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Re: [nafex] Ribes - Diseases

At 11:34 AM 7/4/00 -0400, you wrote:
>Hello All,
>I have a question regarding anthracnose, which I believe is referred to as
>"leaf spot" in currants.
>This spring I put in 5 red currants, 5 black currants, 2 jostaberry and a
>gooseberry.  The currants and josta were shipped dormant, except for 1 Red
>Lake, red currant, and one Pixwell gooseberry.  I have sprayed every 10-14
>days with a general purpose orchard spray, adding dormant oil, and lime
>sulfur at grwoing season rates.
>In the past couple of days I have noticed some leaves developing a brown
>discoloration (or a brown, dead spot), in the outer edges of the leaves.
>With it being such a wet season I don't know how much use my spray program
>has been.  You no sooner spray than it rains (and rains well) in a day or
>The plants all seem to be very vigorous, except for these brown spots,
>which are not wide spread at this point.
>Having no experience with ribes I am not sure what it is.  I will post a
>picture here; http://www.sentex.net/~tolenio/spot.gif  Give me some time
>to get the image uploaded.
>In my research I found that Ferbam is the only registered product for
>anthracnose in currants, but I cannot find it locally.  I do have wettable
>captan, and lime sulfur on hand, but want to know the best approach.
>These plants will not be fruiting this season, as they are brand new in
>their locations.
> --
>Thomas Olenio
>Ontario, Hardiness Zone 6a

Tom, In my opinion the damage you show is NOT leafspot, I think it may be
toxicity to some of your spray because of frequency and that the leaves may
have been wet at the time of spraying and causing the material to flow down
to the edge of the leaf and hang there. This meanes that there is a higher
concentration at that point. If the browned portions of the leaves were at
the lower position this is a probable explaination, if the leaves were
upright and the damage not at the lower portion of the leaf, it is not
likely that this is true.

Leaf spot most often starts somewhere on the interior of the leaf and

Ed Mashburn
Northumberland BerryWorks
707 Front Street
Northumberland, PA  17857
(570) 473-9910

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