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nafex - Re: [NAFEX] Apple Curly Leaf ?

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  • From: Del Stubbs <northernlights2n@yahoo.com>
  • To: dmnorton@royaloakfarmorchard.com, North American Fruit Explorers <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] Apple Curly Leaf ?
  • Date: Fri, 13 Jul 2007 05:20:16 -0700 (PDT)

Thankyou everyone for the responses! I just ordered the 3 bookes recommended
from MSU by
Dennis.
I will get out my hand lens, take some close-up pics, and report back in a
few days.
Del

--- dmnorton@royaloakfarmorchard.com wrote:

> There is one thing for sure, it is either a pest or a disease! I have
> always said that
> fruit growing is a scientific art...or is it an artistic science?! With
> over 11,000
> trees now, I have seen just about everything you cna get with apple trees
> and peach
> trees. But I still have to pull out the reference books on a daily basis.
> As has been
> pointed out in several posts, both pests and disease can cause leaves to
> curl. If it's
> a pest, there may be no sign at all except the "honeydew" which can be seen
> if you move
> the leaf so the sun reflrcts off the top side of the leaf. It looks like
> very small
> drops of mineral oil. Disease is a little easier to identify in that there
> are usually
> visible signs such as in the powdery mildew photos from the links posted.
> There are 3
> very good books that I would recommend for both pests and disease if you
> are a grower,
> whether in your backyard or commercially.
>
> A Pocket Guide for Scouting Apples found at
> http://www.ipm.msu.edu/ApplePocket.htm
> A Pocket Guide for Scouting Stone Fruits found at
> http://www.ipm.msu.edu/Pubs_stone.htm
> Diseases of Tree Fruits in the East available at
> http://web2.msue.msu.edu/bulletins/keywordsearch.cfm
>
> I use these three references on a daily basis and highly recommend them.
>
> Dennis Norton
> Royal Oak Farm Orchard
> http://www.royaloakfarmorchard.com
> http://www.theorchardkeeper.blogspot.com
> http://www.revivalhymn.com
> ----- Original Message -----
> From: Joe Boles
> To: North American Fruit Explorers
> Sent: Wednesday, July 11, 2007 8:20 PM
> Subject: Re: [NAFEX] Apple Curly Leaf ?
>
>
> Have a look at these sites with pictures showing how powdery mildew curls
> up leaves.
> http://ohioline.osu.edu/hyg-fact/3000/3001.html
> http://utahpests.usu.edu/plantdiseases/images/uploads/Fruit/applepm2.jpg
> http://plant-disease.ippc.orst.edu/plant_images/ApplePMGroupShot.jpg
> http://www.gov.mb.ca/agriculture/crops/diseases/images/fac50s00j.jpg
> http://www.inra.fr/hyp3/images/6034461.jpg
>
>
> ----- Original Message -----
> From: dmnorton@royaloakfarmorchard.com
> To: North American Fruit Explorers
> Sent: Wednesday, July 11, 2007 8:05 PM
> Subject: Re: [NAFEX] Apple Curly Leaf ?
>
>
> Del.
>
> There are several pests that cause apple tree leaves to curl. RAA
> (Rosy
> Apple Aphid), PLH (Potato Leaf Hopper), and GAA (Green Apple Aphid)
> Looks
> like your is RAA (rosy apple aphid). Here's some info on RAA and the
> link
> to the MSU web page that has more in-depth info
> http://web1.msue.msu.edu/vanburen/fraa.htm .
> Rosy apple aphid feeding often causes apple leaves to curl, starting at
> petal fall. These leaves may later turn bright red. Feeding on the
> leaves
> around fruit clusters often results in the bunching, stunting and
> malformation of the developing fruit. These abnormalities become worse
> as
> fruit develops and can eventually render the fruit unsalable.
>
>
>
> Large aphid populations may produce large amounts of honeydew as waste
> from
> the sap on which they feed. Honeydew excreted onto fruit will serve as
> a
> growing ground for sooty mold fungus, which will affect the finish of
> the
> apple. Toxins in the aphids' saliva also serve as a "stop drop,"
> preventing
> the fruits' abscission (natural separation from the tree) at normal
> harvest.
>
>
>
> Hope this helps!
>
> Dennis Norton
> Royal Oak Farm Orchard
> http://www.royaloakfarmorchard.com
> http://www.theorchardkeeper.blogspot.com
> http://www.revivalhymn.com
> ----- Original Message -----
> From: "Del Stubbs" <northernlights2n@yahoo.com>
> To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
> Sent: Wednesday, July 11, 2007 8:49 AM
> Subject: [NAFEX] Apple Curly Leaf ?
>
>
> >
> > I notice this most years on some apples, but it seems much more
> pronounced
> > this year,
> > however this year 3/4 of my couple hundred apple trees (many
> varieties)
> > have it. I do not
> > see significant insect populations on affected stems, and the new
> leaves
> > have eventually
> > come out unaffected in previous years. In looking on various apple
> disease
> > websites I
> > have seen nothing like it, so I am asking for ideas of disease,
> insect,
> > virus,
> > deficiency, etc. ....names or ideas for me to look farther into.
> > It seems Nafex photo page site still cannot upload images, so I have
> > started one of
> > those free photo sites for my fruit related pics, hope it works...
> >
> >
> http://www.flickr.com/photos/48198726@N00/776767030/in/set-72157600761592815/
> >
> > thanks, Del Stubbs, northern Minnesota
> >
> > Del Stubbs http://www.pinewoodforge.com zone 3 N. MN
> > _______________________________________________
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Del Stubbs http://www.pinewoodforge.com zone 3 N. MN



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