Description: A small transparent parasite that is visible only under a microscope.
Timing of damage: Mid-season but active throughout growing season
Type of damage: Plant stunting and yellowing and short, stubby roots.
Scouting: Lesion nematodes feed inside the roots, so root samples are necessary. Take samples at midseason and place in a plastic bag to send to a nematology lab. Be careful not to expose samples to high temperatures.
Economic threshold: When nematodes exceed 250 per 100 cubic cm of soil and 1 gram root tissue.