| Summary: | <i>Pochonia chlamydosporia</i> is widely applied in many countries as a biocontrol fungus against parasitic nematodes in plants. In a field experiment, the combined use of <i>Bacillus nematocida</i> B16 increased the biocontrol efficiency of <i>P. chlamydosporia</i> ZK7 against <i>Meloidogyne incognita</i>. Further study indicated that the colonization of <i>P. chlamydosporia</i> ZK7 in the rhizosphere soil and the roots of tomatoes was significantly higher in the combined use group than in the control group. Gas chromatography was conducted to determine the effects of signaling substances. Five compounds, hexanal, (E)-2-hexenal, furfural, benzaldehyde, and 2-nonanone, were found to be highly altered in the volatile compounds produced in the soil under the combined application. The changes in benzaldehyde and 2-nonanone were the main factors that resulted in an increase in the colonization of fungi <i>P. chlamydosporia</i> ZK7 in the tomato roots. Furfural was the main volatile substance that affected the colonization of fungi <i>P. chlamydosporia</i> ZK7 in the soil. The combined use of <i>B. nematocida</i> B16 and <i>P. chlamydosporia</i> ZK7 altered the volatile ranges and resulted in increased colonization of biocontrol fungi and improved biocontrol efficiency against nematodes. This combined model could be used to promote the ability of biocontrol fungi to control root-knot nematodes.
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