一、发病症状果锈病主要危害无花果叶片、幼果及嫩枝。叶片在5月上旬发病,初期叶片正面出现1毫米大的黄绿色小斑点,逐渐扩大成0.5~l厘米的橙黄色圆形病斑,边缘红色。发病后1~2周,病斑表面密生鲜黄色小粒点,从中分泌出带有光泽的黏液,以后变黑,其后,叶背面隆起,生出许多土黄色的毛状物,内含有大量的锈孢子。嫩枝受害时,病部橙黄色,稍隆起,呈纺锤形。染病后的幼果表面发生圆形病斑,初为黄色,后变褐色,病果局 First, the incidence of symptoms of rust, the main fruit rust fig leaves, young fruit and twigs. Leaves in early May onset, the initial emergence of 1 mm leaves a large yellow-green small spots, and gradually expanded into 0.5 ~ l cm orange round lesions, the edge of the red. 1 to 2 weeks after onset, the lesion surface secreted bright yellow small particles, from which a glossy mucus secreted, then black, then, the back of the leaf uplift, giving birth to many khaki hair, containing a large number of Rust spores. Shoot damage, the Ministry of orange-yellow, slightly elevated, was spindle-shaped. After the onset of young fruit round surface lesions, the beginning of the yellow, brown later, the outcome of the bureau