Biological Control Agents

International Symposia on Biological
Control of Weeds


Lead Author Last Name: Zwölfer



ArticleLead AuthorYear
Current investigations on phytophagous insects associated with thistles and knapweedsZwölfer, H.1969
Problems involved in host-specificity and screening tests - Introduction to the subjectZwölfer, H.1969
Competition and coexistence in phytophagous insects attacking the heads of Carduus nutans L.Zwölfer, H.1971
Insects and thistle heads: Resource utilization and guild structureZwölfer, H.1984
Topical colloquiumZwölfer, Helmut1971
footer line
USDA Forest Service Bugwood University of Georgia