Apple stem pitting virus (ASPV) is the type species of the genus Foveavirus, family Betaflexiviridae
in the order Tymovirales. The virus can cause different pear diseases. Nowadays, the infection status and molecular characteristics of the virus in old pear trees have never been investigated. ASPV
isolate LYC is identified from an over 300-year-old tree of a local Pyrus bretschneideri cultivar ‘Chili’
specifically grown at Laiyang area, Shandong Province, China. ASPV-LYC possesses a chimeric
genome harboring a recombination region, is serologically and biologically related to other ASPV
isolates. It provides clues for understanding molecular evolution of ASPV. The photo is provided
by the research team of Prof. Hong Ni from Huazhong Agricultural University, China. See pages
2549–2560 for details.