Document Type



The Kalsow Prairie is a 160 acre native tract located in the Clarion-Nicollet-Webster soil association in Pocahontas County, Iowa. It is composed of clay-loam to silty-clay-loam soil that ranged from pH 5.5 to 6.7, except for a soil drift that was 7.6, among the 15 test sites. The organic matter content was 8.5 to 12.9%. Population density changes of selected plant parasitic nematodes were investigated at four bimonthly intervals beginning in February 1968. The dominant nematodes in potholes were Helicotylenchus hydrophilus, Xiphinema chambersi, Tetylenchus;octus, and an undescribed Tylenchorhynchus species. The common nematodes in the drier sites were Tylenchorhynchus maximus, T. nudus, Xiphinema americanum and Helicotylenchus pseudorobustus. The total number of nematodes in a sample was generally highest in winter. Population densities in each subsequent sample decreased until the final sampling in late August and early September. Exceptions to this general trend were Helicotylenchus hydrophilus, Tetylenchus ;octus, Xiphinema americanum, and an undescribed species of Tylenchorhynchus which were not recovered at the winter sampling. Many species of nematodes were not found in great enough population densities to perceive any type of population pattern.

Publication Date

June 1973

Journal Title

Proceedings of the Iowa Academy of Science





First Page


Last Page



©1973 Iowa Academy of Science, Inc.



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