I made a terrible mistake last weekend while home and sprayed dormant spray on my apple trees while they were showing signs of bud break. Some I could even see some of the pinkish flowers emerging. Within an hour I noticed the petals were wilting and so were some of the new leaves just popping out. As soon as I saw what was happening I realized my mistakes and immediatley got out the hose and gave them a good wash. Not sure if rinsing them off is going to help, but it was the best idea at the time.

Make sure your apple trees are not showing any signs of bud break. Another thing is I live a lot farther south than you, so your apple trees might not be showing signs of bud break. Good luck.

You will probably affect shoot growth somewhat but probably not enough to forsake dormant pruning, unless trees aren't bearing yet anyway. In that case you might want to go lighter than you might have if you pruned earlier, but it really won't make noticeable difference in either case.

I don't believe 10-10-10 to be your best option for apples. Cornell doesn't recommend annual applications of P at all. For bearing trees a maintenance recommendation would include much more K than N but for establishing you should probably lean more on N. You pull a lot of K from the soil with every apple.

You might consider a soil test accompanied with specific recommendations. It's certainly worth doing at least once.

Mostly people use horticultural oil these days or Sunspray ( I use Purespray) which is most affective for mites and scale from half inch green to tight cluster. Haven't seen that old Volck oil for some time.

Hman, the oil I have is horticultural oil, paraffin based, called Parafine. The label states "Preferably temps should be above 40 F. Dormant sprays are generally more effective in the spring, just before new growth starts."
I will prune as usual. I am expecting some to fruit this year as about 30% of them set fruit last year. I picked most off and left a few.

Thanks all.

Sure helps to read the label! One year I had a very large tree care company just butcher some 100 year old apple trees I was managing when they sprayed hort oil the morning of a very hard frost after trees had budded out. On some trees entire scaffolds were killed. I took over the spray contract at that point.