How to Stop Flies in Greenhouse

How to Stop Flies in Greenhouse?

A sunny summer morning, and I’m opening the doors to my greenhouse. There’s a lovely smell of blooming flowers, and I’m hoping for a good harvest. But guess what? Instead of peace, there are annoying flies buzzing around my precious plants. They lay eggs in the soil I’ve been taking care of and munch on my plant’s leaves. It’s really frustrating!

But don’t worry, in this guide, I’ll share the tips I’ve learned after many tries. These tricks will help you get rid of those annoying flies in your greenhouse and keep your plants safe. Let’s get started and say goodbye to those pesky bugs!

To stop flies in a greenhouse follow these quick methods :

  • Maintain cleanliness and remove decaying plant matter.
  • Ensure proper water management and drainage.
  • Install fine mesh screens on doors and windows.
  • Use yellow sticky traps to capture flies.
  • Introduce beneficial insects and predators.
  • Consider biological controls like nematodes.
  • Ensure potting soil is free of fly larvae.
  • Remove heavily infested plants promptly.
  • Use fly traps and biological insecticides.
  • Apply organic sprays or neem oil.
  • Conduct regular inspections for early detection.
  • Quarantine new plants to prevent infestations.

What Are the Key Sanitation and Maintenance Practices?

What Are the Key Sanitation and Maintenance Practices

To effectively deter flies in your greenhouse, implementing key sanitation and maintenance practices is essential.

Keep the greenhouse clean and debris-free:

Regularly remove fallen leaves, dead plants, and any other organic debris from the greenhouse. Flies are attracted to decaying matter, so keeping the space clean reduces their breeding sites.

In addition, maintain your plants by pruning dead or damaged foliage and promptly removing any weeds. These can serve as breeding grounds for flies as well.

Proper water management and drainage:

Overwatering can lead to excess moisture, which not only promotes fungal and bacterial growth but can also create stagnant pools of water. Flies are attracted to both moisture and the microorganisms that thrive in it.

Furthermore, ensure your greenhouse has adequate drainage systems to prevent water from accumulating on the ground. Standing water can become a breeding site for flies.

Soil management and pasteurization:

Before using potting soil in your greenhouse, inspect it thoroughly to make sure it’s free of fly eggs, larvae, or pupae. Consider pasteurizing or sterilizing the soil to kill any potential pests or pathogens.

In addition, maintain healthy soil in your pots and containers to discourage fly infestations. Healthy soil with a good balance of nutrients is less attractive to flies.

What Are the Benefits of Using Physical Barriers?

From safeguarding plant health to reducing chemical usage, these barriers offer a range of compelling benefits.

Installation of fine mesh screens:

Fine mesh screens on doors, windows, and vents act as a physical barrier to prevent flies from entering your greenhouse.

In addition, regularly inspect screens for any damage or gaps and promptly repair or replace them as needed to maintain their effectiveness.

Use of yellow sticky traps:

Yellow sticky traps are highly attractive to many types of flies due to their color. Flies are drawn to the traps and get stuck when they land on them.Hang the traps at various heights throughout the greenhouse, ensuring they are positioned near potential entry points for flies.

Furthermore, check the traps regularly to gauge the level of fly activity and to determine if further control measures are needed.

Quarantine procedures for new plants:

Before introducing new plants into your greenhouse, isolate them in a separate area for a period (quarantine) to monitor them for any signs of fly infestations or other pests.

During the quarantine period, closely inspect the new plants for any signs of flies, larvae, or damage. If issues arise, address them before integrating the new plants into your main greenhouse space.

How Effective Are Biological Controls in Pest Management?

Exploring the effectiveness of biological controls in pest management within your greenhouse reveals a sustainable and eco-friendly approach to curbing fly populations. 

Introduction of beneficial insects and predators:

Identify and introduce natural predators of flies, such as ladybugs, lacewings, parasitic wasps, and predatory mites, into your greenhouse. Furthermore, these beneficial insects feed on fly larvae or eggs, helping to control the fly population in a natural and sustainable manner.

Moreover, ensure that the introduced beneficial insects are compatible with the plants in your greenhouse and won’t harm other beneficial species.

Biological control agents like nematodes:

These are microscopic, non-segmented roundworms that can be applied to the soil. Certain species of nematodes, like Steinernema feltiae, are effective at targeting fly larvae.

In addition, apply nematodes to the soil according to the manufacturer’s instructions, usually by mixing them with water and watering the soil.

Nematodes infect and kill fly larvae by entering their bodies and releasing bacteria, which ultimately causes the death of the larvae.

Removal of infested plants:

However, if you discover plants in your greenhouse heavily infested with flies or their larvae, it’s crucial to remove them promptly.

Isolate these infested plants away from healthy ones to prevent the infestation from spreading further.

In addition, dispose of the infested plants properly, either by bagging and sealing them or by composting them at high temperatures to ensure that the flies and their eggs are destroyed.

Which Chemical and Organic Solutions Work Best for Pest Control?

Finding the perfect balance between chemical and organic solutions for pest control in your greenhouse is a critical step in maintaining a healthy, thriving ecosystem.

Use of biological insecticides:

Biological insecticides like Bacillus thuringiensis (BT) are specific to certain fly species and can be used to target fly larvae without harming other beneficial insects.

Furthermore, apply these insecticides according to the manufacturer’s instructions, usually as a spray directly onto affected plants or soil.

Application of organic sprays, neem oil, or BT:

  • Organic Sprays: Organic insecticidal sprays, such as insecticidal soap or neem oil, can deter and kill adult flies on contact.
  • Neem Oil: Neem oil has insect-repelling properties and can disrupt the feeding and breeding of flies.
  • BT: Bacillus thuringiensis (BT) can be applied as a powder or spray to target fly larvae specifically.

Consideration of integrated pest management (IPM):

  • IPM Approach: IPM involves a holistic approach to pest management, combining multiple strategies like biological controls, cultural practices, and chemical solutions.
  • Sustainability: IPM aims to minimize the use of chemical pesticides, focusing on prevention, monitoring, and the least harmful methods for controlling pests.
  • Long-term Success: By considering IPM, you can create a sustainable and effective fly control plan tailored to your greenhouse’s specific needs.

What’s the Importance of Regular Monitoring and Inspection?

What's the Importance of Regular Monitoring and Inspection

Regular monitoring and inspection emerge as the cornerstone of effective pest management in your greenhouse. 

Importance of routine checks for fly infestations:

Regular monitoring is a critical component of proactive pest management. It allows you to identify potential fly infestations before they become severe problems.

Flies can reproduce rapidly, and an undetected infestation can quickly get out of control. Routine checks serve as an early warning system, helping you take action when fly populations are still manageable.

Timely detection of fly infestations helps protect the overall health of your greenhouse plants, as flies can damage leaves, stems, and fruit.

Early detection and prompt action:

During routine inspections, carefully examine plants, soil, and the greenhouse environment for signs of flies, such as adult flies, larvae, pupae, or characteristic damage like yellowing leaves or stippling.

Maintain records of your inspections, noting the date, location, and any observations. This can help track patterns and the effectiveness of control measures over time. Establish threshold levels for fly populations that trigger action. These thresholds can be based on the specific type of fly, the crop you’re growing, and the potential for economic damage.

However, when you detect fly infestations above the established thresholds, take immediate action using the appropriate control methods discussed earlier, such as biological controls, physical barriers, or chemical solutions.

Continue to monitor and inspect regularly, even after taking action, to ensure that the infestation is under control and doesn’t return.


What smell keeps flies away?

Certain scents like lavender, mint, eucalyptus, and citronella can help deter flies.

How do you stop flies from growing?

Preventing fly larvae from developing into adult flies involves removing breeding sites, using biological controls, or applying insecticides specifically targeting larvae.

What makes flies go away?

Flies are repelled by clean and well-maintained environments, screens on doors and windows, and the presence of fly-repellent scents or traps.

What is a natural fly killer?

Natural fly killers include predators like spiders and birds, as well as insect-eating plants like sundews or pitcher plants.

What is the best homemade fly spray?

A homemade fly spray can be made with ingredients like vinegar, dish soap, and water. Recipe variations include mixing vinegar and essential oils like lavender or citronella.

What kills flies the fastest?

Quick methods to kill flies include fly swatters, fly zappers, and aerosol fly sprays designed for rapid knockdown.

Does vinegar keep flies away?

Yes, vinegar can be used as a fly deterrent. Mixing vinegar with water and placing it in bowls or using it in a homemade fly spray can help repel flies.


In conclusion, I have learned that effectively managing flies in a greenhouse requires a multifaceted approach that encompasses various strategies and techniques. Maintaining proper sanitation and vigilant maintenance practices, such as keeping the greenhouse clean, managing water effectively, and ensuring soil health, forms the foundation of fly control. The use of physical barriers, like fine mesh screens and yellow sticky traps, serves as a crucial preventive measure. 

Furthermore, incorporating biological controls, such as introducing beneficial insects and employing biological agents like nematodes, can contribute to long-term and sustainable fly management. 

When necessary, resorting to chemical and organic solutions, such as biological insecticides and neem oil, should be done cautiously, with an eye on minimizing environmental impact. 

Lastly, adopting an integrated pest management (IPM) approach, combining these methods while emphasizing regular monitoring and early detection, proves indispensable in maintaining a healthy greenhouse environment. 

Overall, I now understand that a holistic and proactive approach is key to preventing and mitigating fly infestations, ensuring the well-being of greenhouse plants and maximizing their growth potential.

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