declivity Webworms ( Hyphantria cunea ) were a new pot for me on a late stumble . I was continually crawl - out   by their frequent outcroppings in the tree diagram canopy as Michelle and I motor down back roads of Pennsylvania . The web masses clung to helpless tree . The nests hang in the air like little alien cocoons about to release ungodly multi - legged , humanity eating creatures . Michelle tried to put my fears to perch by announcing that despite their   troubling appearance and ability to defoliate entire trees , they are relatively harmless and go unnoticed most of the year .

I ’m unconvinced . They are aboriginal to North America but apparently start to migrate across the ball in the 1940 ’s . First conquer the former Yugoslavia and now interest several neighborhood of Europe . The Fall webworm is also rife throughout Japan , Korea , and China . They are in fact , strategically taking over the earthly concern , one hardwood Sir Herbert Beerbohm Tree at a time .

Fall webworms are not picky about the trees they take to suffice as host . They feast on pecan , walnut , American elm , hickory , and maples in the east . front-runner in the West include alder , willow , and cottonwood trees . Regardless of neighborhood , fruit tree diagram are always a pet for these silky sore eyes to raven .

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