大叶白蜡树锈病及其重寄生菌研究

 小叶白蜡树锈孢锈菌(Aecidium fraxinibungeanae Diet.)引起大叶白蜡树(Fraxinus chinensis var.rhynchophylla Hemsl)锈病为国内新记录。该锈病在我国重要白蜡产区乐山市严重发生,病株率和病叶率分别可达100%和56%,造成叶片病部坏死,病叶脱落,严重影响白蜡产量。大叶白蜡树锈病菌的重寄生菌(Tuberculina sp.)为国内外首次报道。该重寄生菌在乐山市及雅安市大叶白蜡树锈病菌上寄生很普遍,自然重寄生率达46.8%。重寄生菌寄生在大叶白蜡树锈菌春孢子器(锈子器)出口处,阻碍春孢子(锈孢子)的释放。本文还报道了大叶白蜡树锈病的危害、症状特点、病原形态特征及大叶白蜡树锈病菌的重寄生现象和重寄生菌形态特征。

STUDIES ON ASH (Fraxinus chinensis var. Rhynchophylla)RUST AND THE HYPERPARASITE OF ASH RUST PATHOGEN

Fraxinus chinensis var. rhynchophylla rust caused by Aecidium fraxinibungeanae is a new record in China and is an important disease of ash in Leshan and Yaan city, Sichuan. The percentages of disease plant and the disease leaf reach 100% and 56% respectively when the diseases is serious. The disease place of the leaf is necrosis and leaf casting. The output of the Chinese wax is reduced seriously.A hyperparasite( Tuberculina sp.)of A. fraxinibungeanae was first time reported in the world. The natural hyperparasitic percentage averaged 46.8% in Leshan and Yaan city. This paper reported the damage, symptom of the ash rust and the morphological characteristics of the ash rust pathogen.The hyperparacitism of A. fraxinibungeanae and the morphological characteristics of the Tuberculina sp. were also reported.