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Scientists closer to developing cassava with resistance to two deadly viral diseases
this is a good article about work on cassava varieties for disease-resistant. Deals with those cassava grounds three disease and cassava mosaic does he.
allAfrica.com: Tanzania: Farmers Use Mobile Phones to Track Deadly Cassava Diseases (Page 1 of 1)
this looks like a really cool project....
Stategies for controlling CMD
...potential useful
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assava mosaic disease (CMD) is caused by whiteflyborne viruses of the genus Begomovirus (family Geminiviridae). The disease has long been regarded as the most important of those affecting cassava in sub-Saharan Africa, and has been the subject of much research, especially since the onset of the current very damaging pandemic in eastern and central Africa. This review considers the main features of CMD and the various possible means of control. The main emphasis to date has been on the development and deployment of virus-resistant varieties. These are widely adopted in countries where CMD has caused serious problems, and provided a powerful incentive for farmers to abandon some of the most susceptible of their traditional varieties. Only limited use has been made of phytosanitation involving CMD-free planting material and the removal (roguing) of diseased plants. Cultural methods of control using varietal mixtures, intercrops or other cropping practices have also been neglected, and there is a need for much additional research before they can be deployed effectively. Nevertheless, the severe losses now being caused by CMD in many parts of sub-Saharan Africa could be greatly decreased through the application of existing knowledge.
Wiley InterScience :: JOURNALS :: Journal of Integrative Plant Biology
Results of screening work to incorporate insect and disease resistance into cassava.
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Twelve cassava landraces were evaluated for sources of resistance genes to diseases and pests of major economic importance in Africa. The objective was to assess their levels of field resistance to mosaic disease (ACMD), bacterial blight (CBB), anthracnose (CAD), and green mite (CGM), compared to TMS30572, an elite cultivar widely adopted in Africa. Considerable genotypic variation was observed among cultivars for resistance to ACMD and CGM but not for CBB and CAD. The lowest mean incidence of 12% and severity of 1.8 on a scale of 1–5 for ACMD was recorded for Atu, a landrace with farmer acceptable qualities. In comparison, the improved cultivar, TMS 30572, had a mean disease incidence of 72% and a severity score of 2.8. Another landrace, MS-20 had the lowest CGM damage score (2.1) while TMS 30572 emerged as one of the susceptible cultivars with a damage score of 3. Additional sources of resistance to ACMD and CGM that may possibly be better than the popular improved cultivar, TMS 30572, were identified in this study. These could serve as novel sources of additional genes to complement existing resources for elite cassava breeding in Africa.
Disease devastates cassava crop, threatens hunger_stockbreeding_Agriculture Market New
CMD in Congo
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Brazzaville (The Republic of Congo) - Cassava is the staple food for most people in the Republic of Congo, but this main source of nourishment is being threatened by a disease that has spread to most areas of the country.
"We've been having problems for more than two years and it's getting worse with the mosaic destroying our crops," said Rose Ambeto, who has several cassava fields. The virus, known as cassava mosaic disease (CMD), attacks the leaves of the plant and limits the growth of its roots. It is spread by insects or by diseased cassava being transplanted to new areas.
Association of East African cassava mosaic virus-Uganda
Report on spreading cassava mosaic disease
Uganda: Disease-Resistant Cassava Cloned at Namulonge (Page 1 of 1)
Interesting comments on the spread of diseases of cassava.
Farm Radio Weekly » Farm Radio Weekly Archive » Burundi: Farmers revive cassava with help of disease-free cuttings (UN Food and Agriculture Organiz
More news about virus-free cassava cuttings, this one from Burundi
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Just five years ago, Mr. Nduwiman was not so pleased with his crops. At that time, an aggressive strain of Cassava Mosaic Disease began a devastating march through the country. The leaves of his cassava plants displayed the telltale spots of Cassava Mosaic Disease, which stunts the growth of cassava tubers beneath the soil. Farms in the Democratic Republic of the Congo, Rwanda, and Uganda, were also affected.
CBSD in Tanzania
Lots of interesting stuff in this news report on cassava brown streak disease:
* threatens a region with 1.6 million people
* authorities recommend sowing alternative food crops
* cassava seed transport ban declared
* CBSD causes US$ 50 million in
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Cassava brown streak disease (CBSD) is spreading at an alarming rate in almost all districts of Mara Region, thus threatening the major food crop that is widely grown in the lake zone, researchers from
Ukiruguru Institute [for agricultural research for the Lake and Western Zone] have warned. They have now recommended alternative food crops to be grown without delay, warning that there will be no cassava plants in the area a year from now.
Ugandans critical of ruling party, poll finds |
See the final paragraph on cassava in Uganda and how it is coming back, doing well, despite the disease problems of the past
CMD in Congo
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Cassava is the staple food for most people in the Republic of Congo, but this main source of nourishment is being Threatened by a disease that has spread to most areas of the country. "We've been having problems for more than 2 years and the mosaic is destroying our crops," said Rose Ambeto, who has several cassava fields. "Our
harvests are getting worse and worse," she said. Veronique Okaka, who
grows cassava in Sangha department [northern Congo], also complained
of hard times due to the cassava mosaic. The price of cassava has
more than doubled in recent months.
ReliefWeb » Document » Cassava's comeback: On the plate of over 1, 5 million people in Africa
This news article conflicts with the previous one to some extent ......I don't believe that cassava is difficult to steal. I have run across many reports of cassava theft.
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After years of massive crop losses caused by a devastating virus, farmers are harvesting healthy cassava - one of Africa's principal foodstuffs - throughout the Great Lakes region, FAO announced today, hailing the achievement as a milestone in its ever stronger partnership with the European Union.
Cassava Mosaic Disease in Congo
This news report seems particularly alarming....
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Cassava is the staple food for most people in the Republic of Congo, but this main source of nourishment is being threatened by a disease that has spread to most areas of the country.
"We've been having problems for more than two years and it's getting worse with the mosaic destroying our crops," said Rose Ambeto, who has several cassava fields.
The virus, known as cassava mosaic disease (CMD), attacks the leaves of the plant and limits the growth of its roots. It is spread by insects or by diseased cassava being transplanted to new areas.
Figure 3 : Global trends in emerging infectious diseases : Nature
Interesting maps of global infectious diseases....must read.
MoU to develop virus resistant cassava- Agriculture-Economy-News-The Economic Times
news about an effort to devolop technologies against cassava disease
Angola suffers from mosica disease effects on Cassava
Amazing how important cassava mosaic virus is in Angola, in the context of food security.
allAfrica.com: Africa: Alliance for a Green Revolution in Africa (AGRA)
Overview of Cassava breeding in Africa....
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A meeting of Africa's leading cassava breeders zeroed in on actions needed to stop the rapid spread of cassava brown streak disease (CBSD). The resurgent crop disease has already caused a low-grade famine in northern Mozambique, and led farmers in Zanzibar to largely abandon cultivation of the critical food crop. Breeders from Uganda, Kenya, Tanzania, Malawi and Mozambique all noted the rising threat of the disease to small-scale farmers in their areas.
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These PROMED reports are every now and then have something interesting on crop diseases. Most of PROMED is human diseases. Lots of Avian flu, West Nile virus and the like. There is a good deal of animal diseases as well. Usually once a week there is a cro
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