May/June beetles or “Junebugs” (Phyllophaga spp.) space beetles in the household Scarabaeidae. These indigenous insects are typical throughout Wisconsin and also can frequently be watched flying near lights or heard hitting home window screens on at an early stage summer evenings. Twenty-nine species of May/June beetles have actually been recorded in the state, although there are over 200 species known throughout phibìc America.

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Appearance: Adult May/June beetles are typically ½ come one inch long and vary in shade from reddish-brown to virtually black. Adult are active after dusk in late may

and early June and also are attracted to lamp at night. This insects space clumsy fliers and often collide v windows and cling come screens. Immature May/June beetles (i.e., larvae or “white grubs”) have actually distinctly C-shaped, cream-colored bodies v a reddish-brown head and three pairs of legs. Grubs deserve to be up to 1¼ inch long, and live in the soil making use of their strong mandibles (i.e., mouth parts) come chew on plant roots.

Life Cycle: every May/June beetles in Wisconsin have three-year life cycles (except because that the widely spread Phyllophaga tristis which has actually a two-year life cycle). Adults arise in late May and early June, and also are energetic in the evening hours. Adult mate, and females burrow into the floor to lay eggs. After flower from eggs, white grubs feed on tree roots. End the food of the following two years, larvae pass through three stages (called instars) coming to be larger and much more destructive through each stage. In the so late summer and fall that their 3rd year (or second year in the instance of Phyllophaga tristis), larvae start pupating in the soil. Adults arise the complying with spring. In a offered location, overlapping generations can happen so the adults will be existing every year. In part (but no all) locations, one of the overlapping generations have the right to be notably bigger than the others, leading to a huge adult population every three years.

Damage: May/June beetles are pests the turfgrass, ornamentals, Christmas trees, cranberries, and certain vegetable and also field crops. Adults have actually been documented to cause foliar damages to ornamental plants, such as oaks and other trees. This type of damage occurs infrequently and tends to be localized in the state. May/June beetle larvae (white grubs) tend to it is in the many damaging life stage of the insect. White grubs damage plants by feeding on your roots and disrupting the uptake and also transport the water and also nutrients. Initial symptoms of grub damage appear comparable to those of dryness stress consisting of yellowing and also wilting of foliage, and also stunting the plants. Grubs have the right to kill little plants, however tend to have actually less the an effect on bigger plants with larger, an ext robust source systems. Once high populaces of grubs occur in turfgrass, discolored job of loose rooted turf can appear in mid- to late-summer. Pets such as skunks, raccoons, turkeys and also sandhill cranes may dig and also forage because that grubs, bring about even an ext damage to the turf. Damages from adults and also white grubs have the right to occur everywhere in Wisconsin, yet is most typically found in the eastern and also northeastern parts of the state.

Management: since May/June beetle populaces tend to it is in localized, regulate is seldom warranted uneven there is a history of damages in one area. In places where damages from a large population has actually occurred, control may not be warranted every year due to the multi-year life bike of May/June beetles. Discovering the background of May/June beetle damages in her area and monitoring because that these insects deserve to go a long method towards predicting damage and also effectively managing this pest.

Maintaining tree health and also vigor through ideal irrigation, fertilization, and other techniques can aid minimize the results of damages from May/June beetles. Once chemical insecticides are warranted, a number of contact insecticides will control adult May/June beetles, including: carbaryl, cyfluthrin, lambda-cyhalothrin, and also others.

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If grubs room discovered, contact your neighborhood office come properly identify the insect, as other larvae (e.g., Japanese beetle) can happen in turf, ornamental, and also crop settings. Ideal identification is needed to most effectively manage pests! A variety of insecticides room labeled because that the manage of white grubs. Refer to the complying with University the Wisconsin Garden Facts and publications for product and timing recommendations: XHT1018 (Grub manage in residence Lawns), XHT1208 (White Grubs top top Christmas Trees), A3276 (Cranberry Pest administration in Wisconsin), A3646 (Pest administration in Wisconsin field Crops), and A3422 (Commercial Vegetable manufacturing in Wisconsin). Once targeting grubs v chemical insecticides, be sure to follow all label instructions, which might include applying approximately ¼ customs of water to assist move the assets into plant source zones.

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