It may also be the time of year in relation to the sap running, etc.
I know where we live, we have a 2-4 week window for spraying for twig
borers on the pinon trees.  Maybe if those spraying could keep track of
when they spray in relation to what the tree is doing and let us know.
Just some thoughts.

[email protected] wrote:
> 
> Joy- I used 1 ounce of my Cs which is about 10 PPM in 1 gallon of water.  I
> didn't use a detergent but that sounds like a great idea to spread the spray.
>  I sprayed the tree 3 times this summer.  My instructions for pruning say to
> get rid of dead limbs.  My first spray was using an old 409 bottle as a
> sprayer.  After seeing the results I sprayed all 9 of my cherry trees.  Three
> of the 9 trees showed an improvement, but not as dramatic as the first tree
> sprayed.
> 
> The spray also worked great on my Italian prune tree.  Very little brown rot
> on the fruit.  They still had a fly larva in the fruit.
> 
> Brickey
> 
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