Several CUs of black and orange "looper" caterpillars on leaves. CUs of caterpillar jaws working as they eat. CS and MS of damaged cabbage fields. CSs of borer damage on corn stalk. CUs of open cut in corn showing wriggling corn borer. Shot of corn borer imbedded in ear of corn. Shot of borer wriggling in corn stalk. Shots of tractor ploughing corn stubble in autumn. Shot of horse-drawn plough ploughing under remains of cabbage field in autumn. Shot of farmers gathering and burning crop debris in fall. Interior shot of field-laboratory showing entomologists working at microscopes.