Pathological Reaction of Crested Wheatgrass Cultivars to Four Meloidogyne chitwoodi Populations
Griffin, G.D.; Asay, K.H.
Journal of Nematology 21(4): 446-452
1989
ISSN/ISBN: 0022-300X PMID: 19287637 Document Number: 333670
M. chitwoodi populations from Tulelake, California; Ft. Hall, Idaho; Beryl, Utah; and Prosser, Washington, significantly reduced dry shoot weights of crested wheatgrass (Agropyron cristatum and A. desertorum) cultivars Hycrest, Fairway, and Nordan in experiments conducted in a greenhouse and growth chamber. Shoot growth depression, root galling and nematode reproduction indices were greatest on plants inoculated with 5000 eggs/plant. Nematode populations from Tulelake, Ft. Hall and Beryl significantly reduced the growth of the 3 grass cultivars at 15, 20, 25 and 30 degrees C; the greatest reductions occurred at 20 and 25 degrees C. There were significant differences in the virulence of the nematode populations at high (30 degrees C) and low (15 degrees C) soil temperatures. At 15 degrees C, plant growth was reduced more by the Beryl and Tulelake than by the Ft. Hall population; whereas at 30 degrees C, the Ft. Hall population was more virulent than the Beryl and Tulelake populations. Root galling and nematode reproduction were greater on plants inoculated with Beryl and Tulelake populations at 15 degrees C than on plants inoculated with the Ft. Hall population, while the Ft. Hall population had the most pronounced effects at 30 degrees C.