In San Jose, Milpitas or Mountain View, hordes of red, orange, yellow and white western tussock moth caterpillars are blanketing trees, dive-bombing playgrounds, crawling up buildings and marching down the sidewalk, long black antennae leading the way. Last year’s boom left trees stripped of leaves and playgrounds covered in inching pests. And those infestation invasions usually happen only every seven to 10 years.
So why are they back again? Even the experts don’t know for sure, but it’s creeping plenty of people out.