[NAFEX] Peach Disease - scab or bacterial spot

John Smith friendly27sw at yahoo.com
Thu Apr 27 17:48:28 EDT 2006


I think I may have experienced both the fungal scab
and bacterial spot on my peaches in the past.  Can
anyone tell me an easy way to tell the difference
between the two?  I swear I've seen pictures of both
that can look pretty much the same.

Central MO

--- Don Yellman <don.yellman at webformation.com> wrote:

> Dennis:
> 
> I have had both bacterial spot (which also visibly
> affects the leaves) and peach scab in past years,
> and managed to eliminate them with timely dormant
> sprays of Kocide.  Neither of these diseases
> resulted in blobs of pectin on the fruit, and the
> photo in your referenced link, which looks exactly
> like what I had,  shows none.
> 
> You may not have serious oriental fruit moth
> infestations in northern Illinois, but in the east
> and southeast we do.  While we have yet to hear from
> Shirley with perhaps a better description of the
> problem on her little peach fruits, and a more
> specific location than zone 7, she does live in the
> southeast somewhere, and that is where the OFM is
> most active.  In many southeastern orchards, the OFM
> will visit every peach on the tree if allowed to do
> so, leaving from 1 to 3 little blobs of pectin on
> the surface.  Such fruits will soon contain OFM
> larvae, which tunnel around near the pit and usually
> cause the fruit to drop prematurely.  Even OFM
> penetrations that do not result in larvae compromise
> the integrity of the skin, which causes brown rot
> later in the season.  When I spray for OFM early in
> the season, I also include a fungicide like Captan
> in the mix to prevent other early problems of
> peaches: small patches of powdery mildew and rusty
> spot.  When either of these is visib
> le on a peach at thinning time, that is one to take
> off.
> 
> The oriental fruit moth can also affect the twigs of
> trees when the larvae tunnel in, leaving swollen
> ends on small branches, and causing twig and even
> branch dieback.
> 
> The only things the OFM likes better than peaches
> are smooth-skinned stone fruits such as nectarines
> or pluots.  To grow such fruits in the southeast,
> you pretty much have to stand by the tree with a
> sprayer all season long, or bag the fruits after
> thinning.
> 
> Don Yellman, Great Falls, VA 
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