云杉美景梢锈病的初步研究

云杉美景梢锈病是为害青海云杉嫩梢的一种锈病。主要分布在甘肃西部的祁连山北坡东段海拔２６００～２８００ｍ的云杉林内。病部受病原菌刺激而呈畸形，针叶肥大而略弯曲变成香蕉状。颜色由桃红转为桔黄，色泽鲜艳，病梢形似花朵。性孢子器近圆瓶状，几乎全部突出寄主组织。锈孢子器长条状，直径大的可超过０．７ｍｍ，其发病期比青海云杉叶锈病早约一个月。

A Preliminary Study on Beauty-Shoot Rust of Spruce

Beauty-shoot rust of spruce,which occurred mainly on sea level 2600-2800 me-ter in loose stand of spruce forest of north slope in eastern section of Qilian Mauntain inwestern part of Gansu province,was a young shoot rust on Picea crassifolia Kom.Thepathogen stimulated the infected portion to be enlarged in malformation.Needles became ba-nana shaped.Its color changed from pink to orange,brilliant and beautiful,just as blossomedflowers. Pycnia were flask shaped,entirely on host tissue. Aecidium measured as loiig as thediseased needle,its diameter was over 0.7 mm. This disease occurred nearly one month earli-er than Chrysomyxa qilianensis.