Table 1 Effects of insecticides on broods of European elm bark beetles in logs.
Treatments (4 each)Means and standard errors1
Beetles emerged per dm2 bark surfaceMortality of emerged adults2
Chlorpyrifos4.5 ± 2.3a99.8 ± 0.2a
Methoxychlor18.8 ± 6.4b80.2 ± 2.7ab
Carbaryl32.3 ± 9.2b65.9 ± 15.4b
Control35.6 ± 6.0b12.4 ± 1.4c

  • ↵1 Means in a column followed by different letters are significantly different (Student-Newman-Keals test, P ◀ 0.05)

  • ↵2 Percent of the beetles dead within 24 h of their emergence.