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Pulse Crop Update (07/19/18)

Ascochyta continues to be detected by NDSU pulse crop scouts.

Pulse Crop Update

Ascochyta continues to be detected by NDSU pulse crop scouts (WREC: Shawn Postovit, NCREC: Graysyn Kitts) in chickpea fields on stems, leaves and pods (Figure 1). Disease severity levels (percent of crop canopy within a positive field exhibiting Ascochyta symptoms) has stayed below 26% in all of the scouted fields and is as low as 2% in some cases. Fields with infected pods in particular will likely see yield and seed quality losses at higher disease severity levels, however.

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Risk for Ascochyta disease development is greatest following rainfall events, where moderate temperatures (68-77°F) correspond with 12 hours or more of leaf wetness.  Rain splash will spread spores from diseased to healthy tissue.  In the absence of rainfall events, 6-12 hours of high relative humidity will also allow for disease progression. Symptoms become visible 4-5 days post infection and structures that produce spores, which can lead to further infection, form 7-10 days post infection. As the chickpea crop matures, these factors should be considered when making fungicide spray decisions.

White mold and anthracnose are the primary foliar diseases of concern in lentil fields at present (Figure 2). The WREC pulse scout has found two fields in Williams County with anthracnose, and white mold has been identified in fields in Williams, Burke and McKenzie Counties. Symptoms characteristic of advanced stages of both diseases are shown in Figure 2.

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Both anthracnose and white mold are favored by high relative humidity in the crop canopy.  Anthracnose can develop at a wide range of temperatures but disease is most severe between 68 and 75°F. White mold development can occur at temperatures between 50 and 78°F and is generally favored by cooler temperatures. Foliar fungicides registered for use in lentil can differ dramatically in efficacy for the management of these diseases.  Fungicide efficacy data is available on the Plant Pathology page of the NDSU Carrington Research Extension Center: www.ag.ndsu.edu/CarringtonREC/plant-pathology-1

Audrey Kalil

Plant Pathologist

NDSU Williston Research Extension Center

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