Embryogenesis and Postinfection Development of Meloidogyne konaensis


  • Fengru Zhang
  • D. P. Schmitt


The effects of temperature on embryogenesis and postinfection development in Meloidogyne konaensis were examined. Embryogenesis was evaluated at 5, 8, 10, 13, 16, 20, 22, 24, 26, 28, 30, 35, and 40 C. No embryonic development occurred at 5 C. Some development, although incomplete, occurred at 8 and 10 C. The rate of embryogenesis was linear from 13 to 30 C, but decreased at 35 C. The lowest egg mortality occurred at 24 C, whereas all eggs died within 24 hours at 40 C. Postinfection development was determined on coffee and tomato in a greenhouse at an average temperature of 30 C and in a growth chamber with a constant temperature of 26 C. Development of M. konaensis J2 to mature female required 38 and 48 days on coffee at 30 and 26 C, respectively. This process took 20 and 26 days, respectively, on tomato. Key words: Coffee arabica, coffee, degree-days, embryogenesis, kona coffee root-knot nematode, life-history, life-cycle, Lycopersicon esculentum, M. konaensis, nematode, postinfection development, root-knot, tomato.