USDA-APHIS-PPQ, Otis Laboratory, 1398 West Truck Rd-, Buzzards Bay, MA 02542, USA.
J Econ Entomol. 2011 Feb;104(1):69-74. doi: 10.1603/ec10130.
Ash (Fraxinus spp.) logs, infested with fully developed, cold-acclimated larval and prepupal emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), were fumigated with methyl bromide (MeBr) at 4.4 and 10.0 degrees C for 24 h. Concentrations X time dosages of MeBr obtained were 1579 and 1273 g-h/m3 (24-h exposure) at 4.4 and 10.0 degrees C after applied doses of 112 and 96 g/m3, respectively. MeBr concentrations were simultaneously measured with a ContainIR infrared monitor and Fumiscope thermal conductivity meter calibrated for MeBr to measure the effect of CO2 on Fumiscope concentration readings compared with the infrared (IR) instrument. The presence of CO2 caused false high MeBr readings. With the thermal conductivity meter, CO2 measured 11.36 g/m3 MeBr per 1% CO2 in clean air, whereas the gas-specific infrared ContainIR instrument measured 9.55% CO2 as 4.2 g/m3 MeBr (0.44 g/m3 per 1% CO2). The IR instrument was 0.4% as sensitive to CO2 as the thermal conductivity meter. After aeration, fumigated and control logs were held for 8 wk to capture emerging beetles. No A. planipennis adults emerged from any of the fumigated logs, whereas 262 emerged from control logs (139 and 123/m2 at 4.4 and 10.0 degrees C, respectively). An effective fumigation dose and minimum periodic MeBr concentrations are proposed. The use of a CO2 scrubber in conjunction with nonspecific thermal conductivity instruments is necessary to more accurately measure MeBr concentrations.
受冷驯化的幼虫和预蛹绿灰象甲（Agrilus planipennis Fairmaire）（鞘翅目：象甲科）完全发育的白蜡（Fraxinus spp.）原木，用溴甲烷（MeBr）在 4.4 和 10.0°C 下熏蒸 24 小时。在分别施加 112 和 96 g/m3 的剂量后，在 4.4 和 10.0°C 下获得的 MeBr 浓度 X 时间剂量分别为 1579 和 1273 g-h/m3（24 小时暴露）。使用 ContainIR 红外监测仪和 Fumiscope 热导率计同时测量 MeBr 浓度，该计针对 MeBr 进行了校准，以测量 CO2 对 Fumiscope 浓度读数的影响，与红外（IR）仪器进行比较。CO2 的存在会导致虚假的高 MeBr 读数。使用热导率计，在清洁空气中，每 1%CO2 会测量到 11.36 g/m3 MeBr，而特定气体的红外 ContainIR 仪器会测量到 9.55%CO2 相当于 4.2 g/m3 MeBr（每 1%CO2 为 0.44 g/m3）。IR 仪器对 CO2 的敏感度比热导率计低 0.4%。通风后，将熏蒸和对照原木放置 8 周以捕获新出现的甲虫。没有任何受熏蒸原木中有 A. planipennis 成虫出现，而对照原木中有 262 只成虫出现（分别为 4.4 和 10.0°C 下的 139 和 123 只/m2）。提出了有效熏蒸剂量和最低周期 MeBr 浓度。需要使用 CO2 洗涤器与非特异性热导率仪器一起使用，以更准确地测量 MeBr 浓度。
