They become inactive when soil temperatures fall below 50F. They have a substantially shorter shelf life than standard grub control products. Who would have ever thought that those little creatures could do so much damage in only a few short weeks? In one year the Minnesota Department of Agriculture (MDA) trapped more than one million beetles. Norway and Japanese maple, birch, crabapple, purple-leaf plum, rose, mountain ash, and linden are highly preferred ornamental hosts. They usually arrive mid to late June and stay through mid to late August. Japanese beetles occur in every state east of the Mississippi River except Florida. The Japanese beetle is destroying plants across Windsor Essex. Products containing dinotefuran, trichlorfon or clothianidin work best when Japanese beetle grubs are in the first and second instars (August through first week of September). In the spring, when soil temperatures reach 50F, the grubs begin to move up into the root-zone to resume feeding for about three to five weeks. Commercially available products containing strains of S. carpocapsae have been marginally effective. A: Japanese beetles are scarab beetles, a family of beetles that tends to appear in early June and last a couple months. Item number: XHT1062. Revised: 6/14/2013 However, unlike the bowl-cut Beatles who gave us songs like “Mother Nature’s Son” and “Yesterday,” these beetles were an unwelcome addition to the area. For technical support please contact the CFAES Helpdesk. Japanese beetles have been around for 10 years. The eggs then develop into white grubs that have brown heads, 6 legs, and reaching sizes of up to ¾ inch in length. Products that contain chlorantraniliprole can be applied from early April through July to control Japanese beetle grubs that start feeding in mid-July to late July. The MDA maintains an updated distribution map of Japanese beetles. If you have a disability and experience difficulty accessing this content request accommodation here. All I know is they have been around every year for as long as I can remember. The insect thrives in hot sunny summer weather so this year has been particularly good for the beetle but bad for farmers and gardeners. Grub Control-The best time of year to control Japanese beetles … All can be called “June bugs,” but each species is different and causes different degrees of damage. The threat of the red flour beetle invading from an outside food source, such as grain spillage, must therefore be considered. “Eight” works better than “Sevin.” Physical removal and trapping of adults: Removing beetles by hand, or trapping, may provide adequate protection for small plantings when beetle numbers are low. Often the upper canopy is defoliated first or most severely. Immediately thereafter, females mate with males and begin laying eggs. College of Food, Agricultural, and Environmental Sciences As a result, they reduce a plant’s ability to take up enough water and nutrients to withstand stresses of hot, dry weather. They seem to prefer Kentucky bluegrass, perennial ryegrass, tall fescues and bentgrass. This fact sheet is a revision of HYG-2504-91, "Japanese Beetle," by David J. Shetlar. We’ve talked about this a little on the Forums, in a thread about moles (who love the grubs that become the beetles…one big chain of garden havoc). The grubs grow quickly, and by late-August are nearly full-grown (about one inch long). By mid August, she’ll lay a … You can plan on about 6 to 7 weeks for Japanese Beetles to be in your garden and eating the leaves off your trees. Several insecticides have residues that can remain active for weeks to months in the soil-thatch interface. Immediately thereafter, females mate with males and begin laying eggs. 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