Browsing by Author "Ojumoola, Adebayo Olusegun"

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    Effects of five improved cowpea seed genotypes on oviposition and progeny development of Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae).
    (FUTA Journal of Research in Sciences, 2014) Ojumoola, Adebayo Olusegun; Adesiyun, Adenrele Adeyinka
    This study was aimed at determining the effects of genotype differences on egg laying, larval, pupal development and adult emergence of the cowpea seed bruchid, Callosobruchus maculatus (F.). Five cowpea genotypes (SAMPEA 6, SAMPEA 7, SAMPEA 9, SAMPEA 10 and SAMPEA 11) developed by the Institute for Agricultural Research (IAR) in Samaru, Zaria, Nigeria were used. Oviposition, larval development and pupal development bioassays were carried out under ambient laboratory conditions by sampling 20 seeds at the 7th, 14th and 19th day after infestation (DAI) respectively. The number of eggs, larvae and pupae in sampled seeds were counted and recorded. Adult emergence bioassay was done by counting daily the number of emerged adults until 35 DAI when adult emergence stopped. Results from the study showed that the highest mean number of eggs (41.3), larvae (28.3), and pupae (25.7) per 20 seeds at 7DAI, 14 DAI and 19 DAI respectively occurred in SAMPEA 6. Also, more adults (80.6) were observed to have emerged from SAMPEA 6 than from any other genotype. With respect to all bioassays in this study, SAMPEA 6 was significantly different (P<0.05) from all other genotypes. On the other hand, SAMPEA 10 had the least mean number of eggs (14.0) and larvae(8.0) per 20 seeds at 7DAI and 14DAI respectively and was significantly different (P<0.05) from the other genotypes. However, at 19DAI, SAMPEA 9 was observed to have the lowest mean number of pupae (4.7) per 20 seeds and was significantly different (P<0.05) from the other genotypes. There was no significant difference (P>0.05) in the number of adults that emerged from SAMPEA 7, SAMPEA 9, SAMPEA 10 and SAMPEA 11 at P = 0.05.
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    Effects of varietal differences and severity of seed damage by Callosobruchus maculatus (F.) on the weight and germination of some improved cowpea seeds.
    (Nigerian Journal of Entomology, 2015) Ojumoola, Adebayo Olusegun; Adesiyun, Adenrele Adeyinka
    The effects of varietal differences and severity of seed damage by the cowpea bruchid, Callosobruchus maculatus, on the weight and germination of some improved cowpea seeds were investigated in a S x 4 factorial experiment laid out in a completely randomized design replicated three times. Five improved cowpea seed varieties, namely, - SAMPEA 6, SAMPEA 7, SAMPEA 9, SAMPEA 10 and SAMPEA 11, were exposed to infestation and damage by C. maculatus. The damaged seeds were sorted, based on the number of exit hole( s) in them, into - no-hole, one hole, twohole, and three-hole groups and thereafter placed on moist tissue paper in Petri dishes. The emergence of radicles and primary leaves 96 hours after placement (HAP) were used as germination indicators. SAMPEA 6 and SAMPEA 7 had the highest and lowest mean weight per seed (207.Smg and lS9.2mg) respectively and both differed significantly (P
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    Entomology in Nigeria: The past, the present and the future
    (Nigerian Journal of Entomology, 2015) Adesiyun, Adenrele Adeyinka; Omoloye, Adebayo Amos; Ojumoola, Adebayo Olusegun
    Against the backdrop of the evolution of Entomology as an important science which dates back to the establishment of Biology as a field of study, an attempt has been made in this paper to define the relevance of the science of Entomology and to enunciate its essence in the past, its potentials in the present and the prospects for the future with particular reference to Nigeria. Early entomological imprints were typified by the activities of the foundation entomologists which led to the inauguration of the Entomological Society of Nigeria (ESN) in 1965. The monumental roles played by these fore bearers at building the agricultural economy of the newly independent Nigeria positioned agriculture (through appropriate insect pest management) as the main stay ofthe nation's economy at the time. The ESN which started in lbadan as a branch has grown significantly to over 18 branches with over 600 members. The past of Entomology revealed the activities and support of expatriates mainly from Great Britain who provided the much needed national pest management services. However, this past gradually terminated and ushered in the first generation Entomologists between 1960 and 1969 with significant achievements reflected in high agricultural exports in Nigeria. The present era which commenced around 1970s till date is characteristically marked by significant explosion in the number of trained Entomologists, better organized ESN as platform for interaction and communication especially with the outside world and good practice. The future of entomology in Nigeria is very bright but would be moulded positively by several factors including improvement of entomological research funding, better mentoring, resuscitation of moribund research facilities, prominence at the national front and professionalization of the science of Entomology. National Entomologists are therefore encouraged to work hard to reposition insect science in Nigeria in order to shape the nation's collective future.
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    Fumigant effect of sweet basil (Ocimumbasilicum L) leaf essential oil on the longevity and fecundity of adult cowpea bruchid Callosobruchus maculatus (F) and on germination
    (Agrosearch, 2015) Ojumoola, Adebayo Olusegun
    Fresh pulverised leaves (00g) of Ocimum basilicum (L) were harvested in July 2014. Essential oil yield from the hydro-distilled leaves after 3 hours was 0.3(w/w) %. GC_MS analysis revealed the predominance of oxygenated monoterpenes (41.0%) in the oil. Terpinen-ol was the major oil constituent accounting for 29.8%. The essential oil (EO) vapour was used to generate an insecticidal atmosphere within airtight fumigation chambers (130mL). Each chamber contained 2 pairs of adult C. maculatus and ten seeds of Ife Brown cowpea variety. The EO was tested at 10, 20, 30 and 40 uL/130mL air. After 24 hours of exposure, the control had the lowest percentage mortality (0.00) while complete mortality was observed in both the 30uL and 40ul doses.
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    Influence of three legume seed types on development of Callosobruchus maculatus (F.) and its suceptibility to Azadirachta indica aqueous extracts
    (Agrosearch, 2018) Ojumoola, Adebayo Olusegun; Bamidele, Dorcas Adejumoke; Uddin II, Robert Omotayo
    In the absence of effective protection, grains of legumes may be completely decimated when attacked in storage by the cowpea bruchid, Callosobruchus maculatus. The use of botanical insecticides has been reported as ecologically innocuous alternatives to conventional insecticides for the control of C. maculatus in stored legume grains. This study thus investigated how legume type influenced the emergence of C. maculatus and its susceptibility to the aqeous extract of neem leaf (a botanical based insecticide). Thirty (30) C. maculatus adults from the same population were reared for 4 generations on improved varieties of cowpea (IT89KD391), mung bean (NM 92) and soybean (TGX 1448) seeds under laboratory conditions. While both cowpea and mung bean supported the emergence of adult C. maculatus in all the four filial generations studied, emergence in soybean terminated after first filial generation. Susceptibility of fourth filial generation adult beetles from cowpea and mung bean to neem leaves aqueous extracts was subsequently tested by contact application. Treated adult C. maculatus of the mung bean line were found to be significantly (P<0.05) more susceptible to the botanical extract than those of the cowpea line. It was thus concluded that cowpea and mung bean seeds are more suitable for the emergence of adult C. maculatus than soybean seeds and that its management in storage with neem leaves aqueous extract should be done bearing in mind that the type of legume being treated might influence the effectiveness of the botanical insecticide