Interaction between Meloidogyne arenaria and M. incognita on tobacco

Meloidogyne arenaria race 2 at infestation levels of 6,000 and 10,000 eggs per plant produced great numbers of galls and egg masses on NC95 tobacco roots in the greenhouse, whereas M. incognita race 1 at infestation levels up to 20,000 eggs per plant induced no galls or egg masses on NC95 tobacco roots. Females of M. incognita were observed in tobacco roots inoculated with a mixture of M. arena ria plus M. incognita. The maximum number of M. incognita females occurred when both nematode species were inoculated simultaneously while fewer were noted when M. arenaria was inoculated first followed by M. incognita 1 or 2 weeks later.