In the meditarainean according to many experienced farmers trees are painted white at the bottom to stop insects where or how can this formula be found here in North America?

Answer 1

this is usually white latex exterior enamel, common at paint store

Answer 2

In North America, you can find white tree paint at most garden centers or agricultural supply stores. It is commonly sold as "tree trunk paint" or "whitewash" and is used for the same purpose as in the Mediterranean - to protect trees from insects and sun damage. Alternatively, you can make your own whitewash by mixing equal parts white latex paint and water.