Q.Apricot fruits fall off
We have a 5 year old apricot tree that fruited last year about 300 fruits. This year while still developing it had about 800 bloomed buds that all gave fruits but after two weeks just 85% of them fell off with no evidence of diseases or frost. After three weeks, all the remaining apricots that showed very slow growing became yellowish and fell off too. Now at the end of May there are no more fruits on branches. The tree looks healthy and leaves are dark green and fairly grown. Any hint?

This is a common issue and the link below will help you.
https://www.gardeningknowhow.com/edible/fruits/apricots/apricot-fruit-falling-off.htm