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放热式惰性气体发生器产生的气体,是由1％以下的氧,9％～9.5％左右的二氧化碳以及以氮为主的剩余气体组成的。已经发现,这种气体对在粮粒内外发育的各个发育期害虫均有致死作用。防治各种害虫以及各发育期的同一种害虫均需要一定的时间。一般而言,在粮粒内发育的蛹和老熟幼虫是最具有忍耐力的,而在粮粒外发育的未成熟幼虫和成虫最为敏感。大多数害虫的卵暴露于低氧气体下时并不具有特别的忍耐力,但经第一天发育后,则表现出增加忍耐力的趋势。在幼虫——蛹发育期,多数害虫的忍耐力也是随着虫龄的增长而增加的。在27℃,防治忍耐力最大的昆虫,最长的处理时间约为10天,但经3～5天暴露后,大多数害虫不是被杀死就是遭到严重的生理损害。处理温度降低,获得有效防治所需的暴露时间则明显地增加。
The gas generated by the exothermic inert gas generator is composed of 1% or less of oxygen, 9% to 9.5% of carbon dioxide and nitrogen-based residual gas. It has been found that this gas has a lethal effect on all developmental pests that develop both inside and outside the grain. Control of various pests and development of the same species of pests require a certain amount of time. In general, pupae and mature larvae developed within the grain are the most endurable, while immature larvae and adults developing outside the grain are the most sensitive. Most pests’ eggs do not have particular tolerance when exposed to hypoxia, but show a tendency to increase endurance after their first day of development. During larval-pupal development, the tolerance of most pests also increased with increasing worm age. At 27 ° C, the longest control and tolerance of insects, the longest processing time is about 10 days, but after 3 to 5 days after exposure, most of the pests are not killed or was severely damaged by physiological damage. Decreasing the treatment temperature significantly increases the exposure time required for effective control.