疮痂病(续第8期第25页)发生症状此病主要危害新梢、嫩叶和幼果,也可危害花萼和花瓣。受害的叶片初期产生水渍状黄褐色圆形小斑点(见第2 1页图1),逐渐扩大,颜色变为蜡黄色,后病斑木质化而突起,多向叶背面突出而叶面凹陷,突起部位呈圆锥形的疮痂(见第2 1页图2),似牛角或漏斗状,表面粗糙,新梢叶片受害严重的早期脱落。病斑多时,叶片畸形扭曲。新梢受害症状 Scab (Continued on page 8, page 25) Symptoms The disease mainly affects shoots, young leaves, and young fruits, as well as calyx and petals. The affected leaves initially developed a watery, yellowish-brown round spot (see Figure 1 on page 21), gradually expanding to a waxy yellow color, with lignification and prominence after the lesion, prominence on the back and many foliage dents (See Figure 2 on page 2), resembling horns or funnels, with rough surfaces and sharp shootings on the shoot tip. Lesions, leaves deformed distortion. Shoot damage symptoms