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The best way to get rid of boxwood beetles involves a multi-step approach that targets both the adult beetles and their larvae.
If you’ve noticed small, shiny green beetles munching on your boxwood shrubs, you’re likely dealing with boxwood beetles.
These pests can cause serious damage if you don’t take action to get rid of boxwood beetles as soon as you spot them.
In this post, we’ll cover why you need to get rid of boxwood beetles, the most effective methods for getting rid of boxwood beetles, and how to prevent them from coming back.
Let’s dive right in.
How to Get Rid of Boxwood Beetles: Know Your Enemy
To properly get rid of boxwood beetles, you first need to understand what you’re up against.
Boxwood beetles (also called boxwood leafminers) are the larvae of a small fly that lays eggs inside boxwood leaves.
The larvae feed inside the leaf tissue, causing yellowing, browning, and premature leaf drop.
Adult boxwood beetles are tiny, about 1/8 inch long, and they emerge in spring to mate and lay new eggs.
Knowing this life cycle is crucial for timing your efforts to get rid of boxwood beetles.
1. Identify the Damage Early
Look for blister-like swellings on boxwood leaves, or leaves that are yellow and curly.
If you peel back the leaf surface, you might see tiny orange larvae inside.
That’s a sure sign you need to get rid of boxwood beetles before the infestation spreads.
2. Understand the Life Cycle
Adult boxwood beetles emerge in early spring, usually when the first new growth appears.
Females insert eggs into young leaves, and the larvae feed through summer.
They overwinter inside the leaves, then pupate and emerge the following spring.
To effectively get rid of boxwood beetles, you must target both the larval stage and the adult emergence.
3. Assess the Damage Level
A few damaged leaves may not require immediate action.
But if more than 10–15% of the foliage shows signs of boxwood beetles, you need a plan to get rid of boxwood beetles.
Heavy infestations can weaken shrubs and make them susceptible to other diseases.
Natural Methods to Get Rid of Boxwood Beetles
If you prefer a chemical-free approach, you can still get rid of boxwood beetles using these natural strategies.
These methods work best when you start early and stay consistent.
1. Prune and Dispose of Infested Leaves
In early spring before the adults emerge, cut off and remove any leaves showing blister mines.
Seal the clippings in a plastic bag and throw them in the trash, not the compost.
This physically removes many larvae and helps you get rid of boxwood beetles without sprays.
2. Encourage Beneficial Insects
Parasitic wasps and ladybugs are natural predators of boxwood beetles.
Plant dill, fennel, and yarrow near your boxwood to attract these helpful insects.
They can significantly reduce the population and help you get rid of boxwood beetles naturally.
3. Use Neem Oil or Horticultural Oil
Spray neem oil on the foliage in early spring when adults are active.
The oil suffocates adult boxwood beetles and disrupts egg-laying.
Make sure to coat the undersides of leaves thoroughly, and repeat every 7–10 days until you’ve controlled the infestation.
Chemical Options to Get Rid of Boxwood Beetles
When natural methods aren’t enough, chemical treatments can help you get rid of boxwood beetles effectively.
Always follow label directions and wear protective gear.
1. Systemic Insecticides
Products containing imidacloprid or dinotefuran are absorbed by the plant and kill larvae inside the leaves.
Apply in late winter or early spring before the beetles become active.
This method provides season-long control and is a reliable way to get rid of boxwood beetles.
2. Contact Insecticides
Sprays with pyrethroids (e.g., bifenthrin, permethrin) kill adult boxwood beetles on contact.
Apply when you first see adults in spring, usually around April or May depending on your region.
Two or three applications spaced 10–14 days apart can help you get rid of boxwood beetles quickly.
3. When to Apply Chemical Treatments
Timing is everything.
For systemic products, apply when soil temperatures are above 50°F and the plants are actively growing.
For contact sprays, apply in the evening to avoid harming bees and other pollinators.
Reapply after rain if needed to maintain effectiveness in your effort to get rid of boxwood beetles.
Prevention: Stop Boxwood Beetles Before They Start
After you successfully get rid of boxwood beetles, you want to keep them away.
Prevention is easier than treatment.
1. Choose Resistant Varieties
Some boxwood cultivars are less susceptible to boxwood beetles.
Look for varieties like ‘Green Velvet’ or ‘Winter Gem’ that show natural resistance.
Planting these can reduce the need to get rid of boxwood beetles in the future.
2. Maintain Healthy Plants
Water deeply but infrequently, and avoid overhead irrigation that keeps leaves wet.
Fertilize in early spring with a balanced slow-release fertilizer.
Healthy boxwood shrubs are better able to tolerate minor infestations and recover quickly.
3. Monitor Every Spring
Inspect your boxwood regularly in March and April for the first signs of adult boxwood beetles.
Use yellow sticky traps to catch adults and gauge population size.
Early detection makes it much easier to get rid of boxwood beetles before they multiply.
So, How Do You Get Rid of Boxwood Beetles?
You can get rid of boxwood beetles by combining early detection, physical removal, natural predators, and targeted treatments.
Start by pruning infested leaves in late winter, then introduce beneficial insects or apply neem oil in early spring.
If the infestation is severe, systemic insecticides provide long-lasting control.
Prevention through resistant varieties and good plant care will help you avoid future outbreaks.
Now you have a complete plan to get rid of boxwood beetles and keep your boxwood healthy and beautiful.