R. D. Narla
YOU?
Author Swipe
View article: African Journal of Agricultural Research
African Journal of Agricultural Research Open
Fusarium wilt, caused by Fusarium oxysporum F. sp. phaseoli caused growers to abandon the most popular climbing bean cultivar, Umubano (G2333) in Rwanda. The present objective was to determine the nature of inheritance of fusarium wilt res…
View article: Improving Sugarcane Production Through Temperature-Optimized Hydrothermotherapy of Ratoon Stunt
Improving Sugarcane Production Through Temperature-Optimized Hydrothermotherapy of Ratoon Stunt Open
View article: Heterosis, combining ability and reaction of tomato parental lines and their F1 hybrids to bacterial wilt caused by Ralstonia solanacearum in Kenya
Heterosis, combining ability and reaction of tomato parental lines and their F1 hybrids to bacterial wilt caused by Ralstonia solanacearum in Kenya Open
Strategies to manage bacterial wilt disease causing 64-100% yield loss have limited effectiveness. A 10×10 diallel mating design excluding reciprocals and self was employed in this study to evaluate combing ability effects, heterosis, and …
View article: Shelf-Life and Processing Quality of Five Parental Lines and Four F1 Hybrids Developed in Kenya
Shelf-Life and Processing Quality of Five Parental Lines and Four F1 Hybrids Developed in Kenya Open
View article: First report of <i>Ethiopian tobacco bushy top virus</i> and its associated satellite RNA in mixed infection with <i>Potato virus Y</i> infecting <i>Solanum betacea</i> in Kenya
First report of <i>Ethiopian tobacco bushy top virus</i> and its associated satellite RNA in mixed infection with <i>Potato virus Y</i> infecting <i>Solanum betacea</i> in Kenya Open
Virus-associated symptoms including leaf malformation, curling and vein banding, mosaics, yellowing, mottling were observed in tree tomato (Solanum betacea) farms in Kenya. A survey was conducted in four counties (Machakos, Embu, Tharaka N…
View article: Biochar and vermicompost soil amendments reduce root rot disease of common bean (Phaseolous Vulgaris L.)
Biochar and vermicompost soil amendments reduce root rot disease of common bean (Phaseolous Vulgaris L.) Open
<p>Common bean production is constrained by root rot complexes resulting to as much as 70% losses in Kenya. This study sought to establish the effect of soil amendments biochar and vermicompost on root rot fungal pathogens of commonb…
View article: Mechanisms of biochar and vermicompost in suppression of root rot fungal disease of common bean (Phaseolus vulgaris L)
Mechanisms of biochar and vermicompost in suppression of root rot fungal disease of common bean (Phaseolus vulgaris L) Open
Composts and biochar improve soil fertility and also suppress fungal soil-borne diseases through their ability to promote beneficial microbial communities. The study sought to determine the mechanisms through which biochar and vermicompost…
View article: Biochar and vermicompost soil amendments reduce root rot disease of common bean (Phaseolous Vulgaris L.)
Biochar and vermicompost soil amendments reduce root rot disease of common bean (Phaseolous Vulgaris L.) Open
Common bean production is constrained by root rot complexes resulting to as much as 70% losses in Kenya.This study sought to establish the effect of soil amendments biochar and vermicompost on root rot fungal pathogens of common bean in We…
View article: Validation of effectiveness marker-assisted gamete selection for multiple disease resistance in common bean
Validation of effectiveness marker-assisted gamete selection for multiple disease resistance in common bean Open
Plant breeding is the most cost-effective, practical and environmentally friendly strategy for reducing losses associated with bean diseases, especially in low-input agricultural systems because no additional investment is required from fa…
View article: Genetic inheritance of photoperiod sensitivity in Runner bean (Phaseolus coccineous L.)
Genetic inheritance of photoperiod sensitivity in Runner bean (Phaseolus coccineous L.) Open
Lack of information on the mode of inheritance of photoperiod sensitivity is a constraint to genetic improvement of tropically adapted vegetable runner bean. This study was conducted to determine the inheritance of short-day photoperiod in…
View article: Yield stability in small red inter-racial common bean lines in Kenya
Yield stability in small red inter-racial common bean lines in Kenya Open
Agronomic performance of new common bean (Phaseolus vulgaris L.) varieties may vary considerably in diverse agro-ecological zones, due to genotype-environment (G x E) interactions. A multi-site evaluation is, therefore, crucial in elite li…
View article: Biopesticide-based IPM systems to reduce synthetic pesticide residues in vegetables for niche market access by small holder growers
Biopesticide-based IPM systems to reduce synthetic pesticide residues in vegetables for niche market access by small holder growers Open
In the last few decades, farmers have relied on synthetic pesticides to managed crop pests and diseases. This is because synthetic pesticides are easily available, have quick knock down effect, have varied modes of action and are reliable.…
View article: Breeding runner bean for short‐day adaptation, grain yield, and disease resistance in eastern Africa
Breeding runner bean for short‐day adaptation, grain yield, and disease resistance in eastern Africa Open
Runner bean ( Phaseolus coccineus L.), also known as butter bean in Kenya, is a high value vegetable and grain crop traditionally grown in high altitudes (>1,800 m) of eastern Africa for domestic consumption and processing. However, it has…
View article: Genotype x Environment Interactions on Seed Yield of Inter-racial Common Bean Lines in Kenya
Genotype x Environment Interactions on Seed Yield of Inter-racial Common Bean Lines in Kenya Open
Determination of yield stability is critical in identifying new common bean cultivars with either specific or broad adaptation in target environments. This study aimed to assess genotype by environment (G x E) effects on agronomic performa…
View article: Effect of Legume Extracts on Germination, Seedling Health of Beans (Phaseolus vulgaris L.) and Soil Microorganisms
Effect of Legume Extracts on Germination, Seedling Health of Beans (Phaseolus vulgaris L.) and Soil Microorganisms Open
Application of undecomposed green manure has been reported to cause poor emergence and establishment of common beans in the field. Therefore, to understand the mechanisms’ contributing to the poor crop establishment, the effect of extracts…
View article: Response of Selected Potato Genotypes to Natural Virus Infection in the Field
Response of Selected Potato Genotypes to Natural Virus Infection in the Field Open
Potato viruses are one of the major biotic factors causing high yield losses in potato production fields. In contrast to other disease causing pathogens, potato viruses’ lack well documented chemical control strategy and hence difficult to…
View article: Screening of locally available organic materials as substrates for production of Pochonia chlamydosporia in Kenya
Screening of locally available organic materials as substrates for production of Pochonia chlamydosporia in Kenya Open
View article: Effect of Time after Incorporation of Lablab Green Manure on Root Rot Pathogens and Establishment of Common Bean ( Phaseolus vulgaris L.)
Effect of Time after Incorporation of Lablab Green Manure on Root Rot Pathogens and Establishment of Common Bean ( Phaseolus vulgaris L.) Open
Green manure incorporation is important for restoration of soil quality, particularly buildup of organic matter and supply of nutrients to plants. However, undecomposed plant residues reduce crop establishment and plant stand. Therefore, t…
View article: Genotypic Performance of Short-Day Runner Bean (Phaseolus coccineus L.) Lines Combining High Grain Yield and Disease Resistance
Genotypic Performance of Short-Day Runner Bean (Phaseolus coccineus L.) Lines Combining High Grain Yield and Disease Resistance Open
Runner bean (Phaseolus coccineus L.) offers a great potential as a grain legume in Africa. However, its productivity is low because no improved short-day varieties are available. The aim of this study was to evaluate advanced short-day run…
View article: Seasonal dynamics and alternate hosts of thrips transmitted Iris yellow spot virus in Kenya
Seasonal dynamics and alternate hosts of thrips transmitted Iris yellow spot virus in Kenya Open
Thrips-transmitted Iris yellow spot virus (IYSV) (Family Tospoviridae, Genus Orthotospovirus) is a major constraint to onion (Allium cepa L.) production in Kenya. Determining seasonal patterns of the vector and alternate hosts of the virus…
View article: Effectiveness of Positive Selection in Managing Seed-Borne Potato Viruses
Effectiveness of Positive Selection in Managing Seed-Borne Potato Viruses Open
Potato productivity in Kenya has remained below the potential due to the use of infected seed tubers especially by seed borne viruses. A study was carried out to asses the effectiveness of Positive Selection (PS) in managing seed borne pot…
View article: Seed Potato Production Practices and Quality of Farm Saved Seed Potato in Kiambu and Nyandarua Counties in Kenya
Seed Potato Production Practices and Quality of Farm Saved Seed Potato in Kiambu and Nyandarua Counties in Kenya Open
Potato production in Kenya is mainly constrained by limited supply of quality seed potato tubers. The objective of this study was to determine seed potato handling practices and quality of farm saved seed potato. A survey involving 79 farm…
View article: In vitro activity of plant extracts against some important plant pathogenic fungi of tomato
In vitro activity of plant extracts against some important plant pathogenic fungi of tomato Open
Indiscriminate use of synthetic pesticides has resulted in loss of access to niche markets due to presence of chemical residues in fresh vegetable produce.There is need for safe alternatives to synthetic pesticides in management of pests a…