. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. tools, the resource manager can estimate tree and volume losses per year and how long an infestation will last on different habitat types. The most satisfactory long-term solution to the MPB problem is preventive management based on manipulation of tree and stand conditions to reduce vulnerability to beetle infestation. This is true because little can be done to reverse the trend of an MPB outbreak once underway. Silvicultural guidelines now
. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. tools, the resource manager can estimate tree and volume losses per year and how long an infestation will last on different habitat types. The most satisfactory long-term solution to the MPB problem is preventive management based on manipulation of tree and stand conditions to reduce vulnerability to beetle infestation. This is true because little can be done to reverse the trend of an MPB outbreak once underway. Silvicultural guidelines now available provide the most efficient and environmentally suitable tools for achieving such a long-term solution. The work that remains is to increase our understanding of beetle dynamics 44 when populations are at endemic (low) levels. This research is well underway and will contribute significantly to understanding the process of transition from endemic to epidemic populations. Data already in suggest that the MPB is a "follower" during endemic periods: it prefers lodgepole pines already infected by root rot or secondary bark beetles. This change of MPB from "leader" during epidemics, where it initiates the attack, to "follower" during endemic periods, where it follows on the heels of other pest invasions, appears to be a reflection of changes in beetle genetics. Once we have a better grip on MPB dynamics at low levels, we should be able to formulate sound preventive strategies to curb losses by this major forest pest. On the Wasatch National Forest, scientists are using traps baited with pheromones and kairomones to study beetle population numbers after thinning. They are also measuring the microclimate in unthinned lodgepole stands to determine its effect on the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations ma
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