Susceptibility of Pigeon Pea (Cajanus cajan) Cultivars and Lines to Meloidogyne javanica


  • Nelia Acosta
  • N. Vicente
  • J. Toro


Resistance, Root-Knot Nematodes, Histopathology


Greenhouse and field tests were conducted to determine the susceptibility of various pigeon pea cultivars and lines developed in Puerto Rico to a population of Meloidogyne javanica from Coamo, Puerto Rico. In the first greenhouse test, shoot dry weights and number of bacterial nodules fron inoculated plants were significantly higher than from noninoculated plants. Gall indices of 5 on a 0-5 rating scale were found in all cultivars and lines evaluated. The cultivar Blanco was the tallest entry, had the highest shoot and root dry weights, and the second highest number of M. javanica eggs and second-stage juveniles recovered from the roots. The same cultivar showed the highest number of bacterial nodules in inoculated plants. The 8 pigeon pea cultivars and lines tested in a second greenhouse experiment were also susceptible to the M. javanica population. Dry weight in noninoculated plants was significantly higher than in inoculated. Highest nematode populations were recorded from line 9