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Abstract African cassava mosaic virus (ACMV) has been identified as a typical example of a pathogenic microorganism that constitutes a global menace to cassava's profitable production, especially in Africa, where the highest economic... more
Abstract African cassava mosaic virus (ACMV) has been identified as a typical example of a pathogenic microorganism that constitutes a global menace to cassava's profitable production, especially in Africa, where the highest economic yield loss of 34 million tons usually is recorded annually. Functional analysis of virus coat proteins based on evolutionary processes and structure of ACMV isolates from fifteen African countries was conducted with Indian cassava mosaic virus and East African cassava mosaic Malawi virus as checks. The study revealed that ACMV coat proteins (CPs) belong to the nuclear export factor BR1 family in the Gemini-coat protein superfamily. Moreover, the phylogenetic analysis performed shows a very strong affinity amongst the African isolates within their geographical regions without evidence of evolutionary divergence amongst all the isolates. Multiple sequence alignment of the genes revealed a highly conserved domain and three motifs. Thirteen of the isolates from Africa share similar physicochemical properties and possess DNA-binding property. A three-dimensional homology model structure was built for ACMV CPs with Ramachandran plot values between 99 and 100%. The gene annotation analysis predicted most of the coat proteins associated with the virion and virus capsid, undertaking mainly organic compound and nucleic acids binding molecular functions and shuttling as the dominant biological process. Therefore, this study established that ACMV isolates have common ancestral descent. These findings form a strong basis that could be harnessed by applying molecular techniques for effective detection and management of ACMV isolates, causing substantial cassava losses recorded annually across several continents of the globe.
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One of the major constraints to production of okra (Abelmoschus esculentus L.) in Nigeria and in particular in Kaduna and Zamfara States, is the problem of okra mosaic virus and okra leaf curl virus. This study was carried out to provide... more
One of the major constraints to production of okra (Abelmoschus esculentus L.) in Nigeria and in particular in Kaduna and Zamfara States, is the problem of okra mosaic virus and okra leaf curl virus. This study was carried out to provide information on the occurrence and distribution of okra mosaic and okra leaf curl viruses on okra, in Kaduna and Zamfara states, Nigeria. A survey of okra-producing farms was carried out during dry and wet seasons of 2017 cropping season in Kaduna (Zaria, Lere, and Igabi Local Government Areas) and Zamfara (Gusau, Bungudu, and Zurmi LGAs) states. Leaf samples (15) of symptomatic okra plants were collected from each farm in the study area. The total number of plants and the number of symptomatic plants within each subplot were recorded, and the disease incidence was determined. Double Antibody Sandwich Enzyme-Linked Immunosorbent Assay (DAS- ELISA) kit was used in the detection of Okra Mosaic Virus while Polymerase Chain Reaction (PCR) was employed fo...
Intensive surveys conducted at Samaru and its environs in the northern Guinea Savanna of Nigeria between October 2000 and September 2002, indicated that Bemisia tabaci (Genn.) infests forty two (thirty three cultivated and seven wild)... more
Intensive surveys conducted at Samaru and its environs in the northern Guinea Savanna of Nigeria between October 2000 and September 2002, indicated that Bemisia tabaci (Genn.) infests forty two (thirty three cultivated and seven wild) species of plants. Twenty nine of the plants were found in upland, two in the lowland and eleven in both upland and lowland (fadama) areas. Heavily infested plants were distorted, chlorotic and stunted. Symptoms of virus infection were associated with some of the infested plants. This is the first comprehensive report of hosts of B. tabaci in Nigeria.
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A field survey was conducted during the 2018 rainy season (June – October) in three major ginger producing Local Government Areas (LGAs) of Kaduna State, Nigeria to determine the occurrence and spread of wheat streak mosaic virus (WSMV)... more
A field survey was conducted during the 2018 rainy season (June – October) in three major ginger producing Local Government Areas (LGAs) of Kaduna State, Nigeria to determine the occurrence and spread of wheat streak mosaic virus (WSMV) infecting ginger. Symptomatic and asymptomatic ginger leaf samples (n=180) and weed samples (n=45) were collected from the surveyed fields and indexed against WSMV using Double Antibody Sandwich Enzyme-linked Immunosorbent Assay (DAS-ELISA). The results obtained showed that WSMV occurred in all the LGAs surveyed but with significant ( P = 0.05 ) variation in distribution. Jaba had the highest virus incidence (22.67\,\%) followed by Kagarko (17.67\,\%) while Kachia had the lowest virus incidence of 10.00\,\%. To the best of our knowledge, this is the first report of WSMV infecting ginger in Nigeria. Rottboellia cochinchinensis (Lour.) Clayton and Setaria barbata (Lam.) Kunth tested positive against WSMV as alternative weed hosts of the virus. The inci...
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Tomato ( Solanum lycopersicum L.), is an important crop, extensively cultivated as vegetable and fruit worldwide for its nutritional supply of vitamins, minerals, antioxidants and carbohydrates to humans. Its production in Nigeria is... more
Tomato ( Solanum lycopersicum L.), is an important crop, extensively cultivated as vegetable and fruit worldwide for its nutritional supply of vitamins, minerals, antioxidants and carbohydrates to humans. Its production in Nigeria is dominated by poor resource peasant farmers as their major means of livelihood. Virus diseases have been considered as an economically important biotic factor mitigating profitable tomato production both during the wet and dry seasons in Nigeria. The increase in the number of virus diseases causing significant yield losses on tomato is of great concern and these vary from one location to another. We discuss the status of research on viruses infecting cultivated tomato in Nigeria.
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There are several different methods of classifying insect. The technique of using wing landmarks and morphometric features to discriminate insect population into species and specify the variations in the varieties within the intra... more
There are several different methods of classifying insect. The technique of using wing landmarks and morphometric features to discriminate insect population into species and specify the variations in the varieties within the intra specific group was used to classify Apis mellifera kept in beekeeping practice in the forest vegetation zone of Nigeria into morphoclusters. The multivariate morphometric data obtained was analysed with parametric statistic tools of mean, standard deviation and standard error. The distribution and relation between them were subjected to two step cluster analysis. Morphoclusters means were presented in centroids and also the simultaneous confidence intervals (95%) of means values of wing morphometric and landmarks were expressed. Varieties of Apis mellifera found in this study formed four distinct morphoclusters based on wing landmarks and morphometric. Osun State recorded morphoclusters 1 and 2 while Ebonyi and Oyo States had morphoclusters 3 and 4 respect...
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The major insect pests on rice in Tanzania are listed and described. They are from five orders (Coleoptera, Diptera, Hemiptera, Lepidoptera and Orthoptera) and are discussed as stem borers, stem and root feeders, and leaf and panicle... more
The major insect pests on rice in Tanzania are listed and described. They are from five orders (Coleoptera, Diptera, Hemiptera, Lepidoptera and Orthoptera) and are discussed as stem borers, stem and root feeders, and leaf and panicle feeders. This review puts together the hitherto fragmented information available on the distribution, host range, biology/life-cycle and ecology, and the management measures of the insect pests of rice. Areas for future research are also mentioned.
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Abstract Field surveys were conducted during the 2012 wet season in five Local Government Areas (LGAs) each of Kaduna and Kano States, Nigeria, to determine the incidence of potyviruses infecting sorghum. Sorghum leaves (n = 450) showing... more
Abstract Field surveys were conducted during the 2012 wet season in five Local Government Areas (LGAs) each of Kaduna and Kano States, Nigeria, to determine the incidence of potyviruses infecting sorghum. Sorghum leaves (n = 450) showing mosaic, streak, dwarfism and asymptomatic ones were collected from 30 fields. Based on the fields, the virus disease incidence in Kaduna State was 19.3, 17.1, 53.7, 35.4 and 32.7% for Sabon Gari, Giwa, Lere, Kubau and Makarfi LGAs, respectively. In Kano State, the incidence was 13.3, 32.9, 28.9, 34.3 and 50.9% for Tsanyawa, Minjibir, Wudil, Sumaila and Garun Malam LGAs, respectively. Enzyme-linked immunosorbent assay (ELISA) was employed in the detection of the viruses. There was overall incidence of Sorghum mosaic virus 2.8%, Maize dwarf mosaic virus 2.0%, Sugarcane mosaic virus 3.3% and unidentified potyvirus 4.2% from the two states.
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Acta virologica 48: 69 – 71, 200
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... by: [66.249.67.103] On: 11 July 2011, At: 16:06 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number ... 779 p. Heinrichs, EA; Sy, AA; Akator, SK; Oyediran, I. 1997: Seasonal occurrence of rice... more
... by: [66.249.67.103] On: 11 July 2011, At: 16:06 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number ... 779 p. Heinrichs, EA; Sy, AA; Akator, SK; Oyediran, I. 1997: Seasonal occurrence of rice yellow mottle virus in lowland rice in Cote d ...
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... To verify the presence or absence of RYMV, plants were evaluated by enzyme-linked immunosorbent assay (ELISA). ... and C. pulla collected live from fresh growth of Supa ratoon rice which was infected with RYMV, were immediately placed... more
... To verify the presence or absence of RYMV, plants were evaluated by enzyme-linked immunosorbent assay (ELISA). ... and C. pulla collected live from fresh growth of Supa ratoon rice which was infected with RYMV, were immediately placed on the rice seedlings. ...
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Research Interests: Geography, Demography, Phylogeography, Africa, Biology, and 15 morePopulation Dynamics, Medicine, Molecular Ecology, Biological Sciences, Phylogeny, Cluster Analysis, Oryza Sativa, High Resolution, Genetic variation, Large Scale, Base Sequence, Likelihood Functions, Environment, Rice Yellow Mottle Virus, and Molecular Sequence Data
... REFERENCES Abo, ME 1998. Studies on the mode of transmission of RYMV. ... Agricultural Research Report. Centre for Agricultural Publishing and Doc-umentation, Wageningen, 152 pp. Banwo, OO, Makundi, RH, Abdallah, RS and Mbapila, JC... more
... REFERENCES Abo, ME 1998. Studies on the mode of transmission of RYMV. ... Agricultural Research Report. Centre for Agricultural Publishing and Doc-umentation, Wageningen, 152 pp. Banwo, OO, Makundi, RH, Abdallah, RS and Mbapila, JC 2001a. ...
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We report the complete nucleotide sequence of DNA-A of a begomovirus naturally infecting Jatropha curcas L. in Nigeria. Symptoms observed on infected plants were severe mosaic, mottling and blistering of leaves. The virus, which we... more
We report the complete nucleotide sequence of DNA-A of a begomovirus naturally infecting Jatropha curcas L. in Nigeria. Symptoms observed on infected plants were severe mosaic, mottling and blistering of leaves. The virus, which we provisionally name "jatropha mosaic Nigeria virus" (JMNV), has a monopartite genome of 2,779 to 2,789 nucleotides. Pairwise comparisons of DNA-A sequences showed that JMNV had maximum nucleotide sequence identity (72%) with a strain of tomato yellow leaf curl virus. Since there are widespread infections of jatropha in Nigeria showing similar symptoms as those investigated in the present study, JMNV may represent a significant threat to a promising bioenergy crop.
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Abstract Pests damage crops at different stages of growth on the field, at harvest, during transportation and in storage. This leads to 540% crop loss yearly and has a serious effect on the food security for the ever-increasing... more
Abstract Pests damage crops at different stages of growth on the field, at harvest, during transportation and in storage. This leads to 540% crop loss yearly and has a serious effect on the food security for the ever-increasing population of the country. The management of ...
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Field experiments were conducted in Samara for a two year period (1996 and 1997) to identify the major pod sucking bugs of soybean and to determine the effect of insecticides and frequency of application on the bugs and soybean yield.... more
Field experiments were conducted in Samara for a two year period (1996 and 1997) to identify the major pod sucking bugs of soybean and to determine the effect of insecticides and frequency of application on the bugs and soybean yield. Nezara viridula L. Halydicoris ventralis Dall. Sphaerocoris annulus Fab. and Agonoscelis versicolor Fab. were the major bugs and their population
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Arch. Phytopath. Pflanz., 2001, Vol. 33, pp. 395-403 © 2001 OPA (Overseas Publishers Association) NV Reprints available directly from the publisher ... Photocopying permitted by license only the Hanvood Academic Publishers imprint, part... more
Arch. Phytopath. Pflanz., 2001, Vol. 33, pp. 395-403 © 2001 OPA (Overseas Publishers Association) NV Reprints available directly from the publisher ... Photocopying permitted by license only the Hanvood Academic Publishers imprint, part of The Gordon and Breach ...
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... CRC Press, Boca Raton, Florida, USA. ... Inter-national Rice Research Notes 20, 1. Luzi-Kihupi, A., Mgoo, SO, Bernado, VR, Mabagala, RB, Mlozi, MRS, Nchimbi-Msolla, S. and Mushobozi, DMK (2000): First University wide Conference,... more
... CRC Press, Boca Raton, Florida, USA. ... Inter-national Rice Research Notes 20, 1. Luzi-Kihupi, A., Mgoo, SO, Bernado, VR, Mabagala, RB, Mlozi, MRS, Nchimbi-Msolla, S. and Mushobozi, DMK (2000): First University wide Conference, Sokoine University of Agriculture, Morogoro ...
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... Suakoko (Liberia); Gao, Kogoni, Mopti and Sikasso (Mali); Kaed and Mpouri (Mauritania); Daikena,Kolo, Libore, Sadia ... Abubakar Z, Ali F, Pinel A, Traore O, N'Guessan PN, Nottengem JL, Kimmins F ... Banwo OO, Winter... more
... Suakoko (Liberia); Gao, Kogoni, Mopti and Sikasso (Mali); Kaed and Mpouri (Mauritania); Daikena,Kolo, Libore, Sadia ... Abubakar Z, Ali F, Pinel A, Traore O, N'Guessan PN, Nottengem JL, Kimmins F ... Banwo OO, Winter S, Koerbler M, Abdullahi I, Abdallah RS, Makundi RH. 2002. ...