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Pin Oak Dropping Hard Pellets: Insect Frass

Mature Pin Oak Over Deck Drops Tiny Hard Pellets

Pellets (1/16") fall in bird bath, swell, turn green like algae. First time in 10 years.

Expert Hypothesis

Likely insect frass (poop). Dry pellets absorb water, swell. Send close-up photo with ruler for ID. Probably a nuisance; many insects are periodic (season or two).

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