[nafex] KDL for Frost Protection

Dan Nave nave1 at comcast.net
Sun Apr 8 21:35:54 EDT 2012

Here is an article about KDL, with some quotations from Bob Purvis.



On 4/8/2012 7:42 PM, Dan Nave wrote:
> The weather forecast for freezing temperatures this next week in the upper Midwest changes daily,
> but it seems that it will happen on Monday and Tuesday night.
> Because of the early spring and the early flowering and growth on many plants I want to avoid having
> the frost kill off all the flowers and juvenile fruit.  It seems that most of my plants have
> flowered or are flowering right now.  Apricots are pretty much done flowering, Nanking cherries have
> only a few blooms left, Plum is in mid bloom, Red and Black currants as well as Jostaberry are in
> mid bloom, Carmine Jewel Bush Cherry is starting to bloom, Shadbush Serviceberry is near end of
> bloom, and Regent Serviceberry is just ready to bloom.
>    Bob Purvis has noted in the Apricot Interest Group that KDL (Potassium Dextrose Lactose) is a
> potassium spray which is supposed to give up to 7 degrees of additional protection during a freeze.
> In spite of a very, very strange Indian woman who answered the phone at Agro-K in NE Minneapolis and
> didn't want to tell me what the company hours were because she wanted to leave early on Good Friday,
> I managed to get a gallon of KDL for $22 plus tax.  The expert there mentioned Bob Purvis and
> recommended that we use 3 ounces per gallon and adjust the pH by adding 3 ounces of household white
> vinegar.
> I had already gotten a Stanley brand 4 gallon Backpack Sprayer which is a little awkward to hoist
> around but once you get it on your back it is incredibly convenient and easy to use.  So, today I
> sprayed all the plants mentioned above with the KDL and will see how well everything comes through.
> Probably sprayed a bit heavier than I needed to, but...
> Dan
> Zone 4a 4b St. Paul, Minnesota
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