University of Florida

Root Knot


Meloidogyne spp.




Roots develop galls on main and lateral roots due to cortical cell proliferation; gall size variable from pinhead size to one inch or larger; roots generally limited with few feeder roots; plants appear stunted and chlorotic, wilting under moisture stress conditions.

Pathogen Spread

Infested soil moved by machinery, infected transplants, surface water or irrigation; survives in soil and root debris.

Favorable Conditions

Sandy soil types where any one of numerous weed and crop hosts are grown. Severity highest in hot fall, late spring crops.

Root Knot Nematode Picture

Root knot nematode
Image # 113.
Root knot nematode
root galling quite evident with reduced secondary root formation.