Preventative Grub Control applications should be applied around late May-late June in Kansas. There are two major species of White Grubs in Kansas. The first and most important is the Southern Masked Chafer (See picture). The second is the May Beetle, also known as the June Beetle. Southern Masked Chafer usually do more damage than the May Beetle due to greater #'s produced. All Lawns should be treated with Merit (Imidacloprid). Merit works by interfering with the transmission of nerve impulses in insects and has a low toxicity rating for humans. Most of these products can be purchased impregnated onto fertilizer, thus providing your summer fertilizer in the same application.