In the spring, the adult caterpillar spins a cocoon and ... it is not known to cause any serious damage. 8. Spongy Moth (Formerly Known as the Gypsy Moth) Not exactly a garden caterpillar, the ...

The caterpillar will turn into a spongy moth. The agency planned to spray Bacillus thuringiensis var. kurstaki, or Btk, a naturally occurring soil bacteria that kills gypsy moth caterpillars ...