Here are some studies that detail the effectiveness of Verbenone in controlled studies conducted by and for several Towns
Studies were implemented that used Verbenone in both integrated situations and non-integrated situations . ie:
Most studies concluded that treatment with verbenone pouches at roughly 16.5 yd centers is a useful tool for protecting trees from attack by the mountain pine beetle provided that Verbenone is used as part of a multi-year integrated pest management program that also includes disposal of all infested trees on the area to be protected.
Tips for Keeping your Trees Protected:
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.
The attack rate in untreated stands was roughly three times that of treated stands in both California and Idaho, even at this low application rate.
Operational Success of SPLAT Verbenone Against the Mountain Pine Beetle: Most studies concluded that treatment with SPLAT paste had a very high efficacy rate.
After being deployed in the field for 23 days, dollops of SPLATVerb (Figure 5) still contained 40% of their original concentration of verbenone, and it was not until 12 months in the field that trace amounts of chrysanthenone, a compound with no known effects on bark beetle behavior (see Chemical Stability in the Forest Environment for related issues), were detected (C.J. Fettig, A. Mafra-Neto, and A.S. Munson, unpubl. data, Jan. 15, 2013).
Although this research is in the early stages of development, SPLATVerb appears promising for individual tree protection as 100% tree protection was observed, whereas 93.3% tree mortality occurred in the untreated control. (C.J. Fettig, A. Mafra-Neto, and A.S. Munson, unpubl. data, Jan. 15, 2013).
In another recent study, on SPLAT Verb efficacy on individual lodgepole pines, there was a zero percent mortality rate on trees treated with SPLAT Verb, compared to a 93% mortality rate in untreated trees. In small stands, treatment with SPLAT Verb proved nearly twice as effective as an alternative verbenone product and reduced tree mortality compared to an untreated control by a factor of 6.
Operational Success of Verbenone Against the Southern Pine Beetle: This study concluded that treatment with Verbenone had a high efficacy rate against SPB when used in a strong program of forest management.
In a Journal of Forestry article entitled, "A Scentsible Approach to Controlling Southern Pine Beetles: Two New Tactics Using Verbenone", results of an early study using systhetic beetle pheromones for controlling southern pine beetle infestations - verbenone - were introduced.