Question
My evergreen tree has bores how can I chemically treat them, or is there an organic way?  I opened up one of the conifers/ the end of the tree branch and I could actually see them, yuk!  I live in Rio Rancho, NM the soil is desert like sandy and like clay.

Answer
This sounds like tip moths. The adult moth lays its eggs on the tip bud of a branch and the egg hatches and the small larvae bores into the tip and down into the stem. It feeds there and completes it life cycle. The tip of the branch dies. The tree will put out a new leader causing the tree to bush out at the tip. I would treat the tree with an insecticide called Bayer Advanced Tree and Shrub Insect Control. This is applied to the spoil and the roots take it to the foliage and stems killing the feeding insects when the feed on the plant juices with the insecticide. The old dead tips can be cut off and then destroyed removing the insect in the twig. Sprays of insecticide can be used but they must be applied before the moth larvae enters the twig or the insecticide will not work. This timing is difficult to get right so the soil applied insecticide is best in this situation,. Here is a web link to more information on this product. Check with your local garden type or nursery for this product. http://www.bayeradvanced.com/insects-pests/products/12-month-tree-shrub-insect-c...