scholarly journals VIRUS DISTRIBUTION IN FIELD GROWN SWEETPOTATO VINES IN AFRICA

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 517C-517
Author(s):  
D.W. Miano ◽  
D. R. LaBonte ◽  
C. A. Clark
Keyword(s):  
Sweet Potato ◽  
Virus Disease ◽  
Major Constraint ◽  
Potato Virus Disease ◽  
Small Holder Farmers ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease ◽  
Small Holder ◽  
Infected Vine ◽  
Virus Distribution

Sweet potato virus disease (SPVD) is a major constraint to sweetpotato production in East Africa. The disease is a result of co-infection with sweet potato feathery mottle virus (SPFMV) and sweet potato chlorotic stunt virus (SPCSV). Some local sweetpotato genotypes have been reported to recover from, or have localized distribution of SPVD, suggesting that the disease is not fully systemic. This has led to the suggestion that uninfected cuttings may be obtained from previously infected plants. Experiments were set to determine the possibility of obtaining cuttings long enough for propagation that are free from virus infection. This would form a basis for recommending to the local small-holder farmers of a way to reduce losses due to the disease. Field grown sweetpotato vines were cut into three pieces (15, 15 to 30, and >30 cm from the apex) and tested for SPCSV and SPFMV. Nine genotypes were selected from a group of 21 local clones and used for this study. The two viruses were equally present in all the three sections of infected vines, indicating that it is not easy to obtain a virus free cutting for field propagation from an infected vine.

Control strategies for sweet potato virus disease in Africa

2004 ◽  
Vol 100 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Richard W. Gibson ◽  
Valentine Aritua ◽  
Emmanuel Byamukama ◽  
Isaac Mpembe ◽  
James Kayongo
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Control Strategies ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

scholarly journals Evaluation of Selected Zambian Popular Sweet Potato Genotypes for Response to Sweet Potato Virus Disease

2020 ◽  
pp. 44-51
Author(s):  
Joseph Banda ◽  
Patrick Chiza Chikoti ◽  
Langa Tembo
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Beta Carotene ◽  
Yield Reduction ◽  
Tuber Weight ◽  
Carotene Content ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

Aim: The objective of this study was to determine the effect of sweet potato virus disease (SPVD) on the beta carotene content, tuber weight and vine weight of selected popular sweet potato genotypes. Study Design: The experiment was laid as a randomized complete block design (RCBD) with three replications. Place and Duration of Study: The experiment was conducted for two cropping seasons (2015/16 and 2016/17) at the Zambia Agriculture Research Institute in Chilanga district of Zambia. Methodology: The uninfected (control) genotypes of Kanga, Chiwoko and Chingovwa were evaluated alongside their SPVD infected genotypes. Genotypic infection was confirmed using molecular approaches, and data was collected at harvest on beta carotene content, tuber weight and vine weight. Results: The results showed that SPVD affects the yield and beta carotene content of sweet potato. Significant differences (P< .001) for yield performance and beta carotene were observed. The yield reduction in percentage across seasons for all genotypes between the uninfected and infected genotypes ranged from 77% to 79% and 67% to 76% for tuber weight and vine weight respectively. Only Chiwoko exhibited higher levels of beta carotene among the genotypes. However, the SPVD infected Chiwoko genotype compared to the uninfected treatment produced mean beta carotene content of 39.1 µg/g and 91.5 µg/g respectively. Conclusion: SPVD reduces the tuber weight, vine weight and beta carotene content in infected sweet potato genotypes.

scholarly journals Symptoms, aetiology and serological analysis of sweet potato virus disease in Uganda

1998 ◽  
Vol 47 (1) ◽  
pp. 95-102 ◽  
Author(s):  
R. W. Gibson ◽  
I. Mpembe ◽  
T. Alicai ◽  
E. E. Carey ◽  
R. O. M. Mwanga ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Serological Analysis ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

Effects of Sweet Potato Virus Disease (SPVD) on the Yield of Sweet Potato Genotypes in Cameroon

1991 ◽  
Vol 27 (2) ◽  
pp. 221-225 ◽  
Author(s):  
J. M. Ngeve ◽  
J. C. Bouwkamp
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Yield Reduction ◽  
Storage Roots ◽  
Potato Varieties ◽  
Severity Rating ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

SummarySweet potato virus disease (SPVD) causes strap-shaped leaves, vein-clearing, puckering, chlorosis and stunting in susceptible sweet potato varieties and yields are much reduced. To investigate the tolerance of genotypes and obtain a better appraisal of yield loss caused by SPVD, eight sweet potato varieties showing symptoms of SPVD were studied for two years in an area where SPVD is severe. Two varieties, although showing symptoms, were tolerant of the disease; their yields were not significantly depressed by SPVD. Among the remaining six varieties, storage root fresh yields were reduced by 56–90% in plants showing SPVD symptoms. Marketable yields, as well as total and marketable numbers of storage roots were similarly depressed by SPVD in the less tolerant varieties. Significant correlations were found between disease severity rating and yield reduction among cultivars.

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