Coffea arabica CVS. Caturra and Catuai Nonhosts to a California Isolate of Melodogyne javanica

Abstract

Root penetration, nematode egress from roots, development, and reproduction of a California Meloidogyne javanica isolate on Coffea arabica cvs. Caturra and Catuai was assessed. Tomato, Lycopersicon esculentum, was included as a susceptible control. All experiments were conducted either in growth chambers at 25$^¿circ$ C or in a lath house at approximately 22-28 C. Plants were inoculated with M. javanica second-stage juveniles (J2) and at 10, 40, or 90 days after inoculation, data on plant growth were recorded, and nematodes in roots counted after staining or extraction by mist chamber or Baermann funnel. Caturra and Catuai were nonhosts to the California isolate of M. javanica. Nematode penetration of Caturra and Catuai roots was very low 10 days after plants were inoculated with J2. Less than 2% of the initial inoculum (Pi) entered coffee roots, but 9 to 58% of the initial inoculum penetrated tomato roots. Very few J2 were observed in the Caturra and Catuai roots over an 8-day perio