Temperature Effects on Reproduction and Pathogenicity of Pratylenchus coffeae and P. brachyurus and Survival of P. coffeae in Roots of Citrus jambhiri

  • J. D. Radewald
  • J. H. O'Bannon
  • A. T. Tomerlin


Optimum temperature for reproduction of Pratylenchus cof]eae on Rough lemon, Citrus jambhiri Lush. was 29.5 C. Pratylenchus coJfeae populations reached 7653 per g of root 2 months after initial inoculation with 140 nematodes. Maximum plant weight reduction was 38%; root weights were reduced by as much as 47%. Pratylenchus brachyurus significantly reduced plant and root weights but population sizes never approached those of P. coffeae. Pratylenchus coffeae survived in stored excised roots and were still infective after 4 months at temperatures ranging from 4.5 to 32 C. Key Words: Constant temperatures, Storage survival, Recovery.