As a supplier of low tunnel greenhouses, I've had the privilege of working closely with numerous growers. These structures offer an ideal environment for cultivating a wide variety of plants, providing protection from harsh weather conditions and extending the growing season. However, one challenge that growers often face is dealing with pests. In this blog, I'll discuss some of the most common pests found in low tunnel greenhouses and share insights on how to manage them effectively.
Aphids
Aphids are tiny, soft - bodied insects that can cause significant damage to plants in low tunnel greenhouses. They are usually found on the undersides of leaves and on new growth. These pests feed on plant sap, which can lead to stunted growth, yellowing of leaves, and the distortion of plant parts. Moreover, aphids can transmit plant viruses, further compromising the health of your crops.
Aphids reproduce rapidly, with females giving birth to live young without mating in many cases. This means that a small aphid infestation can quickly turn into a large - scale problem. In a low tunnel greenhouse, the warm and relatively protected environment can accelerate their reproduction.
To control aphids, you can introduce natural predators such as ladybugs and lacewings. These beneficial insects feed on aphids and can help keep their populations in check. You can also use insecticidal soaps or neem oil, which are less harmful to the environment and beneficial insects compared to chemical pesticides. For more information on setting up an effective low tunnel greenhouse to prevent aphid infestations, you can refer to our Outdoor Tunnel Greenhouse solutions.
Whiteflies
Whiteflies are another common pest in low tunnel greenhouses. They are small, white insects that resemble tiny moths. When disturbed, they fly up in a cloud from the plants. Similar to aphids, whiteflies feed on plant sap, causing yellowing, wilting, and reduced plant vigor. They also excrete a sticky substance called honeydew, which can lead to the growth of sooty mold on the plants.
Whiteflies can be difficult to control because they reproduce quickly and can develop resistance to pesticides. In a low tunnel greenhouse, their populations can build up rapidly due to the enclosed environment. One way to manage whiteflies is to use yellow sticky traps. These traps attract the whiteflies, which then get stuck to the sticky surface. You can also use biological control methods, such as introducing parasitic wasps that target whitefly eggs and larvae. Our Backyard Greenhouse for Winter models can be designed to reduce the likelihood of whitefly infestations by providing proper ventilation and light conditions.
Spider Mites
Spider mites are not insects but rather arachnids. They are extremely small and often go unnoticed until significant damage has occurred. Spider mites feed on the undersides of leaves, piercing the plant cells and sucking out the contents. This results in a stippled appearance on the leaves, which may eventually turn yellow and fall off. In severe infestations, fine webbing can be seen on the plants.
Spider mites thrive in hot and dry conditions, which can be common in low tunnel greenhouses, especially during the summer months. To control spider mites, you can increase the humidity in the greenhouse by misting the plants regularly. You can also introduce predatory mites, which feed on spider mites. Additionally, using insecticidal sprays can be effective, but make sure to choose products that are specifically formulated for spider mites. Our Insulated Greenhouse options can help maintain a more stable environment, reducing the risk of spider mite outbreaks.
Thrips
Thrips are slender, tiny insects that can cause damage to both the leaves and flowers of plants in low tunnel greenhouses. They feed by scraping the surface of plant tissues and sucking up the sap. This can result in silver - streaked or distorted leaves, as well as damaged flowers. Thrips can also transmit plant viruses, such as tomato spotted wilt virus.
Thrips are difficult to control because they are small and can hide in tight spaces within the plants. Yellow or blue sticky traps can be used to monitor and reduce thrip populations. Biological control agents, such as predatory mites and minute pirate bugs, can also be effective in managing thrips. In some cases, insecticides may be necessary, but it's important to rotate different types of insecticides to prevent thrips from developing resistance.
Slugs and Snails
Slugs and snails are common pests that can cause damage to the foliage and fruits of plants in low tunnel greenhouses. They are most active at night and prefer moist environments. These pests leave behind large, irregular holes in the leaves and can also damage the stems and fruits of plants.
To control slugs and snails, you can create barriers around the plants using materials such as copper tape or diatomaceous earth. These substances irritate the slugs and snails, preventing them from reaching the plants. You can also set up beer traps, which attract slugs and snails. Once they crawl into the trap, they drown in the beer. Maintaining a clean greenhouse by removing debris and keeping the area around the plants dry can also help reduce slug and snail populations.
Caterpillars
Caterpillars are the larval stage of butterflies and moths. They can cause significant damage to plants in low tunnel greenhouses by chewing on the leaves, stems, and fruits. Some common caterpillars found in greenhouses include cabbage loopers, tomato hornworms, and armyworms.
To control caterpillars, you can hand - pick them off the plants if the infestation is small. You can also use biological control methods, such as Bacillus thuringiensis (Bt), which is a naturally occurring bacterium that is toxic to caterpillars. Insecticides can also be used, but make sure to choose products that are safe for the plants and the environment.
Managing Pests in Low Tunnel Greenhouses
Preventing and managing pests in low tunnel greenhouses requires a comprehensive approach. Here are some general tips:
- Sanitation: Keep the greenhouse clean by removing dead plants, fallen leaves, and other debris. This reduces the hiding places and breeding grounds for pests.
- Inspection: Regularly inspect your plants for signs of pest infestations. Early detection can help prevent the spread of pests and reduce the damage to your crops.
- Quarantine: When introducing new plants into the greenhouse, quarantine them for a few days to make sure they are pest - free.
- Proper Ventilation: Good ventilation helps maintain a healthy environment in the greenhouse and can reduce the risk of pest infestations. It also helps prevent the buildup of humidity, which can attract some pests.
- Monitoring: Use traps and other monitoring techniques to keep track of pest populations. This allows you to take action before the infestation becomes severe.
As a low tunnel greenhouse supplier, we understand the challenges that growers face when dealing with pests. Our range of greenhouses is designed to provide a suitable environment for plant growth while minimizing the risk of pest infestations. If you're interested in learning more about our products or need advice on pest management in your low tunnel greenhouse, we encourage you to contact us for a procurement discussion. We're here to help you build a successful and pest - free greenhouse operation.
References
- "Pests of Greenhouse Crops" by R. G. van Lenteren and H. F. van Roermund.
- "Integrated Pest Management in Greenhouses" by David J. Schuster and Jeffrey W. Lotz.
- "Greenhouse Gardening for Beginners" by Lisa Eldred Steinkopf.
