urbpan: (dandelion)
 photo IMGP3459_zpsfwzr8kt7.jpg

The plant is a black cherry Prunus serotina, a weedy little tree found throughout the New World. The leaf bears the mushroom-like galls of a tiny arachnid, the mite Eriophyes cerasicrumena. The animals are living inside the protuberance.

The white discoloration patterns on the leaf are feeding marks left by leafhoppers--small (but enormous compared to the mites) insects that puncture the leaf and feed on the fluid within.

Thanks always to Charley Eiseman, who expertly divines animals from the marks they make on plants. He rears galls to identify the adult insects--I think he has discovered new or locally unknown species doing this.
urbpan: (dandelion)
 photo P1030350_zpszuabny5s.jpg
Common, but not familiar. That's how I'd sum up the humble sawfly (subgroup of Hymenoptera: Symphyta*). As an adult it looks like a wasp with no waist--females have an ovipositor that cuts into plants, giving them their common name. As larvae, sawflies resemble caterpillars so closely that online caterpillar guides are cluttered with them. Unlike most caterpillars, sawfly larvae are often not distinctive enough to be identified to species. This one was feeding on weedy black cherry Prunus serotina** leaves in the yard.


* "With plants"

** "Plum-tree, happening late"

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