Evaluation of new products to reduce impacts of aphanomyces root rot of field pea

Small plot trials with lime application in the fall were initiated at Scott, SK, Redvers, SK, and Lacombe, AB and a spring application occurred at Scott, Redvers, Swift Current, SK, Taber, AB and Lacombe. Peas were planted into the plots with fall- and spring-applied products in 2022. None of the products tested in the field trials reduced Aphanomyces root rot severity. Root rot levels were high at all locations due to extensive rainfall in mid-June. Lacombe and Redvers were unable to harvest the lime trials. There was no yield increase at Taber and Scott. At Swift Current, there was a significant increase in yield in the plots with both lime products, but the biggest yield increase was observed in the plots that were treated with gypsum at all rates. A number of chemical, biological, and other treatment options were also evaluated in field trials at these five locations. None of the treatments reduced disease severity or improved yield. At the Taber site, yield was increased in one treatment at all product rates. There were no deviations from the original methodology except that lime was not applied in fall 2022 at the Lacombe site due to time constraints experienced from very wet soils.