Yield reductions at current nominal thresholds of one to two DBM larvae per plant in canola may not be significant. Therefore, the nominal thresholds for DBM in canola may need to be increased to a slightly higher number of larvae per plant. Dynamic action thresholds incorporate the effect of natural enemies on pest control. “Identification...

Pollen beetles were susceptible to three of four insecticides tested. Yield reduction was detected at seven to nine beetles per plant, but not at four beetles per 10 sweeps. Pollen beetles were not detected in the Prairies and no native parasitoids were found attacking pollen beetle larvae in Atlantic Canada. “Generate knowledge and control strategies...

This project evaluated several crop and non-crop species commonly found in the Canadian Prairies as possible hosts for aster leafhopper development or phytoplasma infection or both. Alfalfa, sow thistle, stinkweed and dandelion were found to harbour aster yellows phytoplasma and are likely acting as reservoirs for the phytoplasma in Western Canada. “Investigating the role of...

Clubroot continues to spread, but improved monitoring and methodologies allow for more pathotype characterization to better identify, quantify and eventually manage clubroot-causing pathotypes going forward. “Canadian canola clubroot cluster pillar 4: Surveillance and pathotype monitoring” Stephen Strelkov, University of Alberta Alberta Canola To find the full report, go to the Canola Research Hub at canolaresearch.ca...

Although impact varied among species, predatory nematodes belonging to the Steinernema genus provided significant mortality of diamondback moth, lygus bug, cabbage root maggots and black cutworms. “Biocontrol potential of entomopathogenic nematodes (EPNs) against selected key insect pests of canola in Alberta” Shabeg Briar and Paul Tiege, Olds College Alberta Canola Crop losses and the economic...