Aphid infestation occurs every year in the fall. One reason they're worse this year due to the amount of rainfall we've had, resulting in increased vegetative growth. Not sure if there's anything else involved ... maybe part of multi-year cycle or something.
Box elder bugs are certainly a cyclical problem. We had major box elder bug problems every spring and fall here in Drum a few years back. There haven't been any for the last two or three years now though.
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