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Rust may
be a serious problem, especially for seed production, causing
up to 100% yield loss. Tan, dark brown or reddish brown lesions
occur on leaves of rust-affected plants. None of the commercial
cultivars are resistant to rust, but rust-tolerant breeding lines
have been selected at AVRDC. Fungicides such as mancozeb or triadimefon
at the rate of 2-kg a.i./ha are sprayed at 10-day intervals to
control rust in susceptible cultivars. |
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Downy mildew disease
commonly occurs during spring and autumn seasons but it does
not generally cause yield reduction. The symptoms are pale green
to light yellow spots on the surface of the leaf. These spots
later enlarge into pale to bright yellow lesions. The underside
of the leaf shows white powdery spores. To control downy mildew,
plant resistant cultivars. For susceptible cultivars, spray fungicides
such as mancozeb at the rate of 2-kg a.i./ha depending upon severity
of disease attack. |
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Bacterial pustule
can cause yield losses of up to 40% in vegetable soybean. Early
symptoms of this disease are small pale green lesions that become
watersoaked with bacterial ooze that dries to become white crust
on upper/lower leaf surfaces. The best way to control bacterial
pustule disease is by planting resistant varieties.
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