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.
|Country:||Sao Tome and Principe|
|Published (Last):||21 April 2015|
|PDF File Size:||11.51 Mb|
|ePub File Size:||13.63 Mb|
|Price:||Free* [*Free Regsitration Required]|
The recommendations in this factsheet are relevant to: However, smallholder farmers in Africa for a number of reasons, seldom adopted these practices. Mechanisms of resistance operating against individual causal agents of the disease complex froundnut the vector need to be understood.
ICRISAT scientists developed a simple and rosettee field screening technique to evaluate germplasm and breeding lines for resistance to rosette. This page was last edited on 22 Marchat Several of these varieties had excellent performance in farmer participatory on-farm verification in Malawi, Zambia, Mozambique, and Uganda. From Wikipedia, the free encyclopedia. Rosette disease has been and continues to be responsible for devastating losses to groundnut production in Africa.
It is transmitted between plants by insect vectors such as the groundnut aphid Aphis craccivora. 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.
Groundnut rosette virus disease is a very serious grouhdnut of groundnuts in Uganda. For spreading types Serenut 2 plant three plants per two feet along the row. The disease is epidemic in nature and there is a seasonal cycle of infection, but the origins of this virus are unknown. 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.
The disease is caused by a complex of three agents: It is spread by aphids feeding on the crop. Close Find out more. The groundnut aphid, Aphis craccivorais the principal vector of the disease.
Groundnut Rosette Disease
However, most of the rosette-resistant varieties released to date are late maturing and are not suitable to some production systems in Africa where the rainy season is short. The groundnut Arachis hypogaea originated in South America where it has long been domesticated.
Continuing to use www.
Knowledge Bank home Change location. Sensitive and specific methods to detect the three components of rosette disease have been developed. Breeding for multiple resistance rosette virus complex and the vector should receive high priority.
PDF Add to factsheet booklet. If you would like to, you can learn more about the cookies we use. A breeding programme has been established in Malawi focussing on disease resistance, early maturity and high yield.
Research has shown that plants infected by groundnut rosette virus alone show little or no effect, but that the symptoms of the disease are caused by a satellite RNA co-infectiona subviral agent.
Plants affected when young may produce no nuts. 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. Resistant varieties exist such as Serenuts series and Igola 1. Sources of resistance to rosette were first discovered in Senegal in This is to ensure that we give you the best experience possible.
Management of groundnut rosette by insecticidal control of the vector has been known since the mids.
Annals of Applied Biology. 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. When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.
The chlorotic and green types are caused by two variants of the satellite RNA while the mosaic type is caused by infection with roseyte mixture of both variants.
Rosette is the most destructive disease of groundnut in Africa. This will also be useful in establishing the allelic relationships.
There is no control for the virus once a plant is infected but control of the aphids will prevent further spread. A package of options has been developed and is being verified on-farm in three agroecologies in Malawi.
In other projects Wikispecies.
MANAGEMENT OF GROUNDNUT ROSETTE: PAST, PRESENT, AND FUTURE
InICRISAT-Lilongwe launched a program on screening of global germplasm for resistance against rosette in order to diversify the genetic base of rosette resistance.
The main vector for groundnut rosette virus is the groundnut aphid Aphis craccivora. More recently it has been cultivated in other parts of the world and is an important subsistence crop in Sub-Saharan Africa.
Groundnut rosette virus was first described in Africa in and causes serious damage to groundnut crops on that disfase. Groundnut rosette virus Virus classification Group: Inheritance of rosette resistance in groundnut was confirmed. 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 grpundnut be intensified in the region.
Send feedback on this factsheet.