Spring 2009 Prevention Activities – Update 1
Pheromone Pouches: Everyone who has already ordered pheromone pouches can pick them up on Saturday June 13th at the county barn from 9am-noon. We’ll be in the lobby with your packs. For those who still want to order pheromones, you can now order with a credit card by going to the GCCI website (www.gcci.us) and clicking on the links. We will also be taking orders for pheromone packs at the barn if you want to stop by with a check. We plan on another distribution towards the end of the June.
Hot Yard now open on weekends: Gilpin County is now accepting hot logs on the weekends. You can take them to the Biomass Collection site and the site supervisor will check your load and then direct you to the drop off location. This is a quantum improvement in the operation of the biomass collection program and offers a final opportunity to get rid of infected trees in a safe manner. It is important to only haul in hot trees to the hot yard. You can check whether a tree is hot by peeling back the bark and looking for beetles. When dropping off loads at the collection site try to stay left at the gate so that we create a one way traffic pattern and help the site supervisor.
Spraying on the 18th: Safari Tree and Landcare (303-464-1613 safaritlc@comcast.net) will be in the area again on June 18th for spraying. Targeted spraying involves identifying your best trees and then selecting the ones you want to protect by spraying them. Deciding which trees are your best trees is a personal assessment that includes trees that are part of a wind break, add to the value of the property or have aesthetic or sentimental value.
When to stop cutting: I asked Dave Leatherman, a retired forest service entomologist, about the risk of cutting during beetle activity. His reply highlights the need to cut hot trees but delay general thinning until late fall.
Is there any valid science to the scenario that pine terpenes attract beetles and when should be people stop doing fire mitigation and beetle control?
I would call this one of those “in a perfect world” kind of things. IF you can avoid cutting during the cutting season and for 4-6 weeks prior (in other words June 1 to September 1), it would be preferable to cutting during that period so as not to risk attraction of both beetles. I have seen clear instances where it appears both beetles came into an area because of the scent from fresh cutting. Both beetles respond to attractant pheromones which include the aroma of pine terpenes as a basis for the compounds they modify internally and then emit as more specific, even better (for their purposes) materials. I was probably the one who started putting this into the mix of “best practices” many years ago. It has been overblown in some cases and I have since toned down my statements about it. What I would say now is that cutting work that reduces fire hazard (at any time) or properly treats infested beetle trees (prior to and right up to beetle flight) probably trumps the potential (but not automatic) risk of attracting beetles into a cutting activity area. If cutting can be avoided during (certainly) and in the month or so immediately prior to MPB flight (even better), then plan work accordingly. If not, and fire reasons or reduction of a local known population of beetles are dictating the need to cut, go ahead. It’s sort of like, if you are bleeding, and all you have to stop it is an unsanitized shirt which risks infection, go ahead and stop the flow. The known bleeding is worse than the potential for complications. Next time you’re in a situation where cuts are possible, have a sterile bandage with you as a safeguard.
Lastly I would say that if cutting is done any time between April 15 and October 15, the potential for Ips being attracted to the area and infesting the cut wood is very good, especially when the population is as high as it is in conjunction with a MPB epidemic. But in most instances I have seen, the likelihood of a build-up in the cut wood spreading to standing trees is relatively low UNLESS the cut wood is stacked right up against live trees and the area of treatment is in the 100′s of acres (as opposed to a few acres). For large areas of treatment, I would recommend cutting activity be done in the period of late fall-early winter (October 15 to January 1). And always stack the wood and slash out away from live trees and lop and scatter it when possible to facilitate drying, keep stacks low, burn in the winter if the threat of attacks on live trees and need for fuel reduction exceed anyone’s need to use the wood – these kinds of things.
OTHER: There are volunteer opportunities to help haul hot logs and slash. If you have a pickup or trailer and would like to help please send an email to info@gcci.us with your availability.
The GCCI website (www.gcci.us) has a number of new features including a great link on defensible space and a blog forum for community comments.
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Wes Isenhart
President, Gilpin County Citizens Initiative
303 582-5417
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