A very early spray of Immunox (myclobutanil) will likely do the trick- it does for me. I apply it about 2 to 3 weeks after apple trees in area have dropped their flower petals- usually late May- early June. It's never failed me at the several sites I use it, even for susceptible seedless varieties.

Agreed - that Bonide spray has nothing in it that will help with black rot.

Scott

Is it easy to get Immunox, is there a brand at big box or another brand from Garden Centers. SHould I spray it every other week, and will it work on peaches and grapes, and how about for tomato blight

You only need to spray once in my experience to control bunch rot or whatever rot we tend to get here on grapes in the northeast (not an important crop to me although managing them is a small part of my job).

I don't think it will work for tomatoes- chlorathalinal is the stuff for them although it is considered a more dangerous compound.

Montery Fungus Fighter is better than myclobutanil for brown rot on peaches- I forget the actual name of the compound that's in it- same stuff as Orbit. Chlorathalinal is good for peach scab.

For peaches I'd recommend a chlor spray about 6 weeks before expected harvest and then MFF 2 weeks later if the label lets you use chlor that close to harvest.

Propiconazole aka Orbit aka Montery fungii fighter is good for brown rot on peaches and a spray before harvest should do the trick.

Unfortunately, chlorothalonil is not labeled for use on peaches after shuck-split.