THE BIOLOGICAL ACTIVITIES OF YELLOW AZALEA,RHODODENDRON MOLLE G.DON AGAINST THE VEG-ETABLE LEAFMINER,LIRIOMYZA SATIVAE (DIPTERA:AGROMYZIDAE)

The results of laboratory and greenhouse bioassays indicated that Rhodojaponin\|Ⅲ(Abbr.R\|Ⅲ) and extracts of flowers from Rhododendron molle G.Don possessed signficant feeding inhibition and insectcidal properties against the larvae and adults of Liromyzia sativae.Treated with 500?mg/L R\|Ⅲ,1?000?mg/L molosultap,and 10?000?mg/L methanol(MeOH),ethyl acetate (EtOAc),CH 2Cl 2,methanol\|water(MeOH\|H 2O) extracts,the rates of feeding inhibition were 77 34%,74 30%,82 15%,77 50%,67 33%,62 85% against the 2nd instar larvae,and were 67 66%,55 21%,49 72%,54 26%,46 81%,38 53% against the 3rd instar larvae,respectively;LC 50 values against the 2nd instar larvae were 208 65,166 05,2 74×10 3,766 72,5 95×10 3,1 85×10 3mg/L,and against 3rd larvae were 300 62,256 00,4 33×10 3,1 03×10 3,9 79×10 3,and 2 62×10 3mg/L,respectively.Against the adults,LC 50 values of R\|Ⅲ,EtOAc extract and molosultap were 159 07,723 87 and 134 55mg/L respectively after treatment for 24?h.