The most important field pests of common beans is bean flies. There is interaction of bean fly with root rot and Fusarium wilt disease complex in soils with depleted nutrients causing yield loss. Alternative management strategies were evaluated in Kenya in regions with severe decline in soil fertility to optimize yields. There was variation in bean fly infestation and damage in the cultivars and fertilizer rates during different seasons and locations. Plant resistance and response to fertilizer were influenced by environmental conditions, location specific and season. Phosphorus fertilizer...