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Re:Crashing Tiger Scorched Dragon

No, I'm not sure - anthracnose is my best guess.  I've researched this extensively since I had the problem last year.  I have an Ash tree on the property that has anthracnose problems and it looks similar.  It's also the best visual match at a ag site that lists cucurbit diseases. http://aggie-horticulture.tamu.edu/cucurbit/   (good resource)

If anybody knows better, I'm open to any theories. This disease only hits new leaves as they start to grow rapidly.  It doesn't appear to affect mature leaves or very young one's (smaller than your hand).

A perfectly normal looking young leaf will develop soft blackened angular areas usually around the outer margins of the leaf.  This will happen in a matter of hours once the leaf starts to grow rapidly.   I see very little spotting in the centers of the leaf.  In a few days, the area will turn dry and tan colored and eventually fall out leaving a deformed leaf as the unaffected areas of the leaf continue to grow.

Daconil appears to control it.  However, once it starts, new leaves will continue to develop lesions for several days after treatment.  The picture above shows a moderately affected leaf.  A severely affected leaf ends up totally deformed with little surface area left.

If anyone has any ideas on what this may be, please let me know.  It scorched the hide of my Calai tiger pretty bad.

vince

--- Mr Bruiser <mrbruiser@cox.rr.com> wrote:
> Are you sure it was anthracnose?  I was under the
> impression that this
> disease appeared as spots on existing leaves, not as
> burning new
> growth, and that its infection of pumpkins/squash is
> rare.
>
> Bryan
>
> vince <anaid_tecuod@yahoo.com> wrote on 7/9/2001
> 12:37:48 AM:
> >
> >The last week has been slow torture as I watched my
> >prized tiger/dragon 846 Calai, crashing and burning  in
> >slow motion before my eyes - all of it from my stupidity.
> >
> >First it came down with a bad case of Anthracnose, a
> >fungal disease that attacks new leaves.  Each day for
> >the last week I've watched the next set of new leaves
> >on the vines wither, and burn. It's seriously affected
> >over a hundred leaves already.  I missed one cycle of
> >spraying on this plant because it had showed no signs
> >of problems and now I'm paying the price.  I amputated
> >three badly infected secondaries and cringed as the
> >tiger howled and the dragon roared.
 

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