In vitro Propagation of Senecio cineraria cv. Silver Dust Isolation and Expression Analysis of Key Genes Involved in Anthocyanin Biosynthesis of Cineraria A STUDY ON THE NUCLEAR POLYHEDROSIS VIRUS OF THE POPLAR LOOPER (APOCHEIMA CINERARIUS) Ⅳ. RECOVERY TESTS OF VIRUS THE QUANTITATIVE ANALYSIS OF PYRETHROIDS