In Idaho these caterpillars like to feed on spruce and subalpine firs. In spring they first feed on vegetative buds and then on new needles and shoots. They are characterized by having a pinkish brown color with rows of white spots along the sides. These small caterpillars attack many conifers in Idaho landscapes. The larvae first feed in the base of the needles and then bore into the center of new shoots.
Mined needles turn red and drop off.
Damage by tip moth Trees damaged by tip or shoot moths can take on a reddish hue as the tips are killed. Look for yellow needles near tips of twigs and pitch around new bud clusters for signs of early infestation. These leafrollers are generally early season pests but can persist through the summer. Leaves tied together by leafroller Oftentimes after feeding is complete, the caterpillars will pupate inside the rolled up leaves. Painted lady butterfly larva Caterpillars of the painted lady butterfly belong to the thistle caterpillar group.