The province’s extensive network of bertha army worm traps isn’t sounding any alarm bells yet, but producers should keep watch, says insect management specialist Scott Meers. Results from the traps are posted on the Alberta Agriculture website.
If the cumulative count reaches 300 moths, Meers strongly recommends scouting starting in late July and progress through early August. Traps indicate the general risk in an area, but not the risk in an individual field, he said.
“For that reason, we do not encourage the use of traps to determine the risk field by field. We have had situations where the traps were high and there were high levels of larvae in the area but the trap field was not badly infested,” said Meers.