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    Author(s): A.C. Mangini; L.R. Barber; R.S. Cameron; G.L. DeBarr; G.R. Hodge; J.B. Jett; W.L. Lowe; J.L. McConnell; J. Nord; J.W. Taylor
    Date: 1998
    Source: Southern Journal of Applied Forestry, Vol. 22, No. 2, May 1998
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (371 KB)


    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.

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    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

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