Ways to obtain virus-free seedlings of pear, apple and longan

The way for pear, apple, longan and other plants to obtain virus-free seedlings is micro-tip grafting virus-free. According to the relevant data, the virus-free method of micro-tip grafting is to graft the stem tip of 0. 1 ~ 0.2mm scion to the aseptic seedling in the test tube, and then continue to cultivate in the test tube to synthesize the whole plant. Experiments show that the characters of virus-free plants are better than those of susceptible plants.