About Sod Spray

Herbicides Before Weeds Appear

• Pre-emergence herbicides control weeds before they appear or germinate and are applied to established sod grasses. They are effective in preventing weed germination but should not be applied before sod is laid down. Spray these herbicides across the lawn evenly, ensuring a barrier on the soil surface. Any skipped areas may later see emerged weeds. Prodiamine provides effective control of goose grass and barnyard grass. Oxadiazon controls crab grass foxtail and field sandbur.

Herbicides After Weeds Appear

• MSMA (monosodium methanearsonate) is a popular herbicidal spray for emerged weeds such as crab grass. This and many other herbicides should only be applied once sod is established. Provide plenty of water before application. The spray may cause a temporary discoloration of the turf.

  Before laying sod, it is beneficial to completely eradicate weeds from the area. This is especially important for certain grasses, such as Bermuda grass. If wild grasses or weeds are present, they should be removed as well to allow the sod to develop evenly. At least one week before laying sod, spray on top of weeds directly with an all-purpose herbicide containing glyphosate to eliminate their growth. Read the label to make sure the residual period following the application will not interfere with your sod.

Other Sod Sprays

• Insects are generally not a major threat to sod, but a few pests can cause blade damage when present in large numbers. Sod webworms are often found in sunny lawns and golf courses. The immature larval form of the moth consumes grass blades and creates large patches of brown, damaged grass, particularly in July and August. To combat these pests, use approved, domestic liquid pesticide sprays such as those containing halofenozid, cyfluthrin or azadirachti.

Fertilizer Sprays

• When first establishing sod, use a fertilizer spray that is high in phosphorous and low in nitrogen and potassium to promote root growth. Water lightly during establishment and do not spray with too much force, as it could disturb establishment. Once grass is rooted (about four weeks after planting), switch to a lawn spray fertilizer containing nitrogen. Apply 1 lb. of nitrogen per 1,000 square feet.

  Some grasses, such as St. Augustine and centipede grass, are susceptible to iron deficiency and may start yellowing. Use sprays containing iron sulfate or iron chelate and apply directly to the grass to improve these symptoms.