Research on the Farm (ROTF)

Background Information

• Pasmo is the most influential disease of flax. It can begin as early as the vegetative stages, but more commonly occurs during seed fill.
• Losses are most often a result of early-onset and disrupt seed fill. Infections occurring after seed filling is complete do not affect yield, but losses can still occur due to weakened bolls.
• Application of fungicide was done at stage 8.

Summary

Fungicides registered in Manitoba for pasmo in flax are Acapela, Dyax, pyraclostrobin products (Headline/Preach/ Raclos only), and Priaxor (while available).
There is no statistically significant yield improvement in any of the treatments at each site. The one site year that does have data that can be viewed with statistical influence is 2025-FF03, which was planted about two weeks after the other sites in 2025. At this one site, harvest moisture of the grain is greater in the fungicide treatment than the untreated check by 1.4 per cent, which is a factor we tend to accept with fungicide applications in many crops.