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Homeowner Guide: Protect Your Garden from Japanese Beetles
Few things are more frustrating than watching healthy plants become riddled with holes almost overnight. If you’ve spotted metallic green and copper beetles covering your roses, beans, or fruit trees, chances are you are dealing with Japanese beetles. Japanese beetles have become an increasingly common garden pest in Atlantic Canada. They feed in large groups, meaning a handful of beetles can quickly turn into dozens if left unchecked. The key to protecting your garden is identifying them early and taking a combination of preventative and control measures.
Identifying Japanese Beetles
- Adult Japanese beetles are about 1 cm (1/2 inch) long with a shiny metallic green head, copper-coloured wing covers, and distinctive white tufts of hair along each side of their abdomen.
- They feed on more than 300 species of plants, with some of their favourites including:
- Roses
- Grapevines
- Apple and crabapple trees
- Raspberries
- Beans
- Hibiscus
- Birch Trees
- Linden trees
- You can often spot their damage by looking at the leaves. Japanese beetles eat the soft parts between the veins, leaving a lace-like or “skeletonized” look. Flowers might look ragged, and fruit can show scars from feeding.
Start Control Early
- The sooner you begin removing the beetles, the easier they are to manage. Japanese beetles release pheromones while feeding that attract even more beetles to the same plant.
- Check susceptible plants every morning during peak season, usually from late June through August. Beetles are slower and easier to remove in the cooler morning temperatures.
- Pick beetles off by hand and drop them into a bucket of warm, soapy water. This simple method works well, especially if you do it regularly for
a few weeks.
Protect Vulnerable Plants
- In vegetable gardens, floating row covers can keep beetles out but still let sunlight and water in. Remember to take the covers off when your crops need pollination.
- If you have a serious infestation, use insecticides made for Japanese beetles to help reduce damage. Always follow the product instructions, and avoid spraying open flowers when bees or other pollinators are around.
Manage Grubs in Your Lawn
- Japanese beetles begin life as grubs living beneath your lawn. These white C-shaped larvae feed on grass roots before emerging as adult beetles the following summer.
- Signs of grub damage can include:
-
- Brown patches of turf Grass that lifts easily from the soil Increased digging by skunks, raccoons, or birds searching for grubs.
- Grass that lifts easily from the soil
- Increased digging by skunks, raccoons, or birds searching for grubs
- Keeping your lawn healthy with good watering, mowing, and fertilizing helps it bounce back from minor grub damage. If you notice a lot of grubs, lawn grub control products can help lower beetle numbers in the future.
Use Beetle Traps Carefully
- Japanese beetle traps are highly effective at attracting beetles, but that’s also their biggest drawback.
- If placed beside your garden, traps may actually lure more beetles into the area than they capture. If you decide to use them, place traps well away from flower beds, vegetable gardens, and ornamental trees to help draw beetles away from your landscape.
Encourage Natural Predators
- A healthy garden supports birds, beneficial insects, and other wildlife that naturally feed on Japanese beetles and their grubs.
- Planting a variety of flowers and avoiding unnecessary pesticide use helps create a balanced garden ecosystem.
Stay Ahead of the Problem
- Japanese beetles usually don’t go away after just one treatment. You ’ll get the best results by using a mix of methods, like checking your plants often, hand-picking beetles, protecting important plants, and keeping your lawn healthy.
- Spending just a few minutes checking your garden every few days can help prevent major damage and keep your flowers, vegetables, and trees looking great all season.
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