Pecan Root-Knot Nematode
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Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
Reported only from South Africa and USA. In USA it is reported from
Texas, New Mexico, Arizona, Oklahoma and Florida, primarily on roots of pecan
Pecan tree seedlings are stressed and grow poorly. Seedlings have dead
shoots in canopy. Yield decline reported for mature trees in New Mexico.
Feeding site establishment and
development typical of genus.
Type Host: mpecan (Crya illinoensis)
Known hosts are pecan, Carya illinoensis, hickory and walnut trees
(Starr et al., 2006)..
Reported non-hosts include beans, peas, cowpea, tomato, peach and weeping
lovegrass (Marais and Heyns, 1990).
Female body ruptures root cortex and may protrude with the egg
mass on the root surface.
Both major roots and young roots have prominent galling. Seedlings
stressed with dead shoots (Brito et al., 2006)..
A two-year host free rotation is suggested for tree nurseries (Brito et al.
Host Plant Resistance, Non-hosts
Brito, J.A., R. Kaur, D.W. Dickson, J.R. Rich and L.A. Halsey. 2006. The
pecan root-knot nematode, Meloidogyne partityla Kleynhans, 1986.
Nematology Circular 222. Florida Dept Ag. and Cons. Serv.
Marais, M. and J. Heyns. 1990. Host plant tests with Meloidogyne partityla
Kleynhans, 1986. Phytophylactica 22:161-162.
Starr, J.L., E.K. Tomaszewski, M. Mundo-Ocampo and J.G. Baldwin, 1995.
Meloidogyne partityla on pecan: isozyme phenotypes and other hosts.
J. Nematology 28:565-568.