Effect of different inoculation methods on Ditylenchus destructor infection in sweet potato
In this paper, the effect of the inoculation method on Ditylenchus destructor infection in sweet potato was discussed. The distribution of inoculated D.destructor in sweet potato stem and leaf tissues was investigated and the difference in infection between sprouted sweet potato and dormant sweet potato was also analyzed. The results showed that nematode infection value in sweet potato inoculated by solid-inoculum was the highest and it reached to 408 per g tissue with the most severe plant symptoms. The stem nematodes were detected as far as 90 mm from the stem base. Compared with the control, sprouted sweet potatoes showed the distinguished stage-dependent resistance. The paper is the first to discuss the farthest distance of the stem nematode distribution in the aerial part and the stage-dependent resistance in sweet potato, which would provide a theoretical basis for further elucidating the disease transmission route and disease prevention.