Journal of Nematology (2007) 39, p. 104 (MacGuidwin et al.)

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A.E. MacGuidwin and D.L. Knuteson (2007)
Using biointensive practices to manage two interacting pathogens
Journal of Nematology 39 (1), 104-104
Abstract - Society of Nematologists 46th Annual Meeting San Diego, California July 28-August 1, 2007
Abstract: Verticillium dahliae (Vd) and Pratylenchus penetrans (Pp) interact to cause the potato early dying disease (PED). We tested biointensive practices of cover crop green manures and solarization to manage both pathogens in two commercial fields. Cover crops reported to suppress Vd (sorghum-sudangrass (ss), corn and rapeseed) or Pp (forage pearl millet (fpm) and marigold) were planted in a split-plot experiment with solarization (+/-) as the subplot. Solarized plots were covered with clear polyethylene film after green manure incorporation. Metam sodium was applied adjacent to the study sites in October, and potato was planted in year two. Solarized plots had lower inoculum densities of Pp and Vd when potatoes were planted and increased yield. There was a significant main effect of cover crop at planting for experiment two, with fpm and marigold superior to the other crops for nematode suppression. Plots that had been planted with fpm the year before also had a lower incidence of Vd in potato stems. Cover crops were significant for yield in the absence of solarization in experiment two, and yields were greater following fpm and millet than the other cover crops. Samples collected from fumigated areas were similar to solarization and marigold and fpm cover crops for most measures. These results demonstrate the importance of using strategies aimed at both root lesion nematodes and Verticillium in fields with high potential for PED.

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

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Verticillium dahliae Potato (Solanum tuberosum)
Pratylenchus penetrans Potato (Solanum tuberosum)