The reason why the fruit may be dropping is due to those worms! More than likely Oriental fruit moths, or Plum Curculios. DO the fallen fruit have a small spot on them or burrows in them? You need to clean up ALL fallen fruit under the tree, or the cycle will start again! Once the worm ridden fruit falls, it hatches and start all over again. Get rid of the fallen fruit,best by throwing them in the garbage collection away from the tree. In the Late winter before the tree leaves, and blooms out, spray it with Dormant oil Spray. At bud swell spray it with a fruit tree spray such as Bonide fruit tree spray. Follow the spray schedule listed on the bottle. Spraying is essential to have good fruit. Prune the tree in late winter before it buds out prune out crossing branches, and prune to an open center/vase to allow light to penetrate. Also Apricots are like peaches and nectarines, in that they only bear on 1 year old wood, meaning that the branches that grow this year, will be the ones that will bear fruit next year. Its a good idea to prune out old wood, but keep a good structure for new branches to grow off of.

Bud swell is what happens, before the tree leafs, or blossoms out in Late Winter/Early Spring. You will see "bumps" on the branches, which indictates the tree is close to blooming, and leafing out. Those bumps are where the buds and flowers are. You can tell new branches, there generally green looking, old branches are woody and hard. You do need some woody branches, those will be the supports for the green branches that will grow, and produce fruit.You want to use the woody bracnhes as "Scaffolds" DO not spray when the tree blossoms, as you dont want to kill bees, or other pollinators. Once the bloosoms fall, usally is time for another application. Take a look at a Fruit Tree Spray made by Bonide. Its very common in most nurserys, and is an all in one spray. It treats for both diseases, and insects. It is not recommended for Pear trees though. get yourself a pump up sprayer, and follow the mix directions on the bottle. If the tree is 20 feet, you will need a ladder!

Only thing you need to do in Fall, is rake up the fallen leaves, and pick up any fallen fruit that may still be laying around. Also make sure your mulch is still good- keep the mulch a few inches from the trunk you dont want it touching, as usually rodents like burrow into it, and chew on the trunks.Dont not use the fallen leaves from that tree as mulch (or any fruit tree)- get rid of it too, as again it can start a disease cycle. Good sanitation is a must for fruit trees. Ideally burn the leaves or let the garbage pick up collect it. Do your pruning, and dormant oil spray in late winter. Ideally you can prune, and spray it the same day!