What kind of vegetables and plants need foliar fertilizers

I recently heard about spraying fertilizers on leaves. I was wondering what kind vegetables and plants need fertilizer to be sprayed on their leaves? How often should fertilizer be applied to leaves? Can leaves absorb the nutrients like roots?…

Fruit Tree Spray

Have been using Wilson’s fruit tree spray-no longer available-what can be used as an alternative for apple & pear trees? Thanks, Hugh…