Survey of Meloidogyne spp. in Tomato Production Fields of Baix Llobregat County, Spain.

A survey was conducted to determine the frequency and abundance of Meloidogyne spp. in tomato production sites located in Baix Llobregat County, Barcelona, Spain. Forty-five sites were sampled before planting and at harvest from February to October, 1991. Meloidogyne spp. occurred in 49% of the sites sampled. Preplant population densities ranged from 10 to 220 (x = 110)juveniles/ 250 cm(3) soil, and final population densities ranged from 20 to 1,530 (x = 410)juveniles/250 cm(3) soil. Final population densities were higher in open fields than in field greenhouses, but initial population densities were higher in greenhouses than in fields. Meloidogyne incognita, M. javanica, and M. arenaria were found in this survey. Meloidogyne populations that reproduced on M. incognita-resistant tomato cultivars in the field sites did not circumvent the Mi gene resistance in greenhouse tests.