The area is infested with at least one hundred bull thistle plants. It is non-toxic. It is non-polluting. It is self dispersing. It can reduce the threat of ground- water pollution from herbicides.
Weevils can overwinter in the adult, egg or larval stage.
Rosette weevil damage changes the architecture of the thistle plant from a tall stem with many flowers to shorter multiple stems with fewer flowers. Printed in furtherance of the biological control of thistles and for public awareness. North Carolina Department of Agriculture, Plant Industry Div. Plant Protection Section. P.O. Box 27647 Raleigh, N.C. 27611.