Home
Glenn Zinho's Library tagged → View Popular
New viral disease threatens region’s cassava farming
This article is about cassava brown streak disease (CBSD). One interest point is the claim that CBSD is often found in varieties that are resistant to cassava mosaic disease (CMD).
http://www.promedmail.org/pls/otn/f?p=2400:1001:50943::NO::F2400_P1001_BACK_PAGE,F2400_P1001_PUB_MAIL_ID:1006,77162
According to this report, CMD is back in West Africa and threatens to do serious damage
Cassava disease may cause food shortage in Africa - Articles of Victor Emeruwa
This is a report of CMD in West Africa. Not a lot of information. Is this the strain that hit the Great Lakes Area in the 1990's?
New bug wiping out our cassava plants
Article on CBSD in Uganda. Discusses challenges, especially given that cassava is seen as a growth sector, especially biofuels. Includes something on the impact of CMD in Uganda the previous decade.
-
In the early 1990s, the cassava mosaic virus attacked 80 per cent of the country. Before the epidemic, Uganda had produced 3.5 million metric tonnes of cassava annually, but it dropped to just 0.5 metric tonnes, costing the economy $60 million a year.
Stategies for controlling CMD
...potential useful
-
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.
-
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
-
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
-
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 damag
-
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
-
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.
-
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....
-
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.
Selected Tags
Related Tags
Sponsored Links
Top Contributors
Groups interested in disease
-
Microbes and Diseases
This list is assembled for ...
Items: 22 | Visits: 50
Created by: Charlie Sensenbrenner
-
Cardiovascular Disease
Items: 409 | Visits: 372
Created by: Matti Narkia
-
Diseases
Items: 24 | Visits: 41
Created by: Laura Bart
Highlighter, Sticky notes, Tagging, Groups and Network: integrated suite dramatically boosting research productivity. Learn more »
Join Diigo