That's because their activity is dictated by one thing and one thing only: mating. They have no natural predators here because they are not native to America.
They are a cold weather insect, so bats and spiders are out of the picture. They swarm at night so that birds are no problem, and the hatch in the spring at the same time the tress bushes and shrubs begin to sprout.
The only 2 options are spraying with horticultural oil in the spring, or cut down the tree/bush or shrub and plant something else.
Whoever is responsible for allowing this plague to enter the country has earned the same level of hatred as the Cambridge A-hole that allowed the Asian Red Lilly-Leaf beetle to ruin EVERYONE'S lillies in the region. I kid you not, these little red beetles have infested all of New England, and also have no natural predators in this country.
The state will harp on the recreational fisherman/boater about "invasive species" but when a business does even worse, I guess it's OK.
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