Blue Atlas Cedar only have a few insects that cause any real cause to worry. Bag-worms are probably the worst pest, on small trees Bag-worms can be picked by hand but larger trees need to be sprayed. Scale is another insect that attacks Cedars, they look like little crusty flakes covering the needles and branches. Scale feed on sap causing a chlorosis (yellow) look to the needles. The most difficult insect to control on Blue Atlas Cedar is Spider Mites. These are very small insects that can be seen with a magnifying glass. Feeding on the sap causes needles to turn yellow and later brown. Spidermites have become resistant to most of the old chemicals. We recommend using only true miticides for control.