June is the month for emergence of the adult stage of the worst insect pest of turfgrass, the appropriately named June beetle. With the rains this past week, lots of night flying June beetles have been flying around lights and windows, and we can expect to see that continue over the next few weeks.
June beetles typically emerge over several weeks beginning in late May and sometimes extending into July and August. Adult beetles lay the eggs that will eventually become white grubs, a pest of turfgrasses all across Texas. Eggs take up to two weeks to develop, and another three weeks is required for the most damaging and difficult to control stage to be reached. The best time for chemical suppression of white grubs usually occurs in Wise County during July and early August. Damage may not be visible until late fall when it is too late for control measures.
White grub damage can be detected by the presence of irregular shaped areas of weakened or dying grass in your lawn.
Several non-chemical treatments are available, including beneficial nematodes. These microscopic worms can be purchased from stores or through garden supply catalogs.
The most effective insecticides for controlling grubs contain imidacloprid. Trade names of products available include: Merit, Bayer Advanced Lawn Season Long Grub Control and Scotts Grub-Ex. This is only a partial list. If you would like more information on white grub control in your lawn, call the Extension office at (940) 627-3341.