Host Lyndsey Smith is tackling gibberella and tar spot management in this episode of The Agronomists, with guests Ken Currah of BASF and Greg Stopps of Corteva.
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- Isolated pockets of really good territory in Ken Currah’s territory
- Seeing a lot of dry crop in Greg Stopp’s territory. It’s quite dry. Seeing some leftover compaction issues from last year.
- If the crop is variable, how do we time it?
- Where things are extremely stressed, we should count our losses
- You have to understand what you are targeting, too
- Western bean cutworm is the first step in introducing the pathogen into the corn crop
- The numbers look pretty high this year — especially in the pockets that are usually heavy. This year the drought makes the conditions favourable to seeing lots of egg masses
- Why does western bean cutworm mean so much for the infection?
- It starts with silk channel infection. The western bean cutworm spreads it
- Use an integrated pest management (IPM) approach when it comes to scouting for the egg masses
- The late silks getting attacked in a dry year — that’s really where the issues are
- If we have no breeze going through the corn crop — that’s problematic, too
- Don’t forget to lean on your local agronomist
- Conditions in the canopy — are narrow rows increasing infection risk?
- Tar spot, however, does not like drought
- Ontario has not had the environment this year that is conducive to tar spot…yet
- It is time to prioritize scouting for tar spot
- Typically we see it mid-late August, where you wouldn’t quite expect to see corn turned as much yet
- Are there genetic markers that can help us see the signs of tar spot? Not that is common knowledge yet, as it is a relatively newer disease. The way we will manage it is through genetics
- Check out the full video for some interesting photos on tar spot side-by-side comparisons
- Tar spot can move in later — are we ever looking at a second fungicide application? If so, when should we be timing it? In Ontario, we don’t really have that information, yet
- You should not be doing two passes, unless your IPM program says so
- Please pay attention to pre-harvest intervals when it comes to a late-season pass!
- There’s tools to manage this…and it’s a whole IPM toolbox. Use that toolbox.