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在20℃和60%温湿度条件下,分别测定了氧硫化碳、异硫氰酸甲酯(Methyl isothiocyanate,MITC)等7种新型熏蒸剂对小麦网腥黑穗病菌(Tilletia caries(DC.)Tul.,TCT)的熏蒸效果。结果表明,除MITC外,其他6种熏蒸剂均不能完全杀灭TCT病菌;MITC熏蒸120h可有效杀灭TCT病菌,其LD90、LD95、LD99、LD99.9963分别为15.438、17.046、20.530、32.414g/m3。但是,由于小麦对MITC的高吸附性导致熏蒸剂空间浓度过低,使得有载物熏蒸试验中投药50、100g/m3MITC均未能有效杀灭小麦中的TCT病菌。残留检测结果表明,散气16d后小麦中MITC残留量分别降至0.29、1.07mg/kg,残留较高。结论:MITC对TCT有很好的杀灭效果,但由于小麦对MITC的吸附性很强,需进一步研究熏蒸方式,方可实际应用。
Seven new fumigants such as carbon oxysulfide and methyl isothiocyanate (MITC) were tested on Tilletia caries (DC.) At 20 ℃ and 60% respectively. Tul., TCT) fumigation effect. The results showed that, except for MITC, the other six kinds of fumigants could not completely kill TCT pathogens; MITC fumigation 120h can effectively kill TCT pathogens, the LD90, LD95, LD99, LD99.9963 were 15.438,17.046,20.530,32.414g / m3. However, due to the high adsorption of MITC on wheat, the spatial concentration of fumigant was too low, so 50 and 100 g / m3 MITC in the fumigation of the carrier did not effectively kill the TCT in wheat. Residue test results showed that residual MITC decreased to 0.29 and 1.07 mg / kg respectively after wheat leaves were scattered for 16 days, with a higher residue. Conclusion: MITC has a good killing effect on TCT. However, due to the strong adsorption of MITC on wheat, it is necessary to further study the fumigation method before practical application.