Wednesday, 9 November 2005
5

Evaluation of Maize Hybrids for Resistance to the Stubby-Root Nematode.

Matthew Krakowsky and Patricia Timper. USDA-ARS Tifton, GA, PO Box 748, Tifton, GA 31793

In the southern Coastal Plain, stubby-root nematode (SRN; Paratrichodorus minor) is the most widespread and damaging nematode parasite of corn. Currently, there is no known source of resistance in corn to this nematode. Our objective was to evaluate commercial maize hybrids for resistance to the stubby-root nematode. In three separate experiments, twenty-two commercial maize hybrids adapted to the southern Coastal Plain were planted in sterilized soil (five replicate pots per hybrid) and inoculated with 500 SRN approximately two weeks after planting. Nematodes were extracted from soil 50 days after inoculation. Considerable variation in nematode reproduction was observed among the hybrids, with nematode reproduction on the most resistant hybrids at less than 20% of that of the most susceptible hybrids. This data suggests that resistance to SRN is present in commercial maize hybrids and that, following validation of these results with field experiments, recommendations can be made to farmers concerning hybrids best suited for planting in fields with recurring SRN populations.

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