Larch Casebearer and Other Factors Involved with Deterioration of Western Larch Stands in Northern Idaho

摘要

In northern Idaho, dead and dying trees were found in western larch stands defoliated severely by larch casebearer during periods ranging from 4 to 10 years. Annual radial growth has decreased to 0.1 mm. in many trees. Examinations determined the extent that larch casebearer and other factors contributed to the deterioration. Of the 72 trees sampled, beetles were found in 11. Results clearly implied that larch casebearer is definitely responsible for weakening and predisposing western larch stands to mortality. (Author)