In addition to the increasing temperatures another threat to your lawn are insects such as Japanese beetles and other grub. Japanese beetles and other grub can wreak havoc in a garden by feeding on the leaves of a number of different plants, skeletonizing the leaves and eventually defoliating the plants. While an individual Japanese beetle doesn’t do that much damage while feeding on a plant, they tend to assemble in great numbers and can easily defoliate shrubs and trees. They also cause damage to lawns by feeding on the roots of grass. The only way to protect your lawn and plants is to have preventative insecticide applied.