Dwasi Matondo - Academia.edu (original) (raw)
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The University of the West Indies at St. Augustine Trinidad and Tobago
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Papers by Dwasi Matondo
Journal of plant diseases and protection, Mar 20, 2024
Virus Research, 2020
Highlights • 17 cultivars from 5 countries evaluated for CBSD resistance at 9 sites in Tanzania.•... more Highlights • 17 cultivars from 5 countries evaluated for CBSD resistance at 9 sites in Tanzania.• Site differences in disease pressure and vector abundance drove CBSD spread.• Seven cultivars were identified with strong resistance to CBSD.• CBSD-susceptible cultivars gave high yields at low disease pressure sites.• CBSD control should combine host plant resistance with phytosanitary measures.
Cassava productivity is hampered by pests and diseases including cassava mosaic disease (CMD) and... more Cassava productivity is hampered by pests and diseases including cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). The main objective of this study was to identify stable superior genotypes that combine disease resistance and high yield. Sixteen cassava genotypes were planted in a randomized complete block design with three replications for six planting seasons (years) at five sites in Tanzania. The genotypes were assessed using the additive main effect and multiplicative interaction (AMMI) analysis, and highly significant (P < 0.001) effects of genotype, environment, and genotype-by-environment (G*E) interactions were observed for all traits studied. Percent sum of squares (SS) due to environment (12.66% - 85.23%) was the highest followed by G*E (14.12% - 39.56%) for CMD foliar symptoms, root weight and dry matter. On the other hand, % SS due to genotype (52.14% - 69.14%) was highest followed by G*E (26.14% - 35.91%) for CBSD foliar and root symptoms indicati...
Journal of plant diseases and protection, Mar 20, 2024
Virus Research, 2020
Highlights • 17 cultivars from 5 countries evaluated for CBSD resistance at 9 sites in Tanzania.•... more Highlights • 17 cultivars from 5 countries evaluated for CBSD resistance at 9 sites in Tanzania.• Site differences in disease pressure and vector abundance drove CBSD spread.• Seven cultivars were identified with strong resistance to CBSD.• CBSD-susceptible cultivars gave high yields at low disease pressure sites.• CBSD control should combine host plant resistance with phytosanitary measures.
Cassava productivity is hampered by pests and diseases including cassava mosaic disease (CMD) and... more Cassava productivity is hampered by pests and diseases including cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). The main objective of this study was to identify stable superior genotypes that combine disease resistance and high yield. Sixteen cassava genotypes were planted in a randomized complete block design with three replications for six planting seasons (years) at five sites in Tanzania. The genotypes were assessed using the additive main effect and multiplicative interaction (AMMI) analysis, and highly significant (P < 0.001) effects of genotype, environment, and genotype-by-environment (G*E) interactions were observed for all traits studied. Percent sum of squares (SS) due to environment (12.66% - 85.23%) was the highest followed by G*E (14.12% - 39.56%) for CMD foliar symptoms, root weight and dry matter. On the other hand, % SS due to genotype (52.14% - 69.14%) was highest followed by G*E (26.14% - 35.91%) for CBSD foliar and root symptoms indicati...