黄杜鹃 (Rhododendronmolle)中活性最高的化合物闹羊花素 (Rhodojaponin) -Ⅲ在花、嫩叶、根、茎中的含量分别为 0 2 0 %、0 1 4 %、0 1 1 %、0 0 8% ,其花、嫩叶、根的粗提物对菜粉蝶 5龄幼虫和斜纹夜蛾 3龄幼虫具有一定的拒食作用 ,而茎无明显的拒食效果 黄杜鹃花、嫩叶、根、茎各部位甲醇粗提物在 φ =1 0 0 %时对菜粉蝶 5龄幼虫 2 4h的拒食率分别为 92 76 %、86 78%、74 90 %、6 3 80 % ,对斜纹夜蛾 3龄幼虫的拒食率分别为 89 94%、80 0 6 %、73 4 8%和 6 3 2 2 % ,Rhodojaponin -Ⅲ的含量与其拒食活性成正相关 Rhodojaponin-Ⅲ, the most active compound in Rhododendron molle, was 0 2 0%, 0 1 4%, 0 1 1%, 0 0 8%. The crude extracts of flowers, young leaves and roots had certain antifeeding effects on the 3rd instar larvae of Pieris rapae and the 3rd instar larvae of Spodoptera litura, while the stems showed no significant antifeeding effect. Yellow azaleas, young leaves, roots and stems The antifeedant rates of crude methanol extracts from various parts of the methanolic methanol extract at φ = 100% were 92 76%, 86 78%, 74 90% and 63 80%, respectively, at the 4th instar larvae of S. litura The antifeedant rates of larvae were 89 94%, 80 0 6%, 73 4 8% and 6 3 2 2%, respectively. The content of Rhodojaponin-Ⅲ was positively correlated with its antifeedant activity