Abstract
Field tests for control of Limonius canus LeConte in potatoes were conducted in eastern Washington during 1964–1967. Fumigation of soil in autumn with ethylene dihromide, 3 gallons of 83% solution per acre; Telone® (mixed dichloropropenes), 20 gal/acre; or dichloropropane-dichloropropene mixture, 25 gal/acre, gave excellent control. The following broadcast treatments, applied as granular formulations (5-14.3% active ingredient), gave similar results: 2 lb per acre of Dyfonate®( O -ethyl S -phenyl ethylphosphonodithioate), 3–4 lb/acre of diazinon Shell or parathion, and 4 lb/acre of carbofuran or Bay 37289 (O -ethyl 0-2,4,5-trichlorophenyl ethylphosphonothioate). In 1967, treatments of 5 lb/acre of Bay 37289 in an emulsifiable formulation were superior to all other broadcast treatments except Dyfonate. Broadcast treatments tended to be more effective and less variable than band or sidedress treatments with the same chemicals. These latter treatments with 2–3.3 lb/acre of granular phorate gave good control but were phytotoxic in 2 tests. A band treatment with 4 lb/acre of granular disulfoton and SD 8530 (3,4,5-trimethylphenyl methylcarbamate) broadcast treatments with up to 6 lb/acre of granular Shell SD 8530 (3,4,5-trimethylphenyl methylcarbamate) were inferior to other treatments.
Published Version
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