Performances of improved cassava (<i>Manihot esculenta</i>Crantz) cultivars against root rot disease and yield in cassava-maize intercropping systems under natural infection

Awoyemi, S. O.; Afolabi, C. G.; Popoola, A. R.; Odedina, Joy Nwakaego; Adigbo, Sunday Ojo

doi:10.1080/03235408.2016.1221561

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…The maize crop showed a higher rate of disease and colonization by pathogens on the cuttings, it is worth mentioning that maize cultivation is frequent in monoculture, generating an increase in the incidence of pathogen populations, and in the present study this situation was confirmed, corroborating the results found by Awoyemi et al, (2016) in which the intercropping of maize with cassava does not have management potential in the development of root rot. However, it differs from what was found by Barros et al, (2014) andDe Medeiros et al, (2019) who presented it as one of the possible plant covers that can influence soil suppression when intercropped with beans and cassava; however, the planting of this plant was for a long period, unlike what happened in the present study.…”

Section: Discussionsupporting

confidence: 91%

Effect of cover crops on the suppressiveness of root rot and on the agronomic characteristics of cassava

Sousa,

Diamantino,

Hohenfeld

et al. 2023

Preprint

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Cassava (Manihot esculenta Crantz) is a major staple food in many developing countries, including Brazil. However, it faces significant challenges from diseases like dry root rot (DRR) and black root rot (BRR) caused by soil-borne fungi. This study explores the use of cover crops to suppress these diseases and improve cassava's agronomic traits. Over four cultivation cycles, various cover crops were alternated with cassava varieties 'BRS Kiriris' (resistant) and 'BRS Formosa' (susceptible) in soil infested with DRR and BRR pathogens. In the 2nd cycle, only germination showed significant differences, but by the 4th cycle, various agronomic parameters, including fresh weight (FW.AP), dry weight (DW.AP) of the aerial part, fresh weight (FW.Root), dry weight (DW.Root) of the roots, and plant vigor, exhibited significant improvements. Cowpeas were identified as the most effective cover crop in disease reduction (ID%) and promoting healthier and taller cassava plants. Jack beans and peanuts also had positive effects on vigor, FW.AP, DW.AP, FW.root, and DW.root. In contrast, cover crops like maize, black oats, Crotalaria ochroleuca, cassava, and fallow soil had minimal impacts. Throughout the cycles, these selected cover crops consistently contributed to disease reduction and improved cassava's agronomic characteristics. This research highlights their potential in holistic disease management strategies.

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Section: Discussionsupporting

confidence: 91%

Effect of cover crops on the suppressiveness of root rot and on the agronomic characteristics of cassava

Sousa,

Diamantino,

Hohenfeld

et al. 2023

Preprint

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“…The soft rot severity was rated on a scale of 0 to 5 according to Awoyemi et al (2016). 0= no visible symptoms (non-virulence).…”

Section: Disease Severity Ratingmentioning

confidence: 99%

Evaluation of stored potato (Solanum tuberosum L.) for soft rot bacteria in Ibadan, Nigeria

Abiodun¹,

Abisola

2021

JAAB

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Potato (Solanum tuberosum L.) is a tuberous crop from the Sola-naceae family which is a source of starch and food to many in Nige-ria, however, its production is being hampered in field and storage by bacterial pathogen which causes rot of the stored tubers. To this end, the study aimed at screening potatoes from different stores within Ibadan for the evaluation and diversity of bacteria pathogens responsible for rot in potatoes. Damaged stored potato samples were collected from different locations in Ibadan for studies, these samples were isolated for bacterial pathogen and characterized bio-chemically and observed under the microscope for identification. Three genera of bacteria were observed to be responsible for potato rot in the study and they include Pectobacterium carotovorum, Pseu-domonas syringae and Ralstonia solanacearum. Of all the isolated bacteria, Pectobacterium carotovorum has the highest occurrence with a frequency of 60%, while Pseudomonas syringae has a fre-quency of 33% and Ralstonia solanacearum has a frequency of 27%. The pathogenicity of the isolates were tested and this revealed that Pectobacterium carotovorum is the most virulent with a severity score of 4.3, while Ralstonia solanacearum follows with a score of 3.3 and a score of 2.7 was recorded for Pseudomonas syringae, while the control had a score of 0. The diversity and differences shown in the isolated bacteria indicated that potato rot is a serious disease which is caused by different bacteria and need an integrated ap-proach for its control from the field of harvesting to the storage house.

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“…The main strategy for root rot control involves the use of resistant varieties. This is considered the most effective management strategy due to its high cost-benefit ratio resulting from low environmental impact and easy adoption by producers [ 7 , 10 , 20 , 21 ]. Furthermore, other integrated disease management practices remain incipient, such as the use of biological or chemical controls and even the induction of soil suppressiveness through the addition of organic matter [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, other integrated disease management practices remain incipient, such as the use of biological or chemical controls and even the induction of soil suppressiveness through the addition of organic matter [ 22 ]. However, the presence of different plant pathogen genera in the same crop area leads to the need to develop cassava varieties that are multi-resistant to the root rot complex [ 10 , 16 , 18 , 19 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…Screening in areas with a history of high disease pressure contributes significantly to the identification of parentals with good genetic resistance or even genotypes that can be promptly used in environments with a history of root rot disease [ 7 , 21 ]. Although phenotyping in the field is costly, this approach facilitates more direct and consistent selection, since it is possible to evaluate a larger number of genotypes concomitantly, immediately exclude those that are highly susceptible, and perform selections based on the agronomic characteristics of interest for the target environments [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Genome-wide association study and selection for field resistance to cassava root rot disease and productive traits

et al. 2022

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Cassava root rot disease is caused by a complex of soil-borne pathogens and has high economic impacts because it directly affects the tuberous roots, which are the main commercial product. This study aimed to evaluate cassava genotypes for resistance to root rot disease in a field with a previous history of high disease incidence. It also aimed to identify possible genomic regions associated with field resistance based on genome-wide association studies. A total of 148 genotypes from Embrapa Mandioca and Fruticultura were evaluated over two years, including improved materials and curated germplasms. Analysis of phenotypic data was conducted, as well as a genomic association analysis, based on the general linear model, mixed linear model, and fixed and random model circulating probability unification. The observed high disease index (ω) was directly correlated with genotype survival, affecting plant height, shoot yield, and fresh root yield. The genotypes were grouped into five clusters, which were classified according to level of root rot resistance (i.e., extremely susceptible, susceptible, moderately susceptible, moderately resistant, and resistant). The 10 genotypes with the best performance in the field were selected as potential progenitors for the development of segregating progenies. Estimates of genomic kinship between these genotypes ranged from -0.183 to 0.671. The genotypes BGM-1171 and BGM-1190 showed the lowest degree of kinship with the other selected sources of resistance. The genotypes BGM-0209, BGM-0398, and BGM-0659 showed negative kinship values with most elite varieties, while BGM-0659 presented negative kinship with all landraces. A genome-wide association analysis detected five significant single nucleotide polymorphisms related to defense mechanisms against biotic and abiotic stresses, with putative association with fresh root yield in soil infested with root rot pathogens. These findings can be utilized to develop molecular selection for root rot resistance in cassava.

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Performances of improved cassava (Manihot esculentaCrantz) cultivars against root rot disease and yield in cassava-maize intercropping systems under natural infection

Cited by 6 publications

References 7 publications

Effect of cover crops on the suppressiveness of root rot and on the agronomic characteristics of cassava

Effect of cover crops on the suppressiveness of root rot and on the agronomic characteristics of cassava

Evaluation of stored potato (Solanum tuberosum L.) for soft rot bacteria in Ibadan, Nigeria

Genome-wide association study and selection for field resistance to cassava root rot disease and productive traits

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