Relative Damage Functions and Reproductive Potentials of Meloidogyne arenaria and M. hapla on Peanut

S. R. Koenning, K. R. Barker

Abstract


The reproductive potential and damage functions for Meloidogyne hapla and M. arenaria race 1 on Virginia-type peanuts (Arachis hypogaea cv. Florigiant) were determined over 2 years in microplot experiments in North Carolina. Peanut yield suppression and damage to pods as a result of galling were greatest in response to M. arenaria (P = 0.01). Damage functions for the two species were adequately described by the quadratic models: yield (g/plot) = 398 - 17.1 (log[sub1][sub0][Pi + 1]) - 17.0(log[sub1][sub0][Pi + 1])²; (R² = 0.83, P = 0.0001) for M. arenaria; and yield = 388 - 10.2(log[sub1][sub0][Pi + 1]) - 7.5(log[sub1][sub0][Pi + 1])², (R² = 0.30, P = 0.0001) for M. hapla. Both species caused galling on pods, but this was more severe in response to M. arenaria. Reproduction of M. arenaria race 1 was greater than M. hapla on peanut, which accounts in part for the more severe pod galling. Peanut was an excellent host for both M. arenaria race 1 and for M. hapla, but reproduction by M. hapla was more variable. Key words: Arachis hypogaea, damage function, Meloidogyne arenaria, Meloidogyne hapla, nematode, peanut, reproductive potential, root-knot nematode.

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