We bought our house last summer, and have spent a lot of time cleaning up the neglected lawn. In the process of weeding, dethatching, and topdressing, we discovered we have a lot of grubs living in our soil. As a result of all these grubs we have a lot of creatures digging up our yard to get to them. I've been told the timing and type of pesticide is somewhat critical to getting rid of these pests, so I wanted to reach out to find out what kind of pesticide to use, and when is the best time to apply it. Also, if there are any more natural alternatives I am very open to hearing about them. Thanks in advance for your help in rehabilitating my yard! -Randall
Baltimore County Maryland
Grubs are often found in lawns and are often not of concern unless their numbers get high. The recommended lawn in our area is turf-type tall fescue, and 8-15 per square foot is considered high.
See our page on grubs here: http://extension.umd.edu/hgic/topics/grubs-lawns
Otherwise, don't be too concerned. They often get blamed for lawn problems that can actually be traced to something else, like perennial grassy weeds going dormant.
Pesticides used on lawns often wipe out all kinds of insect life, including beneficials that help control other pests. Less use is better.
As far as treatment if it is needed, the person who gave you that information is behind. The best control for grubs if actually needed is a newer active ingredient called chlorantraniliprole (Accelepryn). That has a long application window and is relatively non-toxic.
Our lawn pages should be helpful to you. As we said, turf-type tall fescue is the recommended type of grass in sunny areas. Back in the day other grass varieties were used, and those were the ones that had more pest problems and problems like thatch.
See here: http://extension.umd.edu/hgic/topics/lawns