Table 1.
Disease indices of seven sweet potato varieties after graft inoculation of sweet potato virus disease (SPVD).
| Variety | Disease Index Calculated at 15 DAG | Disease Index Calculated at 30 DAG |
|---|---|---|
| Yushu No.2 | 12.14 ± 1.01abAB | 17.86 ± 1.01cB |
| Yushu No.4 | 5.71 ± 0.00abcABC | 10.00 ± 4.04cBC |
| Yushu No.6 | 2.86 ± 0.00bcdABCD | 7.86 ± 3.03cdBC |
| Yushu 12 | 2.86 ± 0.00bcdABCD | 5.71 ± 0.00cdBCD |
| Xushu 22 | 12.14 ± 1.01abAB | 26.43 ± 3.03bB |
| Ning 4-6 | 35.00 ± 1.01aA | 63.57 ± 11.11bA |
| Ningzishu No.1 | 23.57 ± 1.01aAB | 75.00 ± 13.13aA |
Data show mean ± SD. Different uppercase letters in the same column indicate significant difference at P < 0.01 levels by Duncan’s test. DAG, days after grafting.