Question
Hi,
We have about 2 dozen dead patches on the front lawn. They've spread over a 2 or 3 year period of time. In the spring we put down Grub X thinking we had grubs. So far the patches haven't spread this season, but no new grass has started to grow either. Can we scratch the grass & plant grass seed, & is is safe after putting down the Grub X. Also I mowed yesterday & all these little white moths flew out of the lawn. HELP !!!!

Answer
Hi Terri,

It sounds like you could have Sod Webworms.  These are the caterpillar form of the moths you witnessed.

The damage caused by sod webworms may first appear in early spring. The damage shows up as small dead patches of grass among the normally growing grass. The summer generation may cause general turf thinning or even irregular dead patches in late June into early August. Sod webworms prefer sunny areas and the larvae are often found on south facing, steep slopes and banks, where it is hot and dry. Heavily shaded turf is seldom attacked by the larvae.

The most severe damage usually shows up in July and August when the temperature is hot and the grass is not growing vigorously. In fact, most sod webworm damage is mistaken for heat and drought stress. Sod webworm-damaged lawns may recover slowly, without irrigation and light fertilizations. These thin turf areas allow weeds to establish in the lawn making it unsightly.

Damage can often be outgrown if water is continually available. Considerable damage may occur if irrigation is not possible during periods of drought or close mowing is used.

You can also use pesticides to control them if you'd like, but Grub X typically is not very effective against them.  Since I don't know what's available in your state, I'd recommend checking with a local Lawn & Garden shop & asking for a product that is effective.  

You can DEFINITELY scratch and plant seed now.  In fact, it would be far better than waiting until the Spring.

Now that you know the issue, management should be much easier.  UI'd recommend reading up on the subject more to become familiar with this particular pest.

Good luck!

C.J. Brown
www.TheLawnCoach.com