Table 2 Effects of insecticides on colonization of elm logs by European elm bark beetles.a
TreatmentNumbers of egg galleries and (brood)
0b51020
Chlorpyrifos0000
Methoxychlor0000
Carbaryl04(479)15(509)0
Control12(1000c)4(123)12(677)0
  • a Fig. 2 shows mortality of colonizing adults.

  • b Weathering period (weeks) between insecticide treatment and introduction of colonizing adults.

  • c Brood adults, pupae and larvae (all or almost all fully grown).