The white silky tubes hide these worms during the day and in just a matter of a few days an infestation of sod webworms can kill off an entire lawn. Apply an insecticide containing diazinon, chlorpyrifos or isofenophos when you first notice the damage in your lawn, after carefully raking out all dead grass and mowing the area thoroughly. Applying insecticide in the evening hours is most effective as that is when the worms and moths are most active. After treatment avoid cutting or mowing the lawn for 3 to 5 days. Treat the lawn regularly every 2 months until early summer to kill off all eggs and emerging worms.
Treated lawns recover rapidly.
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