Nematodes are microscopic roundworms that live in soil and feed upon plant roots. They are the most numerous multi-cellular animals on the planet. Thousands of them can be present in one handful of soil. Plant parasitic nematodes can be extremely damaging to many crops resulting in poor growth, decreased yield, and root diseases. The above ground symptoms, of nematode root damage, are evidenced by water stress, poor or stunted growth, reduced foliage, leaf yellowing, and poor fruit or seed production. Click the link below to see more nematode information, including different crop thresholds.