Don’t spray anything on any of your fruit trees while they are in flower. Sprays can damage the viability of the pollen.
Once the petals have fallen you can apply seaweed,foliage feed or ordinary sprays.
Do not apply foliage feeds in the last two weeks or so of June unless you have a large crop that needs thinning.
This is because a nitrogen burst to the tree at that point can encourage a larger June drop than normal.
Once the June drop has ceased..... ( the name June drop can be a bit of a miss nameing as it often happens nowadays in early July)....you can apply these feeds as you want.