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acid acre applied areas average bales beds Bogalusa bordeaux mixture brown spot burning cankers carbon disulfide cause cones cost culling cutworms damage damping-off dewinged disease drought effective estry feet fertilizer foliage Forest Expt Forestry fusiform rust gallons germination germination tests green manure grubs hardwoods height growth illus inches increase infection initial survival injury Jour kill kiln larvae less lifting lings loblolly pine longleaf pine longleaf seedlings ment mixture moist mole crickets mycorrhizae nursery soil nursery stock nutrient peat percent percentage pine plantations pine seedlings plantable plantations planter pounds pruning reduce require samples sand seed lots seedbed shortleaf pine slash pine South southern pine nursery southern pine region southern pine seed sowing spacing species spray stands storage subsamples sulfate surface temperature thinning tion total number trays treatment trees U. S. Dept U. S. Forest Service usually weeds weight