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Meloidogyne incognita Resistance in Soybean under Midwest Conditions

^a Dep. of Botany and Plant Pathology, Purdue Univ., West Lafayette, IN 47907-2054
^b Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-2054
^c Dep. of Botany and Plant Pathology, Purdue Univ., West Lafayette, IN 47907-2054. This manuscript is published with the Purdue University, Agricultural Research Program number 2006-17974

^* Corresponding author (westphal{at}purdue.edu).

Soybean cultivars of maturity groups II to IV were tested in the greenhouse for resistance to Meloidogyne incognita (Kofoid and White) Chitwood. Selected cultivars were tested in a field of sandy loam soil naturally infested with M. incognita and Heterodera glycines Ichinohe (2004) or in a silt loam soil artificially infested with M. incognita (2005). In 2004, H444NRR was resistant to M. incognita, but not to H. glycines; LS94-3207 and LNX97164-35-5 were resistant to both nematodes; Gateway 427, H444NRR, LNX97164-35-5, and SB4399CT were moderately resistant to M. incognita in greenhouse tests; HF9665-2-15 was resistant to M. incognita but highly susceptible to H. glycines. In 2005, LS94-3207, H444NRR, LNX97164-35-5, and Manokin were resistant to M. incognita. In microplots with two sandy loam soils, HF9665-2-15 exhibited tolerance to increasing inoculum levels of M. incognita. High-yielding soybean cultivars in maturity groups II to IV with resistance and tolerance to M. incognita were identified. Under field conditions, resistance to the more widespread nematode H. glycines, combined with resistance to M. incognita, is highly desirable to reduce the risk of yield reduction and to improve cropping sequences that include soybean.

Abbreviations: GH1–GH6, greenhouse experiments • MG, maturity group • OM, organic matter

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Received for publication April 7, 2007.