Reductions in citrus yields caused by nematode infestation may vary from 10 to 50%, according to nutritional and environmental conditions—particularly under different soil moisture and soil oxygen conditions—since some citrus plants achieve apparently normal growth even in the presence of nematodes. These studies indicate the possibility that differences in soil environmental conditions (texture, pH, moisture, diffusion rates, salinity, nutrient availability, and other factors) may have more influence on good growth and performance of citrus than nematode populations on the roots.