Studies on Variability of Cassava Brown Streak Disease Symptoms and the Relationship between Virus Infection and Symptom Expression on Cassava Crop

2021 ◽  
pp. 79-95
Author(s):  
Gration M. Rwegasira
Keyword(s):  
Virus Infection ◽  
Symptom Expression ◽  
Disease Symptoms ◽  
Cassava Brown Streak Disease ◽  
Cassava Crop ◽  
The Relationship ◽  
Brown Streak

scholarly journals Field evaluation of selected cassava genotypes for cassava brown streak disease based on symptom expression and virus load

2014 ◽  
Vol 11 (1) ◽  
Author(s):  
Tadeo Kaweesi ◽  
Robert Kawuki ◽  
Vincent Kyaligonza ◽  
Yona Baguma ◽  
Geoffrey Tusiime ◽  
...  
Keyword(s):  
Field Evaluation ◽  
Symptom Expression ◽  
Virus Load ◽  
Cassava Brown Streak Disease ◽  
Brown Streak

scholarly journals Insight into Re-emergence of Cassava Brown Streak Disease: the Need to explore Diverse Approaches for Effective Control

2019 ◽  
Vol 11 (1) ◽  
pp. 26-29 ◽  
Author(s):  
John O. OLADOKUN
Keyword(s):  
Management Strategies ◽  
Central Africa ◽  
Yield Potential ◽  
Effective Control ◽  
International Attention ◽  
Research Findings ◽  
Cassava Brown Streak Disease ◽  
Cassava Crop ◽  
Insight Into ◽  
Brown Streak

The consumption of cassava crop per capita calories in many Africa countries ranked it as the second most important staple food crop. Despite its diverse utilities, the yield potential of cassava is greatly hampered by viral diseases and these differ from country to country, depending on the type of viruses present. Unfortunately, the recent sudden re-emergence of cassava brown streak disease (CBSD) in East and Central Africa is currently gaining more aggressive international attention in Africa and other concerned countries, due to the significant economic yield losses imparting to most poor resource farmers fields. However, selfless efforts from scientific researches to manage CBSD, including recommendations, still seems not to be complimented as expected with pro-active measures from relevant stakeholders, nevertheless the concerned farmers. Overall, the present review revisited a brief glance of the historical development of CBSD, progresses made so far with respect to management strategies. Even more, the paper suggests opinions which could be explore by the ones interested to help within research findings, as well as to bring the awareness and to prevent further spread in countries and/or regions where there is currently the outbreak of CBSD and which had not been yet affected.

scholarly journals Differential Tropism in Roots and Shoots of Resistant and Susceptible Cassava (Manihot esculenta Crantz) Infected by Cassava Brown Streak Viruses

Cells ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1221
Author(s):  
Samar Sheat ◽  
Paolo Margaria ◽  
Stephan Winter
Keyword(s):  
Virus Replication ◽  
Central Africa ◽  
Streak Virus ◽  
Virus Infections ◽  
Long Distance ◽  
Manihot Esculenta Crantz ◽  
Cassava Brown Streak Virus ◽  
Cassava Brown Streak Disease ◽  
Long Distance Movement ◽  
Brown Streak

Cassava brown streak disease (CBSD) is a destructive disease of cassava in Eastern and Central Africa. Because there was no source of resistance in African varieties to provide complete protection against the viruses causing the disease, we searched in South American germplasm and identified cassava lines that did not become infected with the cassava brown streak viruses. These findings motivated further investigations into the mechanism of virus resistance. We used RNAscope® in situ hybridization to localize cassava brown streak virus in cassava germplasm lines that were highly resistant (DSC 167, immune) or that restricted virus infections to stems and roots only (DSC 260). We show that the resistance in those lines is not a restriction of long-distance movement but due to preventing virus unloading from the phloem into parenchyma cells for replication, thus restricting the virus to the phloem cells only. When DSC 167 and DSC 260 were compared for virus invasion, only a low CBSV signal was found in phloem tissue of DSC 167, indicating that there is no replication in this host, while the presence of intense hybridization signals in the phloem of DSC 260 provided evidence for virus replication in companion cells. In neither of the two lines studied was there evidence of virus replication outside the phloem tissues. Thus, we conclude that in resistant cassava lines, CBSV is confined to the phloem tissues only, in which virus replication can still take place or is arrested.

scholarly journals Host and virus effects on reversion in cassava affected by cassava brown streak disease

2015 ◽  
Vol 65 (4) ◽  
pp. 593-600 ◽  
Author(s):  
I. U. Mohammed ◽  
S. Ghosh ◽  
M. N. Maruthi
Keyword(s):  
Cassava Brown Streak Disease ◽  
Brown Streak

Expansion of the cassava brown streak disease epidemic in eastern Democratic Republic of Congo

Plant Disease ◽  
2020 ◽  
Author(s):  
Clérisse Mubasi Casinga ◽  
Rudolph R Shirima ◽  
N M Mahungu ◽  
W Tata-Hangy ◽  
Kalinga Benoit Bashizi ◽  
...  
Keyword(s):  
Democratic Republic ◽  
Democratic Republic Of Congo ◽  
Smallholder Farmers ◽  
Central Africa ◽  
Virus Detection ◽  
Streak Virus ◽  
Republic Of Congo ◽  
Cassava Brown Streak Virus ◽  
Cassava Brown Streak Disease ◽  
Brown Streak

Cassava plays a key role in assuring food security and generating income for smallholder farmers throughout central Africa, and particularly in the Democratic Republic of Congo (DRC). This status is threatened, however, by cassava brown streak disease (CBSD) which has recently expanded its incidence and range in eastern DRC. The study described here, comprises the first extensive assessment of temporal change in occurrence of CBSD and its causal viruses in DRC, based on surveys conducted during 2016 and 2018. Cassava fields were inspected in Ituri, Nord-Kivu, Sud-Kivu, Tanganyika and Haut-Katanga provinces within eastern DRC, to record foliar incidence and severity of CBSD. Leaf samples were collected for virus detection and species-level identification. New occurrences of CBSD, confirmed by virus diagnostic tests, were recorded in two provinces (Haut-Katanga and Sud-Kivu) and nine previously unaffected territories, covering an area of > 62,000 km2, and at up to 900 km from locations of previously published reports of CBSD in DRC. Overall, average CBSD incidence within fields was 13.2% in 2016 and 16.1% in 2018. In the new spread zone of Haut-Katanga, incidence increased from 1.7% to 15.9%. CBSD is now present in provinces covering 321,000 km2 which is approximately 14% of the total area of DRC. This represents a major expansion of the CBSD epidemic, which was only recorded from one province (Nord-Kivu) in 2012. Both cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV) were detected in Ituri, Nord-Kivu and Sud-Kivu, but only CBSV was detected in Haut-Katanga. Considered overall, these results confirm the increasing threat that CBSD poses to cassava production in DRC and describe an important expansion in the African pandemic of CBSD.

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