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Compared with mono-cultures, beans grown in association with maize showed generally less incidence of the following diseases and pests: halo blight, bean common mosaic, anthracnose, common blight, scab, Phoma, mildew, bolworm and to a lesser extent angular leaf spot. For white mold and the black beetle Systates the opposite was observed. Rust and aphids were erratic in this respect.Apparently a kind of cultural control of the major bean diseases in Kenya is effected by growing beans in association with maize.

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