Abstract
Ultra-low-volume (ULV) and concentrate insecticidal sprays were applied by aircraft to plantation Scotch pine, Pinus sylvestris L., to control larvae of Neodiprion sertifer Geoffroy. Complete control was achieved with malathion 95% ULV at 10 and 16 fluid ounces (fl oz) per acre, oxydemetonmethyl 4 pounds per gallon concentrate at 12 and 16 fl oz per acre, and Dursban ( O,O -diethyl O -3,5,6-trichloro-2-pyridyl phosphorothioate) 4 pounds per gallon concentrate at 16 fl oz per acre. Malathion 95% ULV and Baygon® ( o -isopropoxyphenyl methylcarbamate) 2 pounds per gallon concentrate at 8 fl oz per acre gave satisfactory control. It is believed that this is the minimum dosage required to control completely the larvae on plantation pine. The 1½ fl oz per acre application of Baygon 4 pounds per gallon concentrate controlled larvae in the tops of trees but did not affect those on the lower portions of the trees. Poor control was attributed to the insufficient amount of chemical applied.
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