Wl. Tedders et Bw. Wood, PYRAMIDAL TRAPS FOR MONITORING THE PRESENCE OF PECAN WEEVIL (COLEOPTERA, CURCULIONIDAE), Journal of entomological science, 30(4), 1995, pp. 534-544
Pyramidal traps constructed of masonite and painted to reflect light l
evels ranging from 1 to 84% reflectance (black, shades of gray and whi
te) were evaluated for attractiveness to adult pecan weevils, Curculio
caryae (Horn). Black (1% reflectance) and dark gray (5% reflectance)
were found to be more attractive to weevils than traps having greater
reflectance (lighter grays and white). Dark gray traps captured almost
9 fold more weevils than did standard cone emergence traps. Dark gray
traps also captured weevils in orchards after the emergence period as
indicated by screen cone traps. Trap distances of 1.9 and 4.6 m from
tree trunks did not influence trap effectiveness. Trap density of 4/tr
ee did not provide an economic level of weevil control as measured by
number of infested nuts per tree. Traps positioned on the eastern side
of trees caught more weevils (alpha less than or equal to 0.05) than
traps on the northern side, but captures were not significantly differ
ent from those positioned at the southern and western sides of trees.