Identification and assessment of the role of natural enemies in pest suppression in canola with specific reference to diamondback moth management

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Purpose

Objectives are (1) to monitor natural enemies associated with diamondback moth (DBM) in canola, with a focus on larval parasitoid, (2) understand relationships between DBM and its natural enemies and to develop dynamic action thresholds and (3) understand factors to enhance foraging and parasitism of parasitoids associated with DBM.

Progress

Commercial fields of canola in southern Alberta were surveyed in 2020, but high rainfall resulted in low DBM populations and overall low infestation levels. A similar survey will be conducted in the summer of 2021. Laboratory studies were conducted to determine functional response of predator insects. Field cage and laboratory studies were continued in 2020 to calculate economic thresholds of DBM in canola fields.