Effect of Meloidogyne incognita, M. hapla, and M. javanica on the Severity of Fusarium Wilt of Chrysanthemum.
Rooted cuttings of Chrysanthemum morifolium 'Yellow Delaware' (Fusarium-susceptible) and 'White Iceberg' (Fusarium-resistant) were greenhouse-grown in: (i) non-infested soil; (ii) soil infested with Fusarium oxysporum alone; (iii) soil infested with Meloidogyne incognita, M. javanica or M. hapla; and (iv) each nematode separately plus the fungus. All nematode species infected roots of both cultivars and caused characteristic root-knot symptoms but did not appreciably affect growth meassured by plant weight. Nematodes did not break Fusarium wilt resistance of 'White Iceberg'; however, wilt symptoms appeared earlier and were more severe among 'Yellow Delaware' plants inoculated with Meloidogyne javanica and F. oxysporum than with similar combinations of the fungus and M. incognita or M. hapla or with the fungus alone.
Johnson
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Littrell
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