I have twice seen a foamy “blob” at the base of willow trees which I had thought were caused by Spittlebugs. However, I have since learned that this is a phenomena called Stemflow. It occurs on trees after a good rain following a dry period. Water runs down the trunk of the tree and collects vari…

Surprisingly, no such observation field seems to exist. Neither does one for copal.

Stemflow on trees

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