I just noticed today that some of the pine trees in my yard have needles that are starting to turn brown and dry up. It just seems to be odd branches here and there. The trees are about five feet high and bushy. I'm not sure how old they are but they looked healthy enough up until now.

Having no experience of growing these trees before, I don't know what it is that's caused it nor what to do, if anything. Any suggestions as to what it could be and how to resolve it please?