Diagnosing nematode problems can be challenging because their symptoms often resemble other common plant stresses, such as drought, nutrient deficiencies, or disease.

Above-ground symptoms of plant-parasitic nematodes may include:

• Yellowing or chlorosis
• Stunted or uneven growth
• Wilting despite adequate moisture
• Thinning or poor stand establishment

Below-ground symptoms are often more telling and can include:

• Stunted or poorly developed root systems
• Deformed or swollen roots
• Darkened, rotted roots or root lesions
• Galls or knots, particularly with root-knot nematodes

Because these symptoms are not unique to nematodes, visual observation alone is not enough to make a diagnosis. A nematode assay is required to confirm their presence and identify the species involved. The UF/IFAS Nematode Assay Laboratory offers diagnostic testing services for those who suspect nematodes may be contributing to plant health issues.