UMass tends to gear toward commercial orchards. I’ve found Penn State and Cornell extension services friendlier to backyard growers.
Anyway, I am in the camp of low spray, less chemicals when I can. So, I follow @scottfsmith’s low impact spray schedule. Low Impact Spray Schedule (old version) - #53 by scottfsmith.
Apricot is one of those stone fruit i.e. peaches, plum, apricots, cherry.
At dormant I spray copper (Kocide 3000), dormant oil and sticker (Nufilm 17). Once tree set fruit, you need to figure out what are insects in your area, Oriental Fruit moths, Plum curculio, coddling moths, stink bugs, etc. or all of them.
For apricots, I also have thrips, too, which are big pain as effective spray is done at bloom time, risking killing bees. I mostly spray Surround (kaolin clay). Sometimes, I bag those fruit so Surround cover the bags making fruit inside cleaner. Surround can be washed off but don’t mix Nufilm with Surround. It’s impossible to wash off.
I am not aiming to produce perfect fruit. I only spray chemicals if needed. I try to use Surround, and bagging when possible. This approach is time consuming and not 100% effective. It’s more effective to spray chemicals if you do not object to it.