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nafex - Re: [NAFEX] Apple Curly Leaf ?

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  • From: <dmnorton@royaloakfarmorchard.com>
  • To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] Apple Curly Leaf ?
  • Date: Wed, 11 Jul 2007 19:05:24 -0500

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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