White Grubs...it is that time of year. Starting in late August, I get quite a few calls from a variety of people wondering what in the world is happening in their home lawns.
9 times out of 10, the issue is white grubs. So, here is what happens:
Starting June 1st in Highlands, mating season for Japanese Beatles and other species commences. In June and early July, these adult Beatles are laying eggs in the turf. You have probably seen them before in clusters all over the surface. The eggs hatch in late summer into the larval stage. During this stage of their life, the grubs feed on the roots of the turf. If we are in a rainy period, you won't see much damage because the excess water is plant available. However, when it turns dry, the turf will wilt (see photo above) due to a compromised root system. The larva will pupate to an adult, overwinter and thus starts the vicious cycle.
Fortunately, the control of grubs is quite easy. A chemical application in early June will prevent egg hatch. If one misses the preventative application, there are insecticides that can be used to kill the grubs in the fall. However, it is often too late as the turf roots are already compromised. In addition to wilt, many animals like skunks, raccoons and even bear seek these guys out. The damage is tremendous as they tear up the turf looking for, and eating grubs!