Your fertilising programme needs to continue while you keep an eye out on the weather, as you must not fertilise if the soil is bone dry. Water first so that the soil is wet otherwise you could burn the roots. Heavy rain can also wash all the fertilisers out of the soil.
Pines will need far less fertiliser now than deciduous varieties, while fruiting trees require high in phosphorous fertilisers. Pines and Azaleas like a feed of Sequestrene. Soils will dry out in strong sun and even more so with strong warm winds, so you will need to water accordingly. If you have willow trees is an ideal time to set these in a tray that will hold shallow water as they do not like to dry out.
Keep turning you trees to obtain an even growth while continuing to spread for red spider mite and aphids etc. Inspect any leaves that may be stuck together as this could mean young caterpillars and damage can be done.
It’s also time to a watchful eye on any wiring as your trees will now building wood that is full of growth and could cut into the branches leading to scaring. Scars. Reduction in growing activity will mean pinching out of leaves will reduce to none depending on what variety of trees you have.