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


  • S. R. Koenning
  • K. R. Barker


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.