RT Journal Article SR Electronic T1 Efficacy of Bacillus Thuringiensis and Diflubenzuron on Douglas-Fir and Oak for Gypsy Moth Control in Oregon JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 240 OP 242 DO 10.48044/jauf.1987.050 VO 13 IS 10 A1 Jeffrey C. Miller A1 Kenneth J. West YR 1987 UL http://auf.isa-arbor.com/content/13/10/240.abstract AB The insecticides Bacillus thuringlensis (Bt) and diflubenzuron (DFB) were tested for the effect of killing second instar gypsy moth larvae on foliage of Douglas-fir and Oregon white oak. Larval mortality differed significantly between the insecticides and check treatments. No significant differences in larval mortality were observed after one treatment of Bt or DFB, or after two treatments of Bt. No significant differences were noted between larval mortality on the foliage of either host plant. Effects of the insecticides were apparent 64 days post-application for all treatments.