False Japanese Beetles. However, we’ve found that these tend to attract more beetles to your yard and do little to reduce the overall population. Japanese beetle adults are beginning to emerge in eastern Nebraska. You may already have some of those attractive plants though and want to know if you can keep them protected. Japanese beetle adults are beginning to emerge in eastern Nebraska. Some of their favorite food plants are roses, lindens, … Organically, you can simply pluck beetles from plants and put them in soapy water to kill them or place a fine mesh net over plants like roses. Family: Scarabaeidae. They will continue to emerge for the next few weeks. Japanese BeetlesBy Kathleen CueNebraska Extension Horticulture Educator. As a result, we don’t recommend them. Click any photo below to learn more about these species and what you can do to help. Despite their voracious appetite, there are some plants that the Japanese beetle doesn’t seem to care for. GrubEx (active ingredient: chlorantraniliprole; Scott’s Turf) applied in mid-June to mid-July can eliminate populations of young white grubs. Their distribution has been increasing in Nebraska the last few years and they are being seen in corn and soybeans more frequently (Figure 1), in addition to feeding on landscape trees and shrubs. Japanese beetles feed on a wide variety of flowers and crops (the adult beetles attack more than 300 different kinds of plants), but in terms of garden plants, they are especially common on roses, as well as beans, grapes, and raspberries. During this time females are also laying eggs in the soil which will hatch into turf damaging grubs. Leaf tissues will be skeletonized, only the vascular portions of the leaf are left behind in a doily-like pattern. This relatively new Nebraskan pest can vex many a gardener but luckily there are strategies to deal with it. Even within Lincoln, some sections of town have had problems for several years, while other areas haven’t seen them yet. Adults emerge from the ground and begin feeding on plants in June and July. Some areas of eastern Nebraska have been dealing with Japanese beetles for several years already, while others still haven’t seen their first beetle. In some cases people have mistaken the Japanese beetle for its look-alike, the false Japanese beetle or sand chafer, Strigoderma arboricola, which is a native Nebraska insect found across most of the state. If dealing with an advanced infestation later in the year, products like Bayer Advanced Complete Insect Killer for Soil and Turf (active ingredient: imidacloprid; Bayer) can control > 50% of the grubs. Location in Nebraska. Research indicates JB traps attract more beetles to the yard than those yards that have no traps, resulting in more damage to trees, roses and edible plants. Description. Their larvae, called white grubs, will also feed on a wide variety of plant roots including ornamental trees and shrubs, garden and truck crops, and turfgrasses. They chew grass roots, causing the turf to brown and die. Scarab beetle, similar to a June beetle/June bug. If you are worried about the white grub stage, these are normally kept in check by a variety of natural enemies like ants, parasitoid wasps, and disease. The Japanese beetle is related to the May/June beetle and masked chafer. Some of their favorite food plants that you should avoid include Japanese and Norway maples, roses, English/American elms, and cherry/plum/peach trees. Sand chafers are commonly found along the Platte River valley and other river valleys in Nebraska. As a white grub, larvae feed on the roots of turfgrass causing large brown dead spots in the turf that are easily lifted up like a rug from the floor. 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