Toxicity of sulfocompounds in Alliums on Fusarium oxysporum f. sp.cubense and compound microencapsulation

【Objective】The objective of the study is to elucidate the inhibitory effects of six sulfocompounds from two Alliums and their microcapsule on the Fusarium oxysporum f. sp. cubense indoor and outdoor.【Method】Microcapsule suspensions containing S-methyl methanethio-sulfonate were prepared by interfacial polymerization. 【Result】The results showed that Dimethyl trisulfide and S-methyl methanethio-sulfonate exhibited strong inhibition effects on the fungus, up to 100%. Dimethyl disulfide also showed the same inhibitory effects with 200 μL and 100 μL treatments, while the other treatments were all under40%. The inhibition effects of compounds showed significant difference with different concentration. Microcapsule of S-methyl methanethiosulfonate showed certain control-release effect, which was related to the concentration. Compared with water,microcapsules showed some control effects in the pot experiment.At the early stage,the control effects of microcapsules were weaker than that of S-methyl methanethiosulfonate,but stronger at the late stage. 【Conclusion】The studies suggested that there are some sulfocompounds with strong effects on Fusarium oxysporum f. sp. cubense in two Allium and the microcapsule can extend the control effects.