ISHS Acta Horticulturae 762: XXVII International Horticultural Congress - IHC2006: International Symposium on Horticultural Plants in Urban and Peri-Urban Life
VARIABILITY IN POPULATIONS OF PLANT PARASITIC NEMATODES ON TURFGRASS |
| Authors: | B.B. Westerdahl, M.A. Harivandi |
| Keywords: | golf green, nematodes, Poa annua |
| Abstract:
Two sites were selected, one in San Mateo County, California, USA (Site A) and one in Monterey County, California, USA (Site B) to repeatedly sample populations of three plant-parasitic nematodes: root-knot (Meloiodogyne sp., Goeldi, Tylenchida, Heteroderidae), ring (Mesocriconema sp., Hofmänner and Manzel, Tylenchida, Criconematidae) and spiral (Helicotylenchus sp., Steiner, Tylenchida, Hoplolaimidae) on turfgrass (Poa annua L.). Three samples were taken biweekly for 12 months from each location. Nematodes were extracted from soil around roots, were identified to genus and counted under a dissecting microscope. Populations of all three nematodes were variable during the year. Levels of spiral nematode were similar at both locations. Populations were highest at Site A in mid-August and at Site B in early November and these populations were significantly higher than when populations were at their lowest levels. Ring nematode populations were considerably higher at Site A than at Site B. Populations at Site A were highest in September and at Site B in November and these populations were higher than when populations were at their lowest levels. As with ring nematode, populations of root-knot nematode were typically higher at Site A than at Site B. At Site A, populations in April and September were higher than at the lowest times of the year. Peak populations at Site B were reached in September and in November. Knowing that populations are variable will aid in evaluating nematode problems. | |
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