Effects of cassava genotype, climate and the Bemisia tabaci vector population on the development of African cassava mosaic geminivirus (ACMV)

Abdullahi, Ismail; Atiri, GI; Dixon, GO

doi:10.1556/aagr.51.2003.1.5

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…These authors noted afterwards that the level of CMD severity depended on several factors such as the cultivar, climatic conditions, and growing season. According to Abdullahi et al [21], the differences observed in CMD incidence and severity among cassava clones are due to genotypic factors. In the present study, the CMD gravity remained below 21% for improved varieties while reaching 100% for some local varieties at 6 MAP.…”

Section: Discussionmentioning

confidence: 99%

Assessing Reactions of Genetically Improved and Local Cassava Varieties to Cassava Mosaic Disease (CMD) Infection in a Savannah Region of the DR-Congo

Muengula-Manyi¹,

Mukwa²,

Nkongolo³

et al. 2013

AJPS

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The responses of eight genetically improved and eight local cassava varieties to cassava mosaic disease (CMD) were evaluated under field conditions at two sites, in Eastern Kasaï, region of the DR-Congo). The varieties were planted using randomized complete block design with three replications. The rate of cuttings sprouted varied significantly from variety to variety and from location to location. Local varieties were severely infected than improved varieties throughout the trial period. In general, the level of CMD incidence for genetically improved varieties was below 15% while it reached 100% for the local cassava varieties six months after planting (MAP). This trend was also observed for the CMD severity and gravity. The mean scores for CMD severity were 2 and 3.6 for genetically improved and local varieties, respectively at 6 MAP. CMD gravity for improved varieties was below 21% for genetically improved varieties and exceeded 85% for local varieties at the end of trials. Area Under the Severity index Progress Curve (AUSiPC) and Area Under Disease Progress Curve (AUDPC) estimates confirmed that improved varieties were moderately infested comparatively to local varieties. Molecular analysis is being conducted to determine the genetic variability and complexity of the cassava mosaic virus strains involved.

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Section: Discussionmentioning

confidence: 99%

Assessing Reactions of Genetically Improved and Local Cassava Varieties to Cassava Mosaic Disease (CMD) Infection in a Savannah Region of the DR-Congo

Muengula-Manyi¹,

Mukwa²,

Nkongolo³

et al. 2013

AJPS

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“…This is consistent with previous studies. In fact, several studies conducted on the impact of CMD on cassava in Africa reported that the incidence of this disease varies according to agroecological site, planted varieties, plant age and weather conditions (Abdullahi et al, 2003;Legg et al, 2006;Ntawuruhunga et al, 2007). Arraudeau (1987) suggested that a reduction of nitrogen fertilizer combined with an increase of potassium can limit the effects of CMD.…”

Section: Discussionmentioning

confidence: 99%

Effect of NPK Fertilization on Cassava Mosaic Disease (CMD) Expression in a Sub-Saharan African Region

Muengula-Manyi¹,

Nkongolo

Bragard³

et al. 2012

AJEA

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The influence of NPK fertilizer on the incidence, severity and gravity of cassava mosaic disease (CMD) was investigated using eight genetically improved cassava varieties and eight local farmer's varieties. The study was carried out in a savannah region (Gandajika) in D.R. Congo at two locations. The varieties were planted with and without NPK fertilization. Application of NPK fertilizer significantly (P<0.05) increased CMD incidence, severity (AUDPC) and gravity overtime compared to the trials without fertilizers for all the improved cassava varieties evaluated. The CMD incidence remained below 30% of infected plants for improved cassava varieties and reached 100% of plants for local varieties during the six months trial. The same trend was observed for CMD gravity (number of infected leaves per plant) that was below 50% for improved varieties while reaching 100% for all the local varieties at 6 MAP. High incidence and gravity of CMD were observed on local varieties just one month after planting. NPK fertilizers increased significantly the CMD incidence and gravity compared to control site during the first month after plantation. Thereafter, the effect of NPK fertilizer on CMD symptom expression was not noticeable since all the plants from local varieties were infected regardless of the fertilization regimen.

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“…Since whiteflies are the vectors of CMD, their population on cassava plants were determined in order to assess their relationship with the severity of the CMD disease infection. Direct counts of adult whiteflies on the crop were made as previously described (Hill, 1968;Fargette et al, 1985;Abdullahi et al, 2003).…”

Section: Determination Of Population Of Whiteflymentioning

confidence: 99%

Phenotypic and molecular screening of cassava (Manihot esculentum Crantz) genotypes for resistance to cassava mosaic disease

Asare¹,

Galyuon²,

Asare‐Bediako³

et al. 2014

J. Gen. Mol. Virol.

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Cassava mosaic disease (CMD), caused by cassava mosaic geminivirus (CMG) is the most-important disease threatening production of cassava (Manihot esculenta) in Ghana. The disease is best managed through host-plant resistance. The study was conducted to assess resistance of 38 cassava genotypes to CMD, determine the associated resistance gene, and to identify the strains of CMG infecting cassava in Ghana. Both morphological and molecular markers were used to screen 38 cassava accessions against CMG infection. Morphological studies revealed one genotype (Capevars) as highly resistant whilst three others (Adehye, Nkabom and KW085) were tolerant, showing mild symptoms. PCR analyses using strain specific primers, however, detected the virus in all the three tolerant genotypes, but absent in Capevars. However, the dominant CMD resistance gene, CMD2, was detected in both the resistant and the tolerant genotypes. Apart from Capevars, the other 37 cassava genotypes were infected by, at least, one of the four ACMV variants of ACMV1, ACMV2, ACMV-AL and ACMV3. It is, therefore, concluded that field screening for CMD resistance, should integrate phenotypic evaluation and detection of the virus.

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Effects of cassava genotype, climate and the Bemisia tabaci vector population on the development of African cassava mosaic geminivirus (ACMV)

Cited by 5 publications

References 16 publications

Assessing Reactions of Genetically Improved and Local Cassava Varieties to Cassava Mosaic Disease (CMD) Infection in a Savannah Region of the DR-Congo

Assessing Reactions of Genetically Improved and Local Cassava Varieties to Cassava Mosaic Disease (CMD) Infection in a Savannah Region of the DR-Congo

Effect of NPK Fertilization on Cassava Mosaic Disease (CMD) Expression in a Sub-Saharan African Region

Phenotypic and molecular screening of cassava (Manihot esculentum Crantz) genotypes for resistance to cassava mosaic disease

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