Beetles have been seen flying in the landscape over the past week. It is this time of the year that they mate and lay their eggs which will turn to their larvae stage (white grubs) by early fall.
In the Northeast, there are four species of grubs that cause problems in turf: European chafer, Asiatic garden beetle, oriental beetle, and the Japanese beetle. Interestingly, I’ve seen fewer and fewer Japanese beetles over the last several years. Not sure if that’s due to less attractor plants in the neighborhood or if their numbers are actually in decline. This year I have seen a number of oriental beetles and asiatic garden beetles, both of which are night fliers.
With all the beetles flying amongst our landscape, clients often ask if pheromone traps are effective at lowering adult beetle infestations. My response is only if you can get a neighbor to put a trap in their yard and thus let the neighbor’s plants bear the brunt of increased injury and increased likelihood of greater number of eggs (which bercome grubs) being deposited in the soil of their lawn.