If root-knot nematodes are present in a turf system, which control measure is commonly employed?

• A. Broadleaf herbicide
• B. Nematicides
• C. Systemic fungicide
• D. Insect growth regulator

Answer: (B)

Root-knot nematodes are soil-borne pests that invade turf roots, causing galls and reduced root function, which weakens the turf. The best way to address this specific problem in a turf system is to use nematicides—pesticides labeled to control nematodes in the root zone. These products target the nematodes directly, helping protect root health and improve water and nutrient uptake. Broadleaf herbicides kill broadleaf weeds, systemic fungicides target fungi, and insect growth regulators affect insects, not nematodes, so they don’t address this pest. If nematicides are used, follow label directions and combine with cultural practices like proper irrigation, soil management, and choosing tolerant or resistant varieties to reduce nematode pressure.