Adults emerge in May through June depending on the area. They fly to a plant, feed, release a pheromone and mate. This pheromone attracts others, so numerous beetles will be found in a small area.
After feeding occurs, the female flies to an area of turf and burrows down into the soil and lays 1 to 5 eggs. She re-emerges to feed, mate and lay eggs again. She repeats this until she has laid 40 to 60 eggs in a 6 to 8 week period.
Control of the adults is difficult due to how mobile they are. There are a couple of things you can do to improve control including using Fertilome Spreader Sticker in sprays and treat the soil under the plant and its foliage.
Systemic insecticides are very effective for use on non-edible plants. Treat as prescribed by the label and let it do the work. Fertilome Tree & Shrub Systemic Drench lasts the longest, Fertilome Rose & Flower Food with Systemic and Fertilome 2-N-1 with Systemic Insecticide offer other benefits as well as insecticide.
Also on non-edible plants: Hi- Yield 38 Plus is effective as a spray and Hi-Yield Turf Ranger works well on the soil beneath the plant. Use Hi-Yield Indoor/Outdoor Broad Use Insecticide for a non-systemic spray as directed on the label. Bonide Japanese Beetle Killer spray is available in a RTU spray bottle to treat small areas. Bonide Beetle Killer is available in a hose-end spray bottle that can cover up to 16,000 sq. feet. It will kill Japanese beetles plus other types of beetles.
For the fruit and vegetable garden, you can use Bonide Eight Home and Garden Insect sprays and dust as directed on the label. You can also use Rescue Japanese Beetle Traps. The trap uses floral scents, along with the beetle’s natural sex attractant to lure both male and female beetles to the trap. Once in the bag the beetles are trapped and cannot fly out. The trap should be placed on a post or stake 4’ above the ground at least 30 feet from ornamental plants, to lure beetles away from the area where they are creating damage.
Japanese Beetle Grub
Japanese beetle grubs can be a very destructive pest in the lawn. Eggs hatch in 8 to 14 days and feed on turf roots, they winter over as a grub, pupate in the spring and emerge as an adult. As few as 7 to 15 grubs per sq. ft. can be damaging to a turf area.
Milky Spore is a natural product that kills the grub stage of the Japanese beetle. Milky Spore Powder contains Bacillus popillae, a bacterium that kills grubs by multiplying inside them, causing the grubs to die. It does not harm people, pets, bees, beneficial insects or the environment and is safe to use around waterways. Apply Milky Spore powder using one teaspoonful every 4 feet in a checker board pattern on your lawn. There is a ten year performance guarantee on control of the Japanese Beetle Grub. The spore can remain in the soil for up to 20 years.
Bonide Annual Grub Beater contains 5% Imidacloprid, a systemic insecticide. Available in a 6 lb. bag that covers 5000 sq. feet and a 18 lb. bag that covers 15,000 sq. feet. It is applied once a year and it controls grubs all season long. It also kills European Crane Fly larvae, Billbugs, Mole Crickets, Cinch Bugs and other turf destroying insects. Apply any time, spring through summer.
Bayer Season Long Grub Control Spray is available in a hose end spray bottle that will treat 5000 sq. feet. Apply anytime in spring through late summer. Kills Japanese Beetle grubs plus larva of Mole Crickets & European Crane Flies. Contains 1.47 % Imidacloprid.
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Life Cycle of the Japanese Beetle