Root Knot Nematode 1436024 LGPT

Root knot nematode

Description:  Worm-shaped parasite that is invisible to the naked eye

Timing of damage: When soil temperatures reach 60°F to 65°F and continue to develop as long as soil temperatures remain above 50°F

Type of damage: Plants will appear stunted, wilted or yellowed, or they will be dead. Roots of infected plants will appear swollen or knotted.

Scouting: Dig stunted plants from the edge of the infected area and check for root galls. Take a soil sample from the root zone and send it to a nematology lab; be sure to keep the soil in the shade to avoid high temperatures.

Economic threshold: Varies with soil type. Ask nematology lab or local Extension office for guidelines.

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