Body color ranges from red to brown. White grub phase of the japanese beetle life cycle is very destructive to turf grasses. Japanese Beetle Grub Control - Blue Grass Lawn Care Landscaping Service The colorful, gleaming beetles start their life as white grubs living in the ground before emerging to wreak havoc on garden plants. Japanese beetle life cycle pictures . James kalisch, university of 1⅛ inches (25 to 28 mm) long (figure 5), causes the most nebraska) figures 2 and 3. Japanese beetles cause leaves to appear skeletonized. After the egg hatches in summer, the grub feeds on roots until the following summer when it emerges as a shiny beetle. White grub species japanese beetle masked chafer may or june beetle green june beetle black turfgrass ataenius others • can be identified using the raster pattern. Can clear an entire fruit tree in 15 minutes in a swarm. Adults feed on the foliage and fruits of several hundred species of fruit trees, ornamental trees. Ther...