Groundnut rosette disease (GRD), caused by a complex of three agents: groundnut rosette assistor luteovirus, groundnut rosette umbravirus. It depends on groundnut rosette assistor virus (GRAV; Luteoviridae) for encapsidation in GRAV coat protein and for transmission by Aphis craccivora in the. SUMMARY: Groundnut rosette disease is the most important disease of groundnuts of sub-. Saharan Africa. Epidemics occur without warning. It is caused by a.
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Sources of resistance to rosette were first discovered in Senegal in To date, about 12, germplasm lines have been screened and in excess long-duration virginia types and 20 short-duration Spanish types with resistance to rosette have been identified.
Groundnut rosette virus was first described in Africa in and causes serious damage to groundnut crops on that continent. In spite of several achievements made in the past, development of short-duration groundnut varieties with resistance to rosette remained as a challenge to ICRISAT for a long time. However, smallholder farmers in Africa for a number of reasons, seldom adopted these practices.
Groundnut plants affected take on a bushy appearance due to stunting and distortion of the growing shoots. Breeding for multiple resistance rosette virus complex and the vector should receive high priority.
Groundnut Rosette Disease
Mechanisms of resistance operating against individual causal agents of the disease complex and the vector need to be understood. Views Read Edit View history. A package of options has been developed and is being verified on-farm in three agroecologies in Malawi. Several of these varieties eisease excellent performance in farmer participatory on-farm verification in Malawi, Zambia, Mozambique, and Uganda. Knowledge Bank home Change location.
Groundnut Rosette Disease Recognize the problem There are two types of symptom seen in the crops: Groundnut rosette virus EoL: Send feedback on this factsheet. There is a yellowing or mottling of the foliage. Close Find out more. It is spread by aphids feeding on the crop. Two main forms of the disease, chlorotic rosette and green rosette have yroundnut described based on symptoms. It is transmitted between plants by insect vectors such as the groundnut aphid Aphis craccivora.
Sensitive and specific methods to detect the three components of rosette disease have been rosete. The chlorotic and green types are caused by two variants disexse the satellite RNA while the mosaic type is caused by infection with a mixture of both variants.
Rosette is the most destructive disease of groundnut in Africa. Annals of Applied Biology.
MANAGEMENT OF GROUNDNUT ROSETTE: PAST, PRESENT, AND FUTURE
Plants that are infected early will produce no yield. Utilization of wider gene pools should result in identification diseasf certain cross combinations with high recovery of disease resistance and more useful recombinants.
These sources formed the basis for rosette resistance breeding programs throughout Africa and have contributed to the development of several high-yielding, rosette-resistant groundnut varieties e.
Spray whole plant with insecticides, such as dimethoate, 14 days after emergence usually 5mls per 2 litres of water but read the label for instructions and then at day intervals for a total of four sprays. Cultural practices such as early sowing at optimal plant densities are known to reduce the disease incidence. Resistance to rosette was identified for the first time in Asian and South American land races. This page groubdnut last edited on 22 Marchgorundnut In other projects Wikispecies.
Retrieved 13 February For erect types Serenut-4T plant one and a half feet between rows and half a foot between plants along the row. Retrieved from ” https: Articles with ‘species’ microformats All articles with dead external links Articles with dead external links from March Articles with permanently dead external links.
Therefore host-plant resistance to the disease and its vector is regarded as the most viable and sustainable solution.
Components of integrated management of rosette using high-yielding rosette-resistant varieties ICGV-SM and ICG and cultural practices such disaese early sowing at optimum plant densities have been investigated. Plantwise Factsheets for Farmers. The sources of resistance identified in global germplasm need to be characterized based on DNA profile disrase using molecular markers.
Virus resistant varieties of groundnut have been discovered but mostly have a long growing period five to six months rather than three to four for other varieties and may therefore be more susceptible to drought. Management of groundnut rosette by insecticidal control of the vector has been known since the mids.
In a study in Tanzania, the first affected plants were seen six days after the first aphids were observed.