Why is lab analysis required to diagnose nematodes?

Why is lab analysis required to diagnose nematodes?

• A. Symptoms are vague and nematodes are microscopic.
• B. Nematodes are large and easy to see without analysis.
• C. Field signs are sufficient to identify nematodes.
• D. Nematodes do not occur in soil.

Answer: (A)

Nematodes are microscopic pests that live in soil, and the symptoms they cause on plants are often vague and resemble problems from other causes. Because they are so small and field symptoms aren’t specific, you can’t reliably diagnose nematode problems by sight alone. Lab analysis—collecting soil or root samples and extracting and identifying the nematodes—is needed to confirm their presence, determine which species is involved, and gauge population levels to guide treatment. That’s why the statement about needing lab work is correct: field signs aren’t enough to definitively identify nematodes, and nematodes are not large or visible to the naked eye. Also, nematodes do occur in soil, so the idea that they don’t is incorrect.

Nematodes are microscopic pests that live in soil, and the symptoms they cause on plants are often vague and resemble problems from other causes. Because they are so small and field symptoms aren’t specific, you can’t reliably diagnose nematode problems by sight alone. Lab analysis—collecting soil or root samples and extracting and identifying the nematodes—is needed to confirm their presence, determine which species is involved, and gauge population levels to guide treatment.

That’s why the statement about needing lab work is correct: field signs aren’t enough to definitively identify nematodes, and nematodes are not large or visible to the naked eye. Also, nematodes do occur in soil, so the idea that they don’t is incorrect.