Extension Plant Pathology at the University of Arizona

Diseases of carrot ( Daucus carota ) in Arizona

Root-knot nematode

Root-knot nematode is caused by the plant parasitic nematode, Meloidogyne incognita. The nematode larvae feed on roots causing the swellings or knots that are characteristic of root-knot infection. Roots are often stunted and deformed (photo 1). 

Carrots are very susceptible to root-knot and should never be planted in infested soils. Fields can be fumigated  with Telone or metam sodium (Vapam) to control disease. Small acreages or gardens can be amended with compost and solarized to reduce the number of parasitic nematodes in the soil.

More information on control strategies and solarization can be obtained from: http://cals.arizona.edu/yavapai/anr/hort/byg/archive/soilsolarization.html
http://edis.ifas.ufl.edu/pdffiles/CV/CV11200.pdf

 

1 carrot root deformed by root-knot nematode feeding

Diseases of carrot | Plant Disease Identification | Extension Plant Pathology

February 10, 2003


http://cals.arizona.edu/PLP/plpext/diseases/vegetables/carrot/carrknot.htm