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Pine tree turning yellowish to redish up to tree crown

Signs and Symptoms of Mountain pine beetle attack

• Popcorn-shaped masses of
  resin, called "pitch tubes," on the trunk where beetle tunneling
  begins. Pitch tubes may be brown, pink or white in color.
  
  


• Boring dust
  in bark crevices and on the ground immediately adjacent to the tree base.


• Evidence of
  woodpecker feeding on trunk. Patches of bark are removed and bark flakes
  lie on ground or snow below tree.


• Foliage turning yellowish
  to reddish throughout the entire tree crown. Usually occurs either to
  ten months after a successful pine beetle attack.


• Presence of live beetles
  (eggs, larvae, pupae, and/or adults) as well as galleries under the bark.
  This is the most certain indicator of infestation. A hatchet for removal
  of bark is needed to check trees correctly.


• Blue stained sapwood.
  Check at more than one point around the tree's circumference.
  
  

URL: http://www.lamtree.com/pine_beetles.htm

OTHER FAQS:
The following is an excerpt concerning question on Spruce tree problem:

I have a row of spruce trees, and many of the branches are losing their needles and dying. What's wrong with my trees? How can I stop it from spreading to my other trees?
Questions to ask: What branches are dying (top or bottom)? Which needles are dying (old or new/inner or outer)? How many branches are affected? What type of spruce is it?

If trees are Colorado blue spruce and inner needles on lower branches are dying first, while outer, new growth is green, the problem is most likely rhizosphaera needle cast. Cultural control includes increasing air flow by pruning lower infected branches and increasing tree vigor by watering, fertilizing and mulching properly. A fungicide (chlorothalonil, Daconil 2787) can be used as a preventive measure. Make first application at bud break, the second a week later, and a third three weeks later. For most trees, especially large ones, contact a professional tree care company to apply fungicide. (Dial U Brief: Rhizospaera Needle Cast, 1988.)

If the tree is a Colorado blue spruce, and outer and inner needles on lower branches are dying first, the problem is most likely cytospora canker. There may be resin or sap exuding out of the branch near cankered areas. Use same cultural control as above. No chemical control is available for cytospora canker. (Dial U Brief: Cytospora Canker of Spruce, 1989.)

Be sure to diagnose these diseases properly and do not mistake them for abiotic problems like winter injury. Note these two diseases occur on other species of spruce, but are most common on older Colorado blue spruce.
url: http://www.mg.umn.edu/FAQ/trees.htm#Q6