Effect of intercropping bean with maize on bean common bacterial blight and rust diseases

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Abstract
The effect of intercropping bean with maize on bean common bacterial blight and rust was evaluated under three cropping systems: mixed intercropping, row intercropping, and sole cropping of bean using five bean cultivars in a randomized complete block design. Both mixed and row intercropping significantly decreased incidence and severity levels of both diseases compared with sole cropping (P < 0.05). In mixed intercropping, common bacterial blight incidence levels were reduced by an average of 23% and 5% compared with sole cropping and row intercropping, respectively. Similarly, mixed intercropping reduced rust incidence levels on average by 51 % and 25% relative to sole cropping and row intercropping, respectively. The cultivars also differed significantly in their susceptibility to both diseases (P < 0.05). Rust and common bacterial blight incidence assessed at three bean growth stages for each cultivar interact significantly with cropping systems (P < 0.05).