Resin flow as a function of height along the bole of loblolly pine

Abstract

Resin flow was measured at four heights along the bole of loblolly pine, Pinus taeda L., using two, four, and eight wounds per height in May, June, July, and August of 1990. Consistent differences in resin flow between heights were observed with the eight per height treatment. The greatest amount of flow was found to be from the midbole and below. The differences in flow for the two and four samples per height treatments followed the same pattern as the eight per height treatment; however, no statistical differences were detected. Total flow for the entire tree was found to increase from May to August. Key words: oleoresin secretory system, Pinus taeda, southern pine beetle, insect – host interaction, induced response.