What I do if buds are ready to open and a freeze is coming. I take my small hand sprayer (1 1/2 gal) mix 1 qt (of the cheapest vegtable oil you can buy at the grocery store) and water to fill the sprayer. Spray your vines or fruit trees good while shaking the sprayer so the oil and water do not seperate. This will hold up bud break for about 2 weeks. Sprayed my pear and plum trees 2 days ago.