Abstract:

To effectively prevent and control watermelon root-knot nematodes, the author chose greenhouses where 98% of watermelons were damaged by nematode and had no yield in 2020, compared the treatments of two compound microbial agents (Nematode Killing+Oligosaccharides Fosthiazate, treatment 1; Anti-Nemetode, treatment 2) with no nematicides application (CK), and studied the inhibitory effect of microbial agents on watermelon root-knot nematode, as well as the impact of microbial agent on watermelon yield and quality. The results showed that the two microbial agents had better effect on the growth of watermelon and the control of nematodes compared with CK. The yield of treatment 1 was 60912.0 kg/hm², and the yield of treatment 2 was 60393.6 kg/hm². The soluble solid content in the center of watermelon was 13.73% in treatment 1, and 13.30% in treatment 2, better than that of CK. The soluble solid content and yield were significantly different from those of CK. Under the treatment of compound microbial agents, the nematode population was much lower than that of CK, and at the same time, the plant roots in the whole growth period were not infected by nematodes, which was better than that of CK. In conclusion, compound microbial agents have a better application effect on the control of watermelon root-knot nematode.

Key words: root-knot nematode, microbial agent, watermelon, yield, quality