Table 3 Percent of elm bark beetles moribund or deada following various exposures to elm bark treated with insecticides.b
Week post treatmentExposure durationCarbarylMethoxychlorChlorpyrifosControl
European elm bark beetle, Scolytus multistriatus
Week 010 sec.10/1010/1010/1000/0
1 min.30/3030/4030/1000/20
3 hrs.100/100100/10090/1000/30
Week 110 sec.0/500/30100/1000/0
1 min.0/10/080/1000/0
3 hrs.100/100100/90100/1000/0
Week 310 sec.0/00/00/1000/0
1 min.0/100/00/500/0
3 hrs.100/8070/50100/1000/0
Week 610 sec.0/200/00/900/0
1 min.0/400/00/1000/0
3 hrs.100/10090/100100/1000/0
Week 1010 sec.0/00/00/200/0
1 min.0/010/1040/1000/10
3 hrs.80/9090/100100/10010/20
Native elm bark beetle, Hylurgopinus rufipes
Week 010 sec.0/4010/60100/1000/30
1 min.0/500/30100/1000/60
3 hrs.70/8040/80100/1000/40
Week 110 sec.0/00/20100/1000/0
1 min.xxbxx100/100xx
3 hrs.xxxxxxxx
Week 310 sec.0/00/00/200/0
1 min.0/00/020/800/20
3 hrs.20/400/0100/1000/20
Week 610 sec.xxxxxxxx
1 min.xx0/020/1000/20
3 hrs.xxxxxxxx
Week 1010 sec.0/4010/100100/10010/10
1 min.10/200/5010/700/20
3 hrs.50/8080/80100/1000/20
  • a Ten beetle replicates at each exposure after 3 hr/24 hr recovery period. E.g., 30/100 = 30% moribund or dead 3 hr after exposure, 100% moribund or dead 12 hr after exposure.

  • b Owing to insufficient supply of beetles only 5 H. rufipes/exposure were tested during weeks 1, 2 and 3; xx indicates no test was made. Other tests used 10 beetles each.