秦巴山区马尾松瘤锈病研究

马尾松瘤锈病在秦巴山区分布于南郑、宁陕等５个县（区），其中南郑县发生严重。被害松树在主干、侧枝和裸根上形成肿瘤，每年４月中旬在瘤上形成锈孢子器。马尾松病枝的结实量减少，种子质量明显下降；受害幼树的地茎和树高比健树均有减少。该病的病原菌为松栎栓锈菌。

On Gall Rust of Pinus massoniana in the Qinba Mountains

The gall rust of Pinus massouaina occured in six counties of the Qinba Mountains, ofwhich the most serious infection was found in Nanzheng county. Globose or subglobose gallswere produced on the stems, branches or air-roots of infected pines. In late April, aecia brokethrough the bark. The quantity and quality of seeds from diseased branches decreased significantly. The diseased trees growed slower than heathy trees. The results of inoculation in the field indicated that seven species of oaks were the alternate hosts of the disease, among them Quercusacutissima, Q. dentata and Q. variabilis were the most susceptible to the disease and then followed by Q. aliena var. acuteserrata and Q. glandulifera var. brevipetiolata. Castanea seguiniiand C. mollissima were the most resistant to the disease.