Bioactivity Assays of Plant Extracts 0.3％SN-016 AS on Controlling Root-knot Nematodes
In order to screen efficient,low toxicity,safe,residue-free and environmentally friendly new plant ori-gin nematicides,the project team of the Weifang Plant Pathogenic Nematode Joint Research Team conducted bio-activity assays of the plant extracts 0.3％SN-016 AS on controlling root-knot nematodes.The project team used the"Z"shaped five-point sampling method to collect soil samples of Cucumber Root-knot Nematodes,Tomato Root-knot Nematodes and Watermelon Root-knot Nematodes at the experimental sites.In the laboratory,the pro-ject team used the centrifugal suspension method,combined with Cobb sieving separation method,to separate the infecting second-instarred larvae of Meloidogyne incognita Chitwood.The results show that the average mortality rates of infecting second-instarred larvae were respectively 97.18％,81.74％,44.39％,14.62％and 8.81％in the treatment 1(concentration 8g/L),treatment2(concentration o4g/L),treatment 3(concentration 2g/L),treatment 4(concentration 1g/L)and treatment 5(concentration 0.5g/L).The conclusion is that the average mortality rates of infecting second-instarred larvae were respectively 97.18％and 81.74％in treatment 1(concentration 8g/L)and treatment 2(concentration 4g/L).This indicates that the plant extracts 0.3％SN-016 AS has a good bioactivity a-gainst infecting second-instarred larvae of Cucumber Root-knot Nematodes,Tomato Root-knot Nematodes and Watermelon Root-knot Nematodes.
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