兴凯湖松瘤锈病损失量的研究

STUDY ON THE LOSSES OF XINGKAI LAKE PINE GALL RUST

兴凯湖松瘤锈病是中国东北地区的严重树木干部病害,严重地影响了树木的生长、结实量和天然更新。研究结果证明当病级达到Ⅲ时,与正常树木相比,结实量减少71—92％,更新频率减少53％,直径年平均生长量、树高年平均生长量,材积年平均生长量分别减少57.4％、46.4％、80.5％。在研究的基础上,确定树木病级达到Ⅲ级时为防治指标。

The Xingkai lake pine (Pinus takahasii Nakai) gall rust is a serious stem rust in Northeast China. The disease seriously affected the growth of trees, amount of bearing fruit and natural regeneration. It has been shown that when the disease damage severity reaches grade Ⅲ, the fruiting rate will be reduced by 71—92%, the regeneration frequency will be reduced by 53% compared with healthy trees, the annual mean increment in diameter, height and volume will be reduced by 57.4%, 46.4% and 80.5%, respectively. Based on studies, the disease damage grade Ⅲ is set as the low limit for control.