Abstract: Plant disease was controlled to some extent by plant residues. In order to provide basis for further study on the ecological control mechanism of broccoli residues on cotton Verticillium wilt, the safety of broccoli residues on cotton growth was discussed, and the control effect of broccoli residue on Verticillium wilt was evaluated by greenhouse and field experiments. Cotton was planted at culture medium mixed with crushed broccoli residues, 7 days and 30 days after decomposition at (28±2)℃, respectively. The emergence rate and plant height of cotton and the control effect of Verticillium wilt were determined. Greenhouse experiment showed that the application of broccoli residues had different effects on the growth of cotton. When the proportion of broccoli residues were 1% -3% at 7 days after decomposition, there was no significant difference in emergence rate between treatments, but the plant height were promoted by 19.46%, 42.41% and 36.96%, respectively. When the proportion of broccoli residues was 5%-14%, there were significant inhibitory effects on cotton emergence. When the proportion of broccoli residue were 1%-14% at 30 days after decomposition, there was no significant difference in emergence rate in comparison to control. Meanwhile, the incidence and disease index of Verticillium wilt were significantly decreased after treatment with broccoli residues. The relative control efficacy of broccoli residues on Verticillium wilt reached to 72.55%. Field experiments showed that the control efficacy of broccoli residues on Verticillium wilt was 43.06% during the whole growth period of cotton. The results could provide theoretical basis and technical guidance for further study on the ecological mechanism of broccoli residues in controlling cotton Verticillium wilt, and finally provide new ways and ideas for green control of cotton Verticillium wilt and reduction of chemical pesticides.

Key words: broccoli residues, cotton, safety, Verticillium wilt, control effect