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I've been planting apple, pear, and crabapple trees for 4 years now and for bugs I use Sevin. But like Delphic said - you don't want to use Sevin until after the trees are done blooming. You don't want to kill the pollinators!! Sevin will also thin your fruit crop, but in the early years of tree growth, you don't want apples too early. Give the trees more energy to grow by hand-thinning or if you spray with Sevin, that'll thin the fruit. Energy spent to growing fruit will set back the tree's overall growth. Sevin will keep the Japs controlled.

Once your trees get bigger, Imidan is the insect control recommended by most apple growers. In March you can spray with dormant season oil to kill over-wintering insects and eggs laid the previous summer.
 
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