Return to Diseases

Root-knot nematodes (Meloidogyne incognita, M. hapla) aboveground symptoms include stunting, uneven growth, and nutrient deficiencies. Numerous galls form on roots and tubers, which may range from tiny bumps to larger swellings. Necrotic spots may develop under the skin.

Root-knot nematode on potato.

(Photo: Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org)

Management:

• Manage weeds (potential alternative hosts)
• Rotate with non-host crops
• Avoid movement of infested soil to clean fields
• Nematicides and soil fumigants are generally not recommended due to their temporary effect, cost, regulations, and limited number of licensed commercial applicators available for small growers

Return to Diseases