Boateng Kennedy, Lewis Kathy J
Phytopathology. 2015 Jan;105(1):69-79. doi: 10.1094/PHYTO-06-13-0175-R.
We studied spore dispersal by Dothistroma septosporum, causal agent of a serious outbreak of red band needle blight in lodgepole pine plantations in northwest British Columbia. Spore abundance was assessed at different distances and heights from inoculum sources and microclimatic factors were recorded during two consecutive years. Conidia were observed on spore traps from June to September during periods of rainfall. It was rare to detect spores more than 2 m away from inoculum sources. The timing and number of conidia dispersed were strongly tied to the climatic variables, particularly rainfall and leaf wetness. Should the trend toward increased spring and summer precipitation in the study area continue, the results suggest that disease spread and intensification will also increase. Increasing the planting distances between lodgepole pine trees through mixed species plantations and overall reduction in use of lodgepole pine for regeneration in wet areas are the best strategies to reduce the spread of the disease and enhance future productivity of plantations in the study area.
我们研究了引起不列颠哥伦比亚省西北部黑松人工林严重红带叶枯病爆发的 septosporum散斑壳的孢子传播情况。在连续两年中，评估了距接种源不同距离和高度处的孢子丰度，并记录了微气候因素。在降雨期间，6月至9月在孢子捕捉器上观察到分生孢子。在距接种源超过2米处很少检测到孢子。分生孢子散布的时间和数量与气候变量密切相关，尤其是降雨和叶片湿度。如果研究区域春季和夏季降水量增加的趋势持续下去，结果表明疾病传播和加剧也将增加。通过混交林增加黑松之间的种植距离以及总体减少在湿润地区使用黑松进行更新，是减少疾病传播和提高研究区域人工林未来生产力的最佳策略。
