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It is well known that sticky poplar buds falling on a car can seriously damage the paint. Also these scales from poplar stick to the paws and fur of animals like Velcro. Personally I don’t think the mentioned examples of sricky ‘cases’ explain the puprpose of the sticky buds. Indeed, what the reasons the sticky substances are used by poplar in buds.

I guess the bees could be a reason to collect the sticky substances. However, I can hardly see bees on poplars. Also, the sticky substances could prevent buds to be frozen in early spring (creating a time-delay in growth of buds). What is the right explanation?

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