Relative Tolerance of Selected Soybean Cultivars to Hoplolaimus columbus and Possible Effects of Soil Temperature

A. P. Nyczepir, S. A. Lewis

Abstract


Eleven soybean [Glycine max (L.) Merr.] cultivars resistant to one or more plant-parasitic nematodes, and one resistant to the Mexican bean beetle (Epilachna varivestis Muls.), were tested for susceptibility to Hoplolaimus columbus. All cultivars were parasitized, but nematode reproduction varied. 'Pickett-71' was the most susceptible host among the cultivars tested. 'Dyer' and three 'P.I. cultivars' were most tolerant when yield /plant and total yield were compared for fumigated and unfumigated plots, even though their yield potential was low. 'Hardee,' 'Coker 4504,' 'W-4,' 'D71-9257,' and 'ED-371' appeared tolerant throughout the growing season and yielded well in unfumigated soil. Infection and reproduction of H. columbus in 'Forrest' soybean roots were greater at 30 ± 1 C than at 20 or 25 ± 1 C. Plant height and root weight varied with the soil treatments. Key Words: tolerant, reproduction, infectivity, ecology.

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