By Scott Hartley, PAg, Manager, Crop Protection Laboratory, Regina
The Crop Protection Lab has received a total of 151 samples for diagnosis, including several requests for weed and insect identifications.
The majority of samples submitted (32) were diagnosed as herbicide injury combined with, in some cases, other factors such as environmental stress. Reasons for herbicide damage included carryover from 2017 and spray tank contamination, and involved Groups 2, 3, 4, 5 and 27. In the past two weeks, Group 2 damage has been more notable.
Environmental stress, most often due to moisture stress, accounted for 18 of the samples. With more adequate precipitation than earlier in the spring, many of the crops should recover. Several coniferous tree samples submitted have shown environmental stress related to conditions in previous years rather than in 2018.
Root rot complex, primarily in lentil and pea, accounted for 27 of the samples received. Seven of the root rot submissions were associated with Fusarium species.
Dutch Elm Disease submissions have also been steady, with 105 tree samples received as of July 16.