Alabama: Soybean Rust, Frogeye Leaf Spot Currently Active

    Soybean rust. Photo: Alabama Cooperative Extension

    Frogeye leaf spot is active in the state and can cause severe yield loss on susceptible varieties. Fortunately, many varieties planted in Alabama appear to have some level of resistance to frogeye. Hopefully farmers growing frogeye susceptible varieties applied a fungicide prior to the arrival the disease based on weather patterns that favored its development.

    Soybean rust has the potential to cause significant yield loss to late maturing soybeans this year. Soybeans at the mid R5 (5.5) growth stage or later are old enough to be safe from the risk of rust damage.

    However, soybeans with good yield potential, but at an earlier growth stage, that have NOT received a fungicide previously should be treated with a fungicide product with good efficacy against the disease. The potential for severe yield loss from soybean rust is higher than at any time since 2013.

    Taproot decline is popping up in soybean fields around Alabama. The disease is easy to spot in fields as infected plants will exhibit a yellow/interveinal flagging in the upper canopy; plants will wilt and die soon after.

    If you examine one of these symptomatic plants, you will usually note that a few plants in the same area are showing symptoms or are already dead from the pathogen. Infected plants will break off at the tap root when given a firm tug. Typically, the tap root and lateral root sections will be blackened due to the fungal infection.

    There are no fungicides labeled for taproot decline.




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