Assessment of the management of pests and diseases of vines and fruits among grape growers in Mbarara

Abstract

This report assesses the management of pests and diseases affecting grapevines (Vitis vinifera) among small-scale growers in Mbarara District, Western Uganda. The study focused on the growers affiliated with the Mbarara Grape Farmers’ Cooperative Society Limited. Amid Uganda’s reliance on grape imports and the region’s potential for viticulture as a poverty-reduction strategy, the study addresses knowledge gaps in pest and disease identification and management practices. Objectives were evaluating growers’ proficiency in identifying key threats and aligning their methods with established viticulture standards. Using a survey of 70 growers, using questionnaires, high-resolution images for identification testing, and field observations in a tropical climate zone, the research identifies prevalent fungal diseases such as powdery mildew (Erysiphe necator) and downy mildew (Plasmopara viticola), alongside pests including birds, grape berry moth and mealybugs. Results reveal strong recognition of common mildews (over 90% accuracy) but lower proficiency for fruit-specific diseases like botrytis, management relies predominantly on chemical controls and informal knowledge from peers, with variable adherence to integrated pest management (IPM) standards. In conclusion, highlight environmental factors driving fungal prevalence and recommend academic interventions for localized regional standards for viticulture production, enhanced extension services for safe pesticide use, and further research to improve sustainability and productivity in grape production in Uganda.