The Canadian Entomologist

Articles

VARIATION IN SOUTHERN PINE BEETLE ATTACK HEIGHT ASSOCIATED WITH PHORETIC UROPODID MITES1

D. N. Kinna1 and J. J. Witcoskya1

a1 Southern Forest Experiment Station, Forest Service-USDA, Pineville, Louisiana 71360

Abstract

Southern pine beetles (Dendroctonus frontalis) carrying phoretic Trichouropoda australis deutonymphs were caught in bucket traps baited with frontalin-alpha pinene at heights of 3, 6, and 9 m on the boles of loblolly pines. Of 8475 beetles collected, 36.3% carried uropodids or their pedicels. Beetles trapped at 3 m carried more pedicels than those trapped at 6 or 9 m, indicating that the flight of beetles is influenced by the presence of phoretic mites. Re-emerging parent beetles can be differentiated from brood adults by the color of the mite pedicels.

(Received May 20 1977)

Footnotes

1 The work herein reported was funded in part by the U.S. Department of Agriculture's Southern Pine Beetle Research and Development Program.