In order to study the effects of 7 kinds of fumigant,such as metham sodium,dazomet,calcium cyanamide,methanal,1,3-dichloropropylene,dimethyl disulfide and methyl iodide on Fusarium oxysporum in soilless culture substrates after treatment at different times and with different concentrations,the experiments determined the quantity changes of Fusarium oxysporum with dilution plate method through indoor culture experiments.The results showed that all 7 kinds of fumigant could significantly reduce the number of Fusarium oxysporum.After 5 days fumigation with 120 mg · L-1 42％ metham sodium and 300 mg · L-1 98％ dazomet,the killing rate could reach up to 100.00％;after 8 days fumigation with 50 times diluted 40％ methanal,800 mg · L-1 calcium cyanamide,400 mg · L-1 dimethyl disulfide,150 mg · L-1 1,3-dichloropropylene and 300 mg · L-1 methyl iodide,the killing rate could reach 99.07％,98.71％,96.57％,94.86％ and 85.00％,respectively.Thus,all 7 kinds of fumigant had some effects on Fusarium oxysporum,and metham sodium and dazomet had the most significant effect on controlling Fusarium oxysporum at soilless culture substrates,and yet with very short fumigation time.The next effective were methanal and calcium cyanamide.%通过人工接种尖孢镰刀菌于无土栽培基质,采用稀释涂抹平板法测定基质中尖孢镰刀菌的数量变化,研究威百亩、棉隆、氰氨化钙、甲醛、1,3-二氯丙烯、二甲基二硫和甲基碘7种熏蒸剂不同浓度处理及作用时间对无土栽培基质中尖孢镰刀菌的作用效果.结果表明:7种熏蒸剂均可以显著降低基质中尖孢镰刀菌的数量.其中,120 mg·L-1 42％威百亩和300 mg·L-1 98％棉隆熏蒸5d对尖孢镰刀菌的灭杀率达100.00％;40％甲醛稀释50倍、800 mg·L-1氰氨化钙、400 mg· L-1二甲基二硫、150 mg·L-1 1,3-二氯丙烯和300 mg·L-1甲基碘熏蒸8d对尖孢镰刀菌的灭杀率分别达99.07％、98.71％、96.57％、94.86％和85.00％.由此得出,威百亩和棉隆对无土栽培基质中尖孢镰刀菌的灭杀效果最显著,且熏蒸时间短,其次为甲醛与氰氨化钙.
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