Hazard is dependent on stand and site factors that are conducive to successful beetle attack. In general, the higher the hazard, the more damage will occur during an infestation. Bark beetles normally have four larval instars between egg hatch and pupation. Bark beetle larvae are white, legless grubs. Typical adult features begin to form.
Risk is dependent on the proximity of a beetle population to the stand in question.
The higher the risk, the more likely a stand will be attacked. This practice is not a beetle management tool, it does not reduce beetle populations or stand susceptibility. Sanitation harvesting is intended to remove currently infested trees where beetle life stages still remain under the bark. This is the most efficient form of beetle management. The objective is to reduce residual beetle populations available for subsequent attack within the stand or in adjacent susceptible stands.