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Controlling Ascochyta Blight in Pulse Crops

August 20, 2021
ascochyta blight attacks crop

Field peas with Ascochyta blight damage

Commonly grown pulse crops are susceptible to destructive foliar disease like Ascochyta blight, a fungus that can be very damaging to crops if left untreated. Entire growing seasons can be threatened if crops are left untreated, so it’s imperative to plan ahead to protect crops against this and other foliar diseases in future growing seasons.

Ascochyta blight is caused by Ascochyta rabiei, a fungal pathogen that can be seed-borne and occur on infested crop residues. For Ascochyta infections to develop, it needs a combination of moisture and temperatures ranging from 41-86°F. Once the disease is established on 1 plant, it can spread from plant to plant by splashing water and windy conditions. Spores spread the quickest in cool, wet conditions.

Ascochyta may not become visible until 4-5 days after infection. As the disease progresses, lesions will appear on the leaves and stem which can lead to stem girdling. If left untreated, the disease can penetrate pods and infect seeds, reducing marketability and quality as a food item.

It is important to treat Ascochyta blight as it has been known to wipe out entire yields and affect yield quality. Foliar fungicide management requirements vary by variety of the crop and weather conditions.

  • Chickpeas: Using Miravis® Top fungicide can help prevent foliar diseases such as Ascochyta blight in chickpeas. Applications should be proactive and made prior to disease development.
  • Dry field peas: Miravis Top on dry field peas provides protection against numerous yield-robbing foliar diseases including Ascochyta blight. Miravis Top also targets other diseases like white mold, alternaria blight, rust and powdery mildew. The first application of Miravis Top should be at R2 or full bloom.

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All photos and videos are either the property of Syngenta or are used with permission.

Product performance assumes disease presence. Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates commonly recommended in the marketplace.