Settle D M, Fry J D, Todd T C, Tisserat N A
Department of Plant Pathology.
Department of Horticulture and Recreation Resources.
Plant Dis. 2006 Jan;90(1):44-50. doi: 10.1094/PD-90-0044.
The effects of management practices and nematode population density on the seasonal fluctuationsin lance nematode (Hoplolaimus galeatus) populations in creeping bentgrass were studiedin a naturally infested experimental putting green and in artificially infested microplots. In general, H. galeatus populations increased from late spring through midsummer, declined in August, and increased again in the fall. Population increase in microplots was strongly density dependent, with final population densities inversely proportional to inoculum levels. Ectoparasitic populationsof H. galeatus in both studies were composed of adults and juveniles, whereas endoparasiticpopulations were almost exclusively juveniles. H. galeatus populations in the naturallyinfested site were aggregated spatially, but the aggregation was not temporally stable. Nematodepopulations were not affected by bentgrass cultivar selection or irrigation frequency.
在一个自然感染的实验果岭和人工感染的微小区中，研究了管理措施和线虫种群密度对匍匐翦股颖上长矛线虫（Hoplolaimus galeatus）种群季节性波动的影响。总体而言，H. galeatus种群数量从春末到仲夏增加，8月下降，秋季再次增加。微小区中的种群增长强烈依赖于密度，最终种群密度与接种水平成反比。在两项研究中，H. galeatus的外寄生种群由成虫和幼虫组成，而内寄生种群几乎完全是幼虫。自然感染地点的H. galeatus种群在空间上呈聚集分布，但这种聚集在时间上并不稳定。线虫种群不受翦股颖品种选择或灌溉频率的影响。
