Journal of Nematology (2005) 37, p. 378 (LaMondia)

J.A. LaMondia (2005)
The effect of lesion nematode management by rotation or green manure crops on potato early dying
Journal of Nematology 37 (3), 378-378
44th Annual Meeting, Society of Nematologists, Fort Lauderdale, Florida, 9-13 July, 2005
Abstract: The effects of green manure rotation crops on early dying of potato caused by Verticillium dahliae and Pratylenchus penetrans were evaluated in microplots. Superior potato, Dwarf Essex rapeseed, Saia oat, Haychow sorgho-sudangrass, Trudan 8 sudangrass, Piper sudangrass, Pearl millet 101, Rudbeckia hirta, Polynema marigold, or Gary oat were grown or a full season (2002) in 12 replicate plots and shoots were either removed or tilled into soil. Lesion nematodes were extracted from oat cover crop roots in the fall. In the following year (2003), potatoes were grown, leaves symptomatic of early dying were counted weekly and area under the disease progress curve (AUDPC) was determined. Tuber yield was measured from each microplot. Nematodes were again extracted from fall oat cover crop roots. All of the rotation crops except Gary oat resulted in lower fall 2002 lesion nematode densities than potato. There were no differences in lesion nematode populations between plots in which shoots had been incorporated or removed. In the 2003 potato crop, after a single year of rotation, there were no differences in the AUDPC after different rotation crops, perhaps due to rapid senescence of the crop under wet conditions, but tuber yields were higher after Rudbeckia hirta, Pearl millet and Polynema marigold than for other rotation crops or continuous potato. Nematode recovery from the oat cover crop following potatoes in 2003 was greatest after oat, rapeseed, Trudan 8 sudangrass, and potato. Populations were still reduced after previous rotation to R. hirta, Polynema marigold, Pearl millet, Piper sudan, and Haychow sorgho-sudangrass. These data indicate that a single year of rotation can reduce P. penetrans populations and may aid in management of potato early dying.
Database assignments for author(s): James A. LaMondia

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Verticillium dahliae	Potato (Solanum tuberosum)
	Pratylenchus penetrans	Potato (Solanum tuberosum)