THE REASON OF DIFFERENT EFFECT ON KILLING INSECTS WITH NORMAL PHOPHINE FUMIGA TION AND INTERMITTENT FUMIGATION

The experiment used two methods of phosphine normal fumigation and phosphine intermittent fumigation for killing insects in grain storage.The maximum PH 3 concentration,the values of Ct product and effect on killing insects in the experiment had been analyzed.The reason that was failure for normal fumigation had been discussed.Using intermittent fumigation instead of ormal fumigation was recommended in this paper.