Occurrence and sequence diversity of apple hammerhead viroid in major apple-producing regions of northern China.
Apple hammerhead viroid (AHVd) is an emerging pathogen with a global distribution in apple-growing regions. To clarify its occurrence and distribution in northern China, long non-coding RNA (lncRNA) sequencing combined with RT-PCR was employed to screen 502 apple samples from commercial orchards in Hebei, Liaoning, Inn...