How To Get Rid Of Boxwood Flies

Getting rid of boxwood flies requires a combination of cultural practices, biological controls, and targeted treatments.
 
Boxwood flies, which are actually the adult stage of boxwood leafminer, can cause serious damage to your shrubs if left unchecked.
 
These tiny flying insects lay eggs inside the leaves, leading to unsightly blotches and premature leaf drop.
 
In this post, we’ll explore exactly how to get rid of boxwood flies using methods that are both effective and easy to apply.
 
Let’s dive into the steps to keep your boxwood healthy and fly-free.
 

How to Get Rid of Boxwood Flies with Early Detection

The first step in getting rid of boxwood flies is spotting them before they cause major damage.
 

1. Look for Yellowing or Blistering Leaves

When boxwood flies are active, you’ll often see small yellow or brown blisters on the upper leaf surface.
 
These blisters are where the larvae have been feeding inside the leaf tissue.
 
If you flip the leaf over, you might see tiny orange or yellow larvae inside the blister.
 
Early detection gives you a head start on how to get rid of boxwood flies before they multiply.
 

2. Use Yellow Sticky Traps

Yellow sticky traps are excellent for monitoring adult boxwood flies during spring.
 
Hang them near your boxwood plants as soon as the weather warms up.
 
Check the traps weekly to see when the flies emerge and how many are present.
 
This information tells you exactly when to apply treatments to get rid of boxwood flies more effectively.
 

3. Inspect for Adult Flies at Dawn and Dusk

Adult boxwood flies are most active in the early morning and late evening.
 
Go outside with a white piece of paper and gently tap a branch.
 
If small flies fall onto the paper, you have an active infestation that needs attention.
 
Regular inspection is a key part of any plan to get rid of boxwood flies.
 

Natural Methods to Eliminate Boxwood Flies

You don’t always need harsh chemicals to get rid of boxwood flies.
 
Natural approaches are safe for pollinators, pets, and the environment.
 

1. Prune and Remove Infested Leaves

When you see blistered leaves, carefully prune them off and seal them in a plastic bag.
 
Dispose of the bag in the trash—never compost infested leaves.
 
This physical removal reduces the number of larvae that will turn into adult boxwood flies.
 
It’s a simple and effective way to get rid of boxwood flies at the source.
 

2. Encourage Natural Predators

Beneficial insects like parasitic wasps and lacewings feed on boxwood fly larvae.
 
Plant dill, fennel, or yarrow near your boxwood to attract these helpers.
 
Avoid broad-spectrum insecticides that kill both pests and predators.
 
By boosting predator populations, you can get rid of boxwood flies without spraying anything.
 

3. Apply Neem Oil as a Preventive

Neem oil is a natural product that disrupts the life cycle of boxwood flies.
 
Spray it on the leaves in early spring when adults are laying eggs.
 
Make sure to coat the undersides of leaves where eggs are deposited.
 
Reapply after rain to maintain control and steadily get rid of boxwood flies.
 

Chemical Controls for Persistent Boxwood Fly Infestations

Sometimes natural methods aren’t enough to get rid of boxwood flies quickly.
 
In those cases, targeted chemical treatments can save your shrubs.
 

1. Use Systemic Insecticides for Larvae

Systemic products containing imidacloprid or dinotefuran are absorbed by the plant.
 
Apply them as a soil drench in early spring so the chemical moves into the leaves.
 
This kills the larvae as they feed, breaking the cycle of boxwood flies.
 
Always follow label directions to protect pollinators and avoid runoff.
 

2. Spray Contact Insecticides at the Right Time

Contact sprays like pyrethrin or spinosad work best when adult boxwood flies are active.
 
Time your spray to coincide with peak emergence, usually in mid-spring.
 
Spray thoroughly, covering all leaf surfaces, especially the lower sides.
 
One well-timed application can dramatically help you get rid of boxwood flies.
 

3. Consider Horticultural Oil for Eggs and Larvae

Horticultural oil smothers boxwood fly eggs and young larvae on contact.
 
Apply it during the dormant season or just before bud break in spring.
 
It’s less toxic than synthetic insecticides and breaks down quickly.
 
Including oil sprays in your annual routine makes it easier to get rid of boxwood flies year after year.
 

Cultural Practices That Help You Get Rid of Boxwood Flies Long-Term

Prevention is the best way to get rid of boxwood flies permanently.
 
Healthy boxwoods are more resistant to infestations.
 

1. Water Properly and Avoid Stress

Water at the base of the plant to keep foliage dry and less attractive to boxwood flies.
 
Deep watering once a week during dry spells promotes strong root growth.
 
Stressed plants produce more volatile compounds that attract pests.
 
By keeping your boxwood stress-free, you reduce the need to get rid of boxwood flies later.
 

2. Mulch and Fertilize Smartly

Apply a 2–3 inch layer of organic mulch around the root zone.
 
Mulch conserves moisture and moderates soil temperature.
 
Use a balanced slow-release fertilizer in early spring, not high-nitrogen formulas.
 
Excess nitrogen encourages lush growth that boxwood flies love to attack.
 

3. Choose Resistant Varieties When Replanting

If you’re planting new boxwood, look for cultivars bred for resistance to leafminers.
 
Varieties like ‘Green Velvet’ and ‘Winter Gem’ show less damage from boxwood flies.
 
Resistant plants require fewer interventions to get rid of boxwood flies over their lifetime.
 
This is the most sustainable solution for long-term pest management.
 

So, How to Get Rid of Boxwood Flies?

Getting rid of boxwood flies is achievable with a consistent, integrated approach.
 
You start by detecting the pest early using sticky traps and leaf inspections.
 
Then you combine pruning, natural predators, and neem oil for a gentle but effective response.
 
If the infestation is severe, systemic or contact insecticides can provide quick relief.
 
Finally, cultural practices like proper watering and resistant varieties keep boxwood flies from returning.
 
Remember, the key to getting rid of boxwood flies is acting at the right time and staying vigilant each season.
 
Your boxwood will thank you with lush, green foliage for years to come.