Double Application of Paraquat for Production of Lightwood with High Oleoresin Content

Slash pines were treated with two applications of 2 percent paraquat zero, 6, or 12 months apart in an attempt to produce 15 percent rosin content on a green weight basis in the basal 3m of the tree bole over a 2-year period. Application methods were pressure injector, tree injector, and bark streak. Half of the trees were sprayed with a 2 percent water emulsion of the insecticide protection. Insects caused high mortality in most treatments. Delay of half of the paraquat treatment for 6 or 12 months and insecticide application reduced the beetle attacks and tree mortality. Tree mortality was greatest for tree injector applications of paraquat to trees not protected by insecticide spray. No treatments achieved the original goal but the bark streak treatments with insecticide application approached 15 percent rosin (resin acid) content on a dry basis in the basal 1.5m with very low mortality. Turpentine content was highly correlated (r=0.97) with resin acid content.

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