dinarmus basalis Rendani as parasitoid. Five pairs of adult C. maculatus were allowed to oviposit onto ten sets of cowpea seeds. Five pairs of D. basalis were introduced at 3 days intervals (beginning from the 6th day after oviposition) into each of the nine sets of seeds. No D. basalis was introduced into the tenth set (control). No significant differences (p 0.05) were observed in the number of eggs laid per female C. maculatus in all the sets and this ranged from 37.80-41.20. No significant (p 0.05) differences were observed on adult C. maculatus that emerged when D. basalis was introduced at the 6, 9 and 12th Day After Oviposition (DAO). Percent emergence was 0.59, 0.53 and 1.85% at 6, 9 and 12st day, respectively. C. maculatus emergence increased from 67.81% in the treatment that was inoculated on the 21st DAO to 74.48 % on the 30th DAO. The total D. basalis per female in each culture was 12.81 and 17.56% on the 6 and 15th day and decreased significantly to 11.78% when inoculation was done on the 30th day. Percentage mortality of C. maculatus increased from 25.52 to 99.48% on the parasitised culture compared to 25.03 in the control. The time of introduction of the parasitoid critically affected the mortality of C. maculatus. Thus, introduction of D. basalis during the larval stage of C. maculatus caused higher mortality of the pest and had no effect on adult C. maculatus.
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