Management and Quantification of Plant Parasitic Nematodes on Carrots (Daucus carota subsp. sativus) in Muck Soils in Ontario

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Van Dyk, Dennis
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University of Guelph

Plant parasitic nematodes are a significant constraint on carrot production in Ontario, Canada. Growers need new tools to control the primary nematodes impacting carrots in the muck soil growing regions of Ontario, Meloidogyne hapla and Heterodera carotae. Growth room, microplot and field trials were conducted to evaluate new nematicides (abamectin, oleoresin of capsicum + AITC, spirotetramat, mustard seed meal, fluensulfone) and currently registered fumigants (chloropicrin, metam sodium, dazomet) for their efficacy against plant parasitic nematodes. Abamectin and fluensulfone decreased nematode damage in growth room trials. Chloropicrin and metam sodium provided the most consistent control and increased yields in field conditions. Nematode extraction methods were also evaluated to determine their efficacy at extracting plant parasitic nematodes relevant to carrots. The SC method was found to be effective at extracting more Heterodera spp. but not Meloidogyne spp. This research provides strategies to better manage plant parasitic nematodes in carrots produced in Ontario.

nematode, carrot, plant parasitic nematodes, fumigants, fumigation, nematicides, non-fumigant nematicides, nematode extraction, nematode extraction methods, soil nematodes, soil nematode extraction, sugar centrifugation, baermann pan, baermann funnel, chloropicrin, metam sodium, fluensulfone, carrot cyst nematode, root knot nematode, meloidogyne hapla, heterodera carotae