The apples on my apple tree are starting to form, so it is time for them to wear socks. Not because it is cold, but because the socks keep the apple maggot flies off the apple so you get nice clean apples later in the year.
I use “foot socks”, those small stretchy socks that you use to cover your bare feet when trying on sandals in a shoe store. We sell them at Bainbridge Gardens in boxes of 100. They fit now and stretch as the apple grows.
Another thing to do to try to control apple maggots is to use tanglefoot on a fake apple. The maggot fly will try to land on the fake apple and get stuck.
To get the maggot flies to come find the tree, you can hang a container of pheromones from the tree.
I don’t cover every apple, just the ones I can reach, and when there is a cluster, I try to only cover the strongest one as the weaker ones will usually fall off early before ripening. Nature does some thinning for me.