Mariah and I came across it while walking through the SF botanical gardens. The funnels end in a white bucket containing a green goo. I thought it was for bugs, but there were suprisingly few in the goo. And why the many layers of funnels?
UPDATE: From Brit – “That is a funnel trap to collect bark beetles. The thing that is attached to the funnel is a Lure that releases some kind of phermone or hormones that attracts the beetles. The green goo is most likely some kind if non-toxic anti freeze. The multi layer of funnels increases the surface area for the beetle to land and slide down into the trap.”
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