Sod webworms are lawn pests that can cause significant damage to turfgrass. These insects feed on grass blades and stems, which can result in yellowing areas or dead patches in the lawn.
The adult sod webworm is a small moth measuring about 1 cm in length. During the day, the moth typically hides within the lawn or surrounding vegetation. Adults are most active at night during warm evenings, particularly in late May and early June.
During this time, the moths lay their eggs directly on the lawn. After the eggs hatch, small caterpillars emerge and begin feeding on the grass.
The caterpillars feed primarily at night, attacking the base and stems of the grass. During the day, they hide within the thatch layer of the lawn, where they remain protected.
As the season progresses, the caterpillars continue to grow and reach their mature size by late September. They then overwinter within the thatch layer of the lawn.
The following spring, the caterpillars develop into pupae, then emerge as adult moths, restarting the life cycle and laying eggs again in late spring.
Damage caused by sod webworms is primarily due to the feeding activity of the caterpillars. This feeding can create yellow or dead patches in the lawn. When infestations are severe, these patches can expand and weaken large areas of turfgrass.
Proper lawn care practices - including balanced fertilization, soil aeration, and regular monitoring - help reduce the risk of infestation and maintain a lawn that is more resistant to insect damage.
What are sod webworms in lawns?
Sod webworms are lawn pests whose larvae (caterpillars) feed on turfgrass, often causing yellow or dead patches in the lawn.
How can I recognize a sod webworm infestation?
Common signs include:
- yellow or dead patches in the lawn;
- grass that pulls up easily;
- small caterpillars found within the thatch layer.
When do sod webworms appear?
Adult moths usually appear in late spring, particularly during warm evenings in May and June, when they lay eggs on lawns.
How can sod webworm damage be prevented?
To reduce the risk:
- maintain a dense and healthy lawn;
- aerate compacted soil;
- monitor for caterpillars;
- maintain proper lawn care practices.
Do you offer lawn pest control services in Quebec and Ontario?
Yes. Services Provert provides professional lawn care and insect control services throughout Quebec and southern Ontario, helping homeowners protect their lawns from damaging pests.
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