The pales weevil, Hylobius pales (Herbst), and the pitch-eating weevil, Pachylobius picivorus (Germar), are pests of plantation pines in the eastern United States. Dispersal patterns of these species were studied in the summer of 1989 using pitfall traps baited with ethanol and turpentine, and mark-and-recapture techniques. Approximately 17% of H. Pales and 34% of P. Picivorus were recaptured. Most pales weevils were recaptured in the immediate vicinity of the release point, whereas pitch-eating weevils appeared to disperse farther before responding to the baits. Marked weevils were recaptured up to 8 wk following the release. No gender differences were found in recapture rates. Pronounced temporal differences in recapture rates were observed, with more weevils attracted to baits in spring than in summer. A separate baited trap was developed to monitor weevil flight. Total weevil numbers, and female H. Pales considered singly, were more commonly caught at 81 cm than 160 cm. The role of dispersal and migration in pine root weevil ecology is discussed with respect to the ability of these species to colonize new habitats.
|Number of pages||8|
|State||Published - Dec 1 1990|
Bibliographical noteFunding Information:
We thank the Kirk Company of Wautoma, Wis., for the study sites and assistance with trap installation, and L. Zastoupilfor his valuable advice. M. Bleck,J. Graetz, and L. Kellner assisted with data collection. We also thank D. B. Hogg and D. K. Young for reviewing this manuscript. This research was supported by the Christmas Tree Producers Associationsof Wisconsin, Minnesota, Michigan, and Illinois; the Wisconsin Department of Agriculture; Trade & Consumer Protection Sustainable Agriculture Grant 8825; USDA 86-CRCR-I-2077; USDA 86-FSTY-9-021O;Sigma Xi Grants-in-Aid of Research; the University of Wisconsin Applied Research Program; and the University of Wisconsin-Madison College of Agricultural and Life Sciences.
© 1990 Entomological Society of America.
- Pine root weevils
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Insect Science