A Tentative Classification of Jack Pine Susceptible to Bark Beetle Attack in Central Wisconsin
Abstract:Jack pine, Pinus banksiana Lamb., an important pulpwood species in central Wisconsin, requires periodic thinning in plantations and natural stands to relieve stagnation and to promote vigorous growth. Selection of trees for cutting that are susceptible during periodic outbreaks of Ips pini Say. and I. grandicollis Eichh. is proposed to reduce losses to these insects. Basis for the erection of the tree classification system was obtained from literature and field studies correlating host increment core moisture content with dominance, d.b.h., live crown ratio and radial crown fullness for bark beetle infested and non-infested trees. Five susceptibility classes were established employing the product of live crown ratio in percent and radial fullness expressed as a fraction as a crown index (CI). Bark beetle susceptible trees include those with crown indices CI = 25 (17 to 25); resistant trees possessed a CI of 38 (33 to 38) and 50. Small 2 to 3 inch or less diameter trees of CI 15 to 5 were resistant. Additional factors considered include injury to bole, drought, insect defoliation and disease.
Document Type: Journal Article
Affiliations: Associate Professor, Department of Entomology, University of Wisconsin, Madison
Publication date: 1964-08-01
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