Grub will feed until the temperature begins to drop in autumn. If you want to attract wildlife to your yard, … Adults:May beetles are about 12 to 25 mm long. June Bug. Adult Japanese beetles (June bugs) typically lay eggs in lawns in June. Photograph by John L. Capinera, University of Florida. In late March and April, grubs move back up to the surface of the soil. Larvae:The length of the larvae varies from 20 to 45 mm. After about 18 days, the eggs hatch out and the newly hatched larvae spend the next nine months going through three stages of larval growth and finally emerge in the spring as a newly hatched June bug. Inoculating the soil with bacterial spores of Bacillus popilliae Dutky and Bacillus lentimorbus Dutky aids in reducing populations. After pupating, an adult emerge, and there you have your beetle. Figure 2. They grow exponentially and molt twice before moving on to the next stage of their life cycle. Grubs often feed into August, when they change into their second stage of growth. Larvae feed on plant roots, carrion, or dung, depending on the type of scarab. Learn which plants thrive in your Hardiness Zone with our new interactive map! Kendall/Hunt Publishing Co. Dubuque, Iowa. Meanwhile, the grubs or larvae that started life early in spring begin to emerge as lawn foraging beetles. Phyllophaga larvae and other larvae of the family Scarabaeidae are often referred to as white grubs, including larvae of the Japanese beetle (Popillia japonica Newman), annual white grubs (Cyclocephala spp. June bug larvae are small white grubs with brown heads. Like it? pp. Scarab beetles generally lay their eggs in the ground, in dung, or in other decomposing materials including carrion. Green June beetles can be found in the eastern part of the United States. Larvae: The length of the larvae varies from 20 to 45 mm. The time period to reach adulthood from the pupal stage varies dramatically among different types of beetles. Beneficial nematodes seek out and kill all stages of harmful soil-dwelling insects. Lawn grubs are a common pest of the home lawn. These are the most common in New England. During the larval portion of their life cycle, June bugs go through three separate instars, or stages. The egg, larva, and pupa life cycle stages develop underground and unless soil is removed or dug into, these life stages will not be seen. Immature Insects (Volume 2). The common life cycle of the more destructive and abundant of these beetles extends over three years. At the second instar larvae burrow into the soil. … Rolston LH, Barlow T. 1980. The European chafer beetle originated in continental Europe but is now an invasive species found in temperate climates in North America, where they are often called June bugs. (1998). The large grubs of the chafer feed on the roots of both wild and cultivated cool-latitude grasses, which has made them a critter-non-grata on North American lawns. Females can lay up to 75 eggs in their short adult life. pp. As adult beetles, we swarm in great numbers in early summer, usually at dark and are strongly attracted to lights.. What I eat: As a larva, I live underground and eat the roots of grasses and other plants. This results in drought susceptibility and the ability to easily pull the grass away from the soil surface. The pupa is usually white, faint yellow, or dark brown in color. White grubs and their allies: a study of North American scarabaeoid larvae. June bugs’ larvae are whitish, C-shaped grubs that live underground. Adults do not feed on turfgrasses; however, in their larval stage, they tunnel through the soil and feed on plant roots. Tashiro H. 1973. New York. Eggs hatch about three weeks later into young larvae that feed upon roots and decaying vegetation throughout the summer and, in autumn, migrate downward (to a depth of up to 1.5 meters) and remain inactive until the following spring. Lawn grubs are a common pest of the home lawn. Can the June bug insect be dealt with entirely naturally? Larva (Larval Stage) As with many beetles, lightning bug larvae look somewhat wormlike. White grub, Phyllophaga spp., infected with Cordyceps fungus. Larval June bugs feed in warm summers and under the soil during winter. During the spring, damage is more apparent than root damage during the fall. During the years of heavy May beetle infestation, deep-rooted legumes, such as alfalfa or clovers, should be planted. In late March and April, grubs move back up to the surface of the soil. Grub is a term used most often to refer to the larval stage of one of three beetle species: the European chafer, June beetle and Japanese beetle. Grubs are the larval stage of the European chafer, June beetle (June bug) and/or Japanese beetle. Photograph by Jim Kalisch, University of Nebraska-Lincoln. Some, such as the green June beetle, are more brightly colored. This is the stage that lets them molt from grubs to adult beetles. June bug larva stage The grubs will grow to about 40 mm (1.6 in) and are white with a brownish-black head and brown spiracles along the sides of the body. Insecticide control of a white grub. Grubs feed now for between four and six months. Larvae are white with a C-shaped body, brown head, and three pairs of legs. The next autumn the larvae again migrate deep into the soil to overwinter, returning near the soil surface the following spring to feed on plant roots until they are fully grown in late spring. Photograph by James Castner, University of Florida. 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