Date of this Version
During fall, 1977, four potential chemical methods for controlling pine voles (Pitymys pinetorum) were evaluated on 12, one hectare plots in three apple orchards in the lower Hudson River valley. Each plot consisted of 45 trees. Three plots were treated with endrin, applied at the recommended rate of 1.5 lbs. per acre; two were treated with 2% technical Vacor (RH 787), applied in an unpelletized meal formulation at a rate of 60-70 gms per tree; two received 10% Vacor in an egg-sugar mix (marketed for human consumption as "Marshmallow Fluff") applied at the rate of 5-10 grams per tree; two received Vydate, a systemic nematocide highly toxic to rodents, at the maximum recommended rate of 15 lbs/acre; and three served as controls. Prior to treatment, all plots were sampled by live trapping and use of an apple index to determine the presence and abundance of pine voles and meadow voles (Microtus pennsylvanicus).