Is there a point when fungicides are no longer needed?

bart1(6/7 Northern VA)July 17, 2014

I'm growing apples, pears, peaches, and plums and some of the peaches and plums are getting close to being ripe.

Is there a point in the season when you no longer need to spray fungicides because the fruit is no longer susceptible? Here in nothern VA, the grapes themselves are no longer susceptible to mildews and rots around the fourth of July, but the leaves still are, so you still have to spray, but just the (upper) leaves not the (lower) fruit.

I was wondering if there was a similar situation for fruit?


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alan haigh

The nice thing about SI fungicides is they can be used for rescuing a crop when brown rot reveals itself to be a problem if you react quickly. This means you can experiment, which is helpful because species, varieties and sites all provide variations in pressure levels. Monterey Fungus Fighter is an SI that works well for BR.

I usually don't need to spray peaches (and plums) but once or twice with fungicide. Once is when I spray about 30 days before harvest and the fruit ripens without a problem. If some rot shows itself say 2 weeks after that spray then one more should do it. With some sites/varieties scab requires an earlier spray. I think MFF may not work so well against scab. Chlorathalinal does.

I don't worry about summer fungus of pears, because they aren't a problem here. I usually put up with them in apples as well as sooty blotch and flyspeck are the main ones here and they are cosmetic problems and sometimes storage problems only.

    Bookmark   July 17, 2014 at 5:22PM
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bart1(6/7 Northern VA)

Thanks HMan!

What are the SI fungicides? I used the google, but I couldn't find one.

    Bookmark   July 18, 2014 at 4:41PM
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alan haigh

Try sterol inhibiting fungicides.

    Bookmark   July 18, 2014 at 6:00PM
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