....
Since you've never had a problem before, I expect that there was an
unusually high amount of inoculum last year, and the two final sprays
of captan, then Scala, didn't do much to control it. Another
explanation might be that in previous years, you've used an EBDC
(Polyram, Dithane, Maneb, etc.) through the entire scab season, which
would have handled rust. The SI (Nova) would provide good post-
infection activity against rust as well as scab, so I doubt the
infections happened early.
Indeed, we used to rely on the EBDC more until a label change for longer
PHI. For that matter, SI also, but to fear of resistance. For many years
we'd have four polyram/nova sprays.
OK, Nova is out. (we only use Nova when we get caught needing post
infection) Polyram is out for the late period. Captan and Scala are poor
choices - what's left?
Karl
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