Research on the Farm (ROTF)

Flax Fungicide Treatment

Trial Information

The purpose of this project is to quantify the impact of a fungicide treatment for pasmo on Flax

• The grower will plant a Flax variety.
• The grower will manage their crop as per their normal best management practices.
• The grower will apply 1-2 fungicides for pasmo to 4 strips, alternating the strips. Untreated strips will also be included.
• Strips should be full length of the field (minimum 1000 ft.) and width to allow for a full “pure” pass with combine header.
• 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.

Results

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.