Whitefly Transmitted Plant Viruses in Nigeria

Alegbejo, M. D.

doi:10.1300/j064v17n02_10

Cited by 25 publications

(16 citation statements)

References 9 publications

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“…Also in pepper, there are variations in the susceptibility to begomovirus infections. In Nigeria, moderate resistance in four pepper cultivars has been identified [79]. In addition to the conventional breeding, different transgenic approaches for achieving resistance or tolerance have been tested against begomoviruses infecting tomato and pepper [80][81][82] and this may be a way forward for obtaining durable resistance.…”

Section: Resistancementioning

confidence: 99%

“…As part of an IPM approach, other agricultural practices for management of ToLCD/TYLCD and other diseases caused by begomoviruses include eradication of source plants, cultivation of bait plants, reflective mulches and inclusion of physical barriers, and use of virus-free transplants [89][90][91][92]. In Nigeria, early planting of pepper or tomato has been found to reduce disease incidence [79]. Practices suggested for vegetable production in tropical Africa have also been intercropping to divert whiteflies or changed sowing times to avoid periods of peaks with pest populations [93].…”

Section: Agricultural Practicesmentioning

confidence: 99%

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Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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Vegetables play a major role in the livelihoods of the rural poor in Africa. Among major constraints to vegetable production worldwide are diseases caused by a group of viruses belonging to the genus Begomovirus, family Geminiviridae. Begomoviruses are plant-infecting viruses, which are transmitted by the whitefly vector Bemisia tabaci and have been known to cause extreme yield reduction in a number of economically important vegetables around the world. Several begomoviruses have been detected infecting vegetable crops in West and Central Africa (WCA). Small single stranded circular molecules, alphasatellites and betasatellites, which are about half the size of their helper begomovirus genome, have also been detected in plants infected by begomoviruses. In WCA, B. tabaci has been associated with suspected begomovirus infections in many vegetable crops and weed species. Sequencing of viral genomes from crops such as okra resulted in the identification of two previously known begomovirus species (Cotton leaf curl Gezira virus and Okra yellow crinkle virus) as well as a new recombinant begomovirus species (Okra leaf curl Cameroon virus), a betasatellite (Cotton leaf curl Gezira betasatellite) and new alphasatellites. Tomato and pepper plants with leaf curling were shown to contain isolates of new begomoviruses, collectively referred to as West African tomato-infecting begomoviruses (WATIBs), new alphasatellites and betasatellites. To study the potential of weeds serving as begomovirus reservoirs, begomoviruses and satellites in the weed Ageratum conyzoides were characterized. Sequence analyses showed that they were infected by isolates of a new begomovirus (Ageratum leaf curl Cameroon virus) that belong to the WATIBs group, a new betasatellite (Ageratum leaf curl Cameroon betasatellite), an alphasatellite and two types of defective recombinants between a begomovirus and an alphasatellite. Putative recombinations were detected in begomovirus genomes for all four plant species studied, indicating that recombination is an important mechanism for their evolution. A close relationship between the begomoviruses infecting pepper and tomato and A. conyzoides and the detection of the same alphasatellite in them support the idea that weeds are important reservoirs for begomoviruses and their satellites. With this high diversity, recombination potential and transmission by B. tabaci, begomoviruses and ssDNA satellites pose a serious threat to crop production in West and Central Africa.

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Section: Resistancementioning

confidence: 99%

Section: Agricultural Practicesmentioning

confidence: 99%

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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“…The infected fruits are covered with yellow or creamy color, fibrous, small and tough [3]. Alegbejo [4] stated that whiteflies could transmit probably 21 viruses in Nigeria. Most of these viruses belong to Gemini virus.…”

Section: Introductionmentioning

confidence: 99%

Management of Okra Yellow Vein Mosaic Virus and its Vector through Plant Extracts

Chaudhary¹,

Ma²,

Yousaf³

2017

J Plant Pathol Microbiol

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“…Within the UK, B. tabaci poses a threat primarily to protected vegetable crops due to the large number of virus diseases it is known to transmit (Alegbejo, 2000;Jones, 2003). The pest can also cause damage by direct feeding on plant sap and indirect damage through contamination of leaves by honeydew excretion (Naranjo et al, 2002;Nomikou et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Leaf dipping as an environmental screening measure to test chemical efficacy against Bemisia tabaci on poinsettia plants

Cuthbertson

Blackburn

Northing

et al. 2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:The screening of potential chemicals for control of Bemisia tabaci on poinsettia (Euphorbia pulcherrima c.v. Lilo Pink) plants using a leaf dipping technique was investigated. All relevant B. tabaci lifestages (eggs, larvae and adults) were investigated. In leaf dipping tests, Certis spraying oil was the only compound to show potential to be used as a control agent against B. tabaci eggs, with 81% obtained mortality. Oberon resulted in no mortality of B. tabaci eggs in the reported experiments. Leaf dipping against second instar and adult B. tabaci proved more effective for all chemical products. Dipping techniques using Majestik, Certis spraying oil and Agri-50 E all resulted in high second instar larval mortality (93, 87 and 85.5 %, respectively). Certis spraying oil again resulted in a high efficacy against adult B. tabaci with 100 % mortality obtained. The potential of the various chemicals to be incorporated into integrated pest management strategies for the control of B. tabaci is discussed.

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Whitefly Transmitted Plant Viruses in Nigeria

Cited by 25 publications

References 9 publications

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

Management of Okra Yellow Vein Mosaic Virus and its Vector through Plant Extracts

Leaf dipping as an environmental screening measure to test chemical efficacy against Bemisia tabaci on poinsettia plants

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