Field tests of denatonium benzoate to reduce seedling damage by pocket gophers (Thomomys talpoides Rich.)

摘要: Abstract The repellency of a bitter compound, denatonium benzoate, to reduce pocket gopher damage conifer seedlings was tested in two independent field trials Oregon and Idaho. In the trial (1992 1993), treatments included benzoate tablet placed in-ground with seedling roots; plus foliar spray applied both roots foliage; no chemical application (i.e. control). No significant difference between noted for ponderosa pine (Pinus Dougl.) or Douglas fir (Pseudotsuga menziesii (Mirbel) Franco) suffering gopher-related mortality. Non-animal mortality (58.2% all seedlings) accounted greater loss than gophers (38.2%). Composite foliage composite soil samples collected from treatment plots were negative presence benzoate. Idaho (1993 1994), similar (but an additional spray-only treatment) used on seedlings. There levels treatments. A large portion (72.5%) destroyed by gophers. It appears that as evaluated these trials, is not effective repellent.