Williston Research Extension Center


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Increasing Levels of Root Rot Observed in Lentils in NW ND (07/14/16)

Analysis of root rot samples collected during field scouting (Adam Carlson, NDSU & Kim Zitnick, NDSU) has revealed increasing incidence and severity of root rot in lentils across northwest ND (Fig 1). Root rotting and wilt-causing Fusarium pathogens have been most commonly isolated. The frequency of Pythium has increased recently, whereas Aphanomyces euteiches has only been detected from one field. Rhizoctonia solani thus far has not been observed. Frequent rain and resulting high soil moisture is most likely responsible for the observed increase, in combination with the seed treatment fungicides no longer being effective at this point in the season.

Determination of the casual organism is important in the case of root rot as not all seed treatment fungicides are effective against all pathogens. There are currently no seed treatments available for control of Aphanomyces in peas and lentils. Rotating out of peas and lentils for 4-6 years can help reduce the buildup of these pathogens, although note that some root rotting pathogens can infect other broadleaf crops.


For more information about root rot diseases of pulses see the new Pea Disease Diagnostic Series (NDSU), as well a publication from Canadian pulse growing associations, “Root Rot in Pea and Lentil in Western Canada”.


Audrey Kalil

Plant Pathologist

NDSU Williston Research Extension Center

 Julie Pasche

Assistant Professor, NDSU Plant Pathology

 Kim Zitnick-Anderson

Post-Doctoral Researcher, NDSU Plant Pathology


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