Abstract
In Cameroon, common bean is produced and highly consumed as a source of protein and means of generating income by small farm holders. However, diseases like angular leaf spot caused by Phaeoisariopsis griseola (Sacc), poor agronomic practices and low soil fertility are negatively impacting the production of the crop. A field experiment was conducted under natural conditions in the University of Dschang during the 2017 main cropping season. The experiment was laid out in a RCBD in a split-split plot arrangement with three replications: Fungicide application (sprayed and unsprayed); Fertilizer level: F1 (Control), F2 (10 t/ha Tithonia), F3 (3.5 t/ha poultry manure) and F4 (0.4 t/ha 14.24.14 NPK fertilizer). Bean varieties that occupied each experimental unit were V1 (GLP-190 S), V2 (PH201) and V3 (PNG). There was a significant difference (P<0.05) between sprayed and unsprayed plots with respect to disease severity. The highest number of pods was obtained from the Tithonia treatment (F2) while the lowest was gotten from the mineral fertilizer treatment (F4). As concerns the interactions, fertilization and variety, spray and variety, there was a significant difference (P<0.05) among the various components. In all varieties, sprayed plots had more pods, seed weight, 100-seed weight compared to unsprayed plots. From the study, it shows that fungicide treatment reduced disease severity and the different nitrogen fertilizers greatly improved yield components of the crop. Key words: Angular leaf spot, common bean, fungicide spray, nitrogen fertilizers, Western Highlands, yield components.  
Highlights
Common bean (Phaseolus vulgaris L.) is a major grain legume crop grown worldwide for its nutritional value (Amin et al, 2014), supplying about 20% of the protein intake per person worldwide (CIAT, 2001)
Amin et al (2014) working on anthracnose disease of common bean concluded that plots which received various fungicide treatments significantly reduced disease severity
According to Mboussi et al (2012), this characteristic which is variety specific can be influenced by environmental factors like diseases and drought that can reduce the grain mass. It showed that the application of increasing doses of both organic and inorganic fertilizer produced significant effects for all yield components. These results corroborate with the results presented by Zucareli et al (2006) and Pela et al (2009) who reported significant increases in yield components of common bean with increasing rates of fertilizer application
Summary
Common bean (Phaseolus vulgaris L.) is a major grain legume crop grown worldwide for its nutritional value (Amin et al, 2014), supplying about 20% of the protein intake per person worldwide (CIAT, 2001). In Cameroon, common beans is mainly cultivated and marketed in the Western Highlands of Cameroon (Tatchago, 1987; Siri et al, 2017) This region contributes more than 90% of the national bean production (Anonymous, 2010). It is grown for its high nutritional value and potential as a source of income for the smallholder farmer. Yield losses due to ALS have been estimated at 50% in USA, 70% in Brazil and 80% in Columbia and Cameroon (Tiomo, 1994; Jesus et al, 2001) Different management options such as use of resistant varieties, use of disease free seeds, fungicide application and crop rotation are known to be the ideal way to manage this disease (Mekonen, 2017). Nitrogen is the most important element limiting crop production in the tropics
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