Evaluation of Cassava Genotypes for Agronomic Performance, Correlation with CMD and CBSD Parameters and Stability across Alupe, Kakamega and Kibos in Western Kenya

Navangi, L. N.; Githiri, S. M.; Ateka, Elijah; Kanju, Edward; Munga, T. L.; Tumwegamire, Silver; Otsyula, Reuben; Kwena, Philip Onyimbo.; Woyengo, Vincent; Malinga, J.; Okitoi, L O

doi:10.9734/jeai/2020/v42i230469

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…Crops that differ in genetic makeup perform differently toward certain attributes such as pest and disease resistance (Kover & Schaal, 2002). The current study has con rmed observations from several other studies in which cultivars performed differently toward CMD, CBSD and white y resistance (Kaweesi et al, 2014;Navangi et al, 2020;Shirima et al, 2020). This is not unusual considering that Malawi has high diversity of cassava (Benesi, 2005).…”

Section: Discussionsupporting

confidence: 86%

Resistance levels of cassava landraces to CMD, CBSD and vector whiteflies in Malawi

Musopole¹,

Mtonga²,

Maruthi

2023

Preprint

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Cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) have been two major threats to cassava production in eastern and southern Africa. This study was designed to identify CMD- and CBSD-resistant cassava landraces and farmer-preferred varieties in Malawi for effective disease control. Thirty cassava landraces were collected from 17 districts across Malawi and evaluated for disease resistance a field experiment at the Chitala Research Station in a randomized complete block design (RCBD). Cultivars Mbundumali and Pwani were used as susceptible and resistant controls, respectively. Data collected on foliar and root disease symptoms indicated that CMD was more prominent than CBSD during the study. Cultivars Pwani, Mkumba, R23-Sangwala, Sagonja, R31-Kamphunobi, R33-Chimphuno, R76-Kamphuno, MZ126, and R63-2020 showed relative dual resistance to both CMD and CBSD with the highest incidence of 25 and 18%, respectively. Some cultivars showed resistance to one disease and not the other. The lowest cumulative number of whiteflies (0.68 per plant) was observed on Pwani while the highest was seen on R42-Mwenemisuku with 6.33 per plant. However, various cultivars supported varied numbers of whiteflies and nymphs. Assessing relative virus quantities of the prevailing viruses, East African cassava mosaic virus (EACMV) and Cassava brown streak virus (CBSV) indicated that Pwani, Mkumba and Sagonja supported lowest amount of EACMV and CBSV. Our results collectively identified the presence of dual-resistant cassava which can be further exploited for managing both CMD and CBSD in Malawi.

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Section: Discussionsupporting

confidence: 86%

Resistance levels of cassava landraces to CMD, CBSD and vector whiteflies in Malawi

Musopole¹,

Mtonga²,

Maruthi

2023

Preprint

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Variation among cassava (Manihot esculenta Crantz) genotypes for storage root yield, yield components and response to cassava mosaic disease at advanced breeding stage

Mahamane,

Olasanmi,

Oluwadamilola

et al. 2023

Preprint

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Cassava is a crucial starchy root crop cultivated worldwide in tropical and subtropical areas. Its preferred traits are continually been improved to enhance food and nutritional security. However, adoption of new varieties of cassava can be influenced by its yield performance which can be affected by cassava mosaic disease (CMD). This study was therefore conducted to evaluate the performance of selected cassava genotypes at advanced breeding stage across two years. Using a randomized complete block design with two replications, 16 genotypes; a yellow root variety (TMS07/0593) and a white root (TMS30572) as checks were evaluated for yield, yield related traits and response to CMD. There were highly significant (P < 0.001) variations among the cassava genotypes for yield-related traits but no genetic variation was reported for fresh root yield and dry root yield. The effect of season and genotypes x season interaction on all traits was not significant except season for harvest index. Genotype UIC-17-2428 and the two national check varieties (TMS07/0593 and TMS30572) did not exhibit complete resistance to CMD. At harvest, genotype UIC-17-2031 had the highest fresh root yield (39.0 t/ha), dry root yield (10.5 t/ha), and harvest index (0.63). Genotype UIC-17-58 had the highest dry matter content (37.2%) at harvesting followed by UIC-17-46 (36.4%) while genotype UIC-17-583 had the lowest value (22.8%). The genotypes evaluated have promising premium agronomic traits. Genotypes with outstanding dry root yield need to be evaluated across multiple environments to assess their stability.

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Evaluation of Cassava Genotypes for Agronomic Performance, Correlation with CMD and CBSD Parameters and Stability across Alupe, Kakamega and Kibos in Western Kenya

Cited by 2 publications

References 28 publications

Resistance levels of cassava landraces to CMD, CBSD and vector whiteflies in Malawi

Resistance levels of cassava landraces to CMD, CBSD and vector whiteflies in Malawi

Variation among cassava (Manihot esculenta Crantz) genotypes for storage root yield, yield components and response to cassava mosaic disease at advanced breeding stage

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