Should the gardener insist on pesticides, plenty of choices are available. Its first use by the company in a consumer product was to control soil insects, chiefly grubs in lawns. The product is basically a lot of beneficial nematodes that control Japanese beetle and masked chafer beetle grubs. Generally, grubs aren't a good thing to have in the lawn because they eat the roots of grass plants. A lot of grubs feeding in the same area will kill the grass.
Nematodes are microscopic worms that exist in most soils.
As grub and nematodes make their way through the soil, the nematode works into the grub's body where it releases a bacteria that kills the grub within 48 hours. The nematodes stay behind and feed on the grub's body, reproducing to create another generation of 35,000 or more juvenile nematodes in each grub. The nematodes mature, then fan out to find more grubs. Some stop larvae from feeding, causing their death in a few days, while another kills pests by suffocating the insect and their eggs with an oil. Or you can cut that time down by using sod to get the desired look without worrying about empty patches of ground or sparse areas that did not get enough seed.