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nafex - Re: [NAFEX] chemical thinning question

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  • From: "Ed Fackler" <ed.fackler@gmail.com>
  • To: "North American Fruit Explorers" <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] chemical thinning question
  • Date: Thu, 7 Jun 2007 08:09:40 -0400

Steve:

     The 1st sign of success is by cutting apples in 1/2 or through the newly developing seed cavity (which in years of good pollination they should be full) and if seeds are beginning to shrink, you've got some activity from the thinning agent.  In roughly 10-12 days thereafter stems will begin to yellow near the spur downward toward the fruit.

     I should tell you that in years of good pollination (4-6 hrs of sun with lots of bee activity will do it anytime during the bloom period) waiting until apples are 10mm is too late to do the desired amount of thinning.  Or one should apply thinners at 4-6 days post petal fall or when apples approach 6 mm.

     Hope this helps.

Ed, S. Indiana....near heaven...doing okay-fine.


On 6/7/07, sjkeipert@highstream.net <sjkeipert@highstream.net> wrote:

Some of my apple trees that have a tendency to be bienial bearers are getting to
the size where hand thinning is a pain. This year I tried thinning with a spray
of 10 ppm NAA along with a spreader/sticker to improve wetout. I sprayed about
12-14 days after petal drop, so its been about 3 weeks now. So far I have not
noticed any difference in drop, just the usual loosening of stem connections in
the undersized apples. Having never done this before, what should I be looking
for? When should I expect thinning, at the normal June drop? Any advice would
be appreciated. - Steve


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