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磷化氢环流是一个复杂的过程,既然要掌握有效的浓度,又要维持足够的密闭时间。在一定的磷化氢浓度下,一次性全部杀死粮内害虫的最低密闭时间应等于施药后磷化氢浓度上升到杀虫有效浓度的时间+杀死该粮堆内害虫成虫和幼虫的时间+杀死成虫死亡前产出的卵在此环境中的孵化时间或存在的蛹的发育时间+杀死卵孵化出的幼虫和成虫的时间。试验证实,在粮温10~24℃、磷化铝3 g/m剂量下,采取环流熏蒸措施,杀死玉米象和赤拟谷盗最低需要21天,杀死谷蠹需要26~28天。
Circulation of phosphine is a complex process, since the effective concentration to master, but also to maintain adequate sealing time. At a certain concentration of phosphine, the minimum time of complete kill of the foodborne pests at one time should be equal to the time required for the phosphine concentration to rise to the insecticidal effective concentration after the application + to kill the adults and larvae of the pests in the foodstuff Time + Egg production before the death of the adult hatch time in this environment or pupa developmental time present + Time to kill larvae and adults hatched by eggs. Experiments confirmed that the grain temperature 10 ~ 24 ℃, aluminum phosphide 3 g / m dose, to take circulating fumigation measures to kill corn and red tarragon aspirants need 21 days minimum, the need to kill Shui Ye 26 to 28 days.