Fontanelle, IA | neukm - 9/15/2025 21:16
There's a guy from Kansas a few posts up who has experience with southern and disagrees with you.
Spraying fungicide a month before disease shows up in corn has not paid "here"
I’ll bet that KS has had southern rust before 2025, correct?
So, if you’ve experienced southern rust in previous years, then you’re probably paying attention to southern rust scores on hybrids?
And, the companies selling hybrids in your area are also paying attention to GENETIC southern rust resistance?
And, KS isn’t typically a 15-18 plus inches of rain over July either.
The environment of 2025 was so conducive to southern rust in a population of hybrids that have poor genetic resistance to southern rust that you needed to get the active in the plant early. And, most should have been treated 2x. Once you found rust, the rust was already blowing up in the lower canopy in mid 70-80 degree dew points at the exact worst time. Ignorant Application errors also….
Edit: and what I’m considering “early/ahead of disease” is 7 days 100% full tassel which in our case in 2025 would have been around 100% tassel time. 1 month “early” would have been v12 or a little more - around June 10-14 when most guys were spraying bean post….
Edited by Baby Robin 9/16/2025 09:03
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One fungicide pass was not enough
