Abstract
Seven days after inoculation with Europhium clavigerum (Robinson and Davidson), lodgepole pine seedlings showed an external flow of oleoresin. On the sapwood surface, a white streak extended above and below the wound. The sapwood adjacent to the inoculation was gradually impregnated with resinous compounds, and the bark adhered to the sapwood around this zone of resin-soaking. After 21 days, callus tissue had developed around the margin of the resinous area, and 1 year later, the xylem and the phloem had begun to overgrow the resinous area.The terpenes identified in 60-day-old resinous response from both seedlings and mature trees were β-phellandrene, 3-carene, α-pinene, camphene, β-pinene, myrcene, limonene, and p-cymene. The phenolic substances present in each were pinosylvin, pinosylvin monomethylether, pinobanksin, and pinocembrin.
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