Postemergence weed control in loblolly, slash, longleaf, and eastern white pine nursery seedbeds

Abstract

Pine seedling tolerance to postemergence applications of herbicides was examined in field experiments conducted on loblolly (Pinustaeda L.), slash (Pinuselliottii Engelm. var. elliottii), longleaf (Pinuspalustris Mill.), and eastern white pine (Pinusstrobus L.) at eight southern forest nurseries in 1976 and at five nurseries in 1977. Herbicides suitable for postemergence use are (kilograms per hectare): bifenox, 2.2 and 4.5; acifluorfen, 0.3 and 0.6; oxyfluorfen, 0.3 and 0.6; oxadiazon, 2.2 and 4.4; napropamide, 1.7 and 3.4; butralin, 3.4 and 6.7. Seedling injury to some species was caused by chloramben at 4.5 and 9.0 kg/ha and prometryn at 1.1 and 2.2 kg/ha. Chlorosis was noted with 2.2 kg/ha of perfluidone.