Carbofuran trials in a red pine seed orchard.
Granular and liquid formulations of carbofuran (0.8 oz/inch tree diam.) were applied to red pine trees [Pinus resinosa] in a seed orchard near Avoca, Wisconsin, in May 1984. The proportion of cones attacked by insects, assessed in Sep. 1984, was reduced from 96% in untreated trees to 32 and 11% in trees treated with granular and liquid formulations, respectively. Insects controlled included Cydia toreuta, Eucosma monitorana and Dioryctria disclusa. Attacks by Asynapta hopkinsi were slightly more common on trees treated with carbofuran than on untreated trees. Yield of sound seed was much less on untreated than on treated plots. Some phytotoxicity was seen on treated trees, especially with the liquid formulation. The granular formulation of carbofuran has now been registered for use in northern seed orchards.