Most hairy caterpillars are harmless and beautiful to behold, intent only to eat their way to metamorphosis—right through Don’s garden, apparently. The hair-like bristles on caterpillars are.

The susceptibility of different larval instars of E. mollifera to B. thuringiensis (Bt), and the susceptibility of the 3rd instar to 3 commercial Bt formulations (Spicthurin, Spic Bio and Delfin) were investigated.