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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The chlorotic and green types are caused by two variants of the satellite RNA while the mosaic type is caused by infection with a mixture of both variants. This plant was infected early and will not produce any yield. Knowledge Bank home Change grounenut. Mechanisms of resistance operating against individual causal agents of the disease complex and the vector need to be understood. Several of these varieties had excellent performance in farmer diseaxe on-farm verification in Malawi, Zambia, Mozambique, and Uganda.
Groundnut plants affected take on a bushy appearance due to stunting and distortion of the growing shoots. A package of options has been developed and is being verified on-farm in three agroecologies in Malawi.
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Journal of General Virology. Plants that are infected early will produce no yield. From Wikipedia, the free encyclopedia. InICRISAT-Lilongwe launched a program on screening of global germplasm for resistance against rosette in order to diversify the genetic base of rosette resistance.
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Groundnut Rosette Disease | Plantwise
In a study in Tanzania, the first affected plants were seen six days after the first aphids were observed. Recently, several high-yielding short-duration days Spanish types with resistance to rosette have been developed and are in on-farm evaluation in southern and eastern Africa. 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.
Breeding for multiple resistance rosette virus complex and the vector should receive high priority.
Groundnut Rosette Disease
Groundnut Rosette Disease Recognize the problem There are two types of symptom seen in the crops: Views Read Edit View history. ICRISAT scientists developed a simple and effective field screening technique to evaluate germplasm and breeding lines for resistance to rosette. However, most of the rosette-resistant varieties rosftte to date are late maturing and are not suitable to some production systems in Africa where the rainy season is short.
Retrieved 13 February High degree of resistance to rosette or its vector was recently identified in roseyte Arachis species. Groundnut rosette virus was first described in Africa in and causes serious damage to groundnut crops on that continent. There is a yellowing or mottling of the foliage.
Timely planting as soon as there is enough water in the soil. More recently it has been cultivated in other parts of the world and is an important subsistence crop in Sub-Saharan Africa. Umbraviruses Viral plant pathogens and diseases Peanut diseases. This page was last edited on 22 Marchat 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.
On-farm verification and demonstration of agronomically and commercially acceptable high-yielding, rosette-resistant medium- to short-duration groundnut varieties and the package of options for integrated management of groundnut rosette needs to be intensified in the region. Annals of Applied Biology. This is to ensure that we give you the best experience possible. Created in Uganda August This will also be useful in establishing the allelic relationships.
Identification of rosette resistance in Spanish types has great significance to the development of high-yielding short-duration rosette-resistant varieties. 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. Rosette is the most destructive disease of groundnut in Africa. The recommendations in this factsheet are relevant to: A breeding programme has been established in Malawi focussing on disease resistance, early maturity and high yield.
Retrieved from ” https: The groundnut Arachis hypogaea originated in South America where it has long been domesticated. For example, the rosette epidemic in in central Malawi and eastern Zambia destroyed the crop to such an extent that the total area of groundnut grown in Malawi fell from 92, ha in to 65, ha in Articles with ‘species’ microformats All articles with dead external links Articles with dead external links from March Articles with permanently dead external links.
Resistance to rosette was identified for the first time in Asian and South American land races.
Sources of resistance to rosette were first discovered in Senegal in Close Find out more. Components of integrated management of rosette using high-yielding rosette-resistant varieties ICGV-SM and ICG and cultural practices such as early sowing at optimum plant densities have been investigated. If you would like to, you can learn more about the cookies we use. The disease is endemic to sub-Saharan Africa and its off-shore islands, including Madagascar.
Groundnut rosette virus EoL: Groundnut rosette virus Virus classification Group: