Q: We have twig girdler beetles in our post oak trees. We worked hard last year to keep these trees alive, and we don't want to lose them now. Will these pests hurt the trees? How do we get rid of ...

But winter tree identification is not just about twigs, it’s about looking in detail at tree shape, the branches, the bark and colour, and in some cases the smell, he adds.

An image of the devastating flames of the Oak Fire, which tore through parts of Mariposa County, has been named one of Time's Top 100 Photos of the Year.