Here are some studies that detail the effectiveness of Verbenone in controlled studies conducted by and for several Towns.
Longevity Comparison between BeetleBlock and Contech Verbenone
In a study produced by the USDA Forerst Service in Missoula Montant in 2007, it was found that the effeciiveness longevity for BeetleBlock Verbenone was higher and longer than the Contech Verbenone. Between May 19 and September 2007 at a mean temperature between 75.4 and 76.8 degrees, the BeetleBlock pouches lasted 103 days in sun and 131 days in shade while the Contech product only lasted approximately 75 days.. This duration of effectiveness probably accounts for Contech's instructions to treat the trees twice between April and September while BeetleBlock recommends only one application during peak flight time between end May and July.
Attack around trees treated with Verbenone was substantially lower than around both pheromone-baited and untreated control trees, amounting to just 13.5% overall... Our results confirm that verbenone is an effective deterrent to attack by the Mountain Pine Beetle. However, they also confirm that the effect of verbenone is not absolute.
We conclude that the Verbenone pouch manufactured by Pherotech International is effective at reducing the risk of mass-attack by the Mountain Pine Beetle when used as directed on the label and applied at the appropriate time.
Some often-quoted, less successful studies done in 2000-2001 used much smaller Verbenone pouches.
"The original pouch had 4.6 grams of active ingredient in a plastic like matrix. The new and improved pouches have 7 grams absorbed in a sponge. The sponge provides for a more uniform release rate and the larger quantity provides for a longer lasting effect."
Alan Vaudry
New Product Development Manager
Phero Tech International Inc.
Dataweb, Inc
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