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Abstract
A southwide efficiency test of reduced rates of azinphosmethyl (Guthion®) for control of seed and cone insects in loblolly pine seed orchards was conducted in 1992. In each of nine loblolly pine (
Pinus taeda L.) seed orchards, an untreated (no protection) check and two of five possible rates of Guthion® (1.0, 1.5, 2.0, 2.5, or 3.0 lb ai/ac/application) were randomly assigned to three test plots. Insecticide treatments improved first-year conelet survival, second-year cone survival, sound seeds per cone, and sound seeds per conelet at nearly every rate. There was no trend of better protection with increasing rates of Guthion®. The 1.0 lb ai/ac rate was as efficacious as the EPA-registered maximum aerial rate of 3.0 lb ai/ac. Based on these results, orchard managers should consider reduced rates of Guthion® for operational cone and seed insect control programs.
Citation
Mangini, A.C.; Barber, L.R.; Cameron, R.S.; DeBarr, G.L.; Hodge, G.R.; Jett, J.B.; Lowe, W.L.; McConnell, J.L.; Nord, J.; Taylor, J.W. 1998. A Southwide Rate Test of Azinphosmethyl (Guthion®) for Cone and Seed Insect Control In Loblolly Pine Seed Orchards. Southern Journal of Applied Forestry, Vol. 22, No. 2, May 1998
