The only thing better is a fence – Connecticut Department of Forestry and Horticulture, Agricultural Experiment Station
An independent study was conducted by the State of Connecticut Department of Forestry and Horticulture, to test the effectiveness of deer repellents in Connecticut. 10 different commercially-available repellents were tested.
A summary of the study is as follows:
Effectiveness of Deer Repellents in Connecticut*
INTRODUCTION: 10 different commercially available repellents at 2 different locations in Connecticut were tested. The study included both positive (fence) and negative (no treatment) controls. Yews (evergreens) were planted in 2 blocks at each location in the Spring of 2006; each block had 12 groups of 6 yews. One of the 12 treatments was randomly assigned to each group of yews within each block. Repellents were applied based one manufacturer's label recommendations for the 2006 and 2007 growing seasons and application costs were recorded. A Protection Index was derived based on plant size and dry needle weights at the end of the 2007 growing season.
RESULTS: As noted by the Protective Index (%) in the table above, BOBBEX scored a 93% and was ranked higher than any other brand tested. Only a physical fence worked better!
*BOBBEX had no connection or involvement with the Experimental Station or this study, which was conducted at two locations in Connecticut. For a complete review of this study, you may download a copy the study below.