Canadian Forest Service Publications
Corky root disease: population fluctuations of Xiphinema bakeri nematodes, and disease severity in forest nursery soil cropped with different seedling species. 1975. Sutherland, J.R.; Sluggett, L.J. Canadian Journal of Forest Research 5(1): 97-104.
Issued by: Pacific Forestry Centre
Catalog ID: 1545
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Buildup and fluctuations of Xiphinemabakeri Williams nematode populations and disease severity were determined in seedbeds of Sitka (Piceasitchensis (Bong.) Carr.), and white (P. glauca (Moench) Voss) spruces and western hemlock (Tsugaheterophylla (Raf.) Sarg.) and Douglas-fir(Pseudotsugamenziesii (Mirb.) Franco). Population levels were the same on spruces and hemlock, and on coastal and interior forms of Douglas-fir. Numbers of total and female nematodes, and gravid females peaked in September, and May to June, respectively, then declined in late winter and early spring. No post-oviposition increase occurred in early developmental stage nematodes and the nematode overwintered primarily as eggs and juveniles. Total and gravid female population peaks correlated positively with higher ambient temperatures, and the September peak in total nematode numbers coincided with new root-growth of Douglas-fir. Soil moisture had no direct effect on nematode populations. Root disease severity of all seedling species was related to numbers of nematodes per seedling root system throughout the first and second growing seasons, but soil nematode populations for previous and current sampling dates were not correlated with current disease severity. A negative correlation was obtained between nematode numbers per cubic centimetre of root and shoot growth of Douglas-fir.