shatangju_control_02
Three-year-old seedlings of Shatangju mandarin (Citrus reticulata Blanco cv Sha-tangju) and lemon (Citrus limon (L.) Burm. F.) were grafted with CLas-infected and CLas-free buds. The department of Qingyuan National Citrus Seedling Breeding Base (Guangdong, China) provided vigorous shatangju and lemon seedlings, which were grown as part of a certification program. Buds from disease-free, healthy citrus plants were used to mock-inoculate the control plants