Pest Guides

Which Plants Deter Cucumber Beetles

Pest Guides 1

Cucumber beetles are notorious pests that wreak havoc on your garden, particularly on cucurbit crops like cucumbers, squash, and pumpkins. Fortunately, Mother Nature has provided us with a range of plants that naturally deter these pests. This comprehensive guide will enlighten you on the best plants to deter cucumber beetles, why they work, and how to effectively utilize them in your garden.


Several plants can deter cucumber beetles from your garden. These include marigolds, radishes, nasturtiums, onions, corn, and catnip. These plants work by emitting scents that repel the beetles, confusing them, or attracting beneficial insects that prey on the beetles. However, this should be part of a comprehensive pest management strategy for maximum effectiveness.

Understanding Cucumber Beetles

Cucumber beetles, belonging to the genera Diabrotica and Acalymma, are agricultural pests known to cause severe damage to roots, leaves, flowers, and fruits, and interfere with pollination. They can spread bacterial wilt and the cucumber mosaic virus, making them a serious threat to cucurbit crops.

Natural Deterrents: Plants that Repel Cucumber Beetles

Several plants are known to naturally deter cucumber beetles. Their effectiveness varies based on factors such as scent, taste, and attractiveness to beneficial insects.


Marigolds, particularly French marigold (Tagetes patula) and African marigold (Tagetes erecta), emit a pungent scent that deters many adult insects, including cucumber beetles. Moreover, their blooms attract beneficial insects that feed on or parasitize adult cucumber beetles.


Radishes, through their presence alone, can repel cucumber beetles. They are often associated with thriving cucumber plants, leading to a higher overall yield and quality of produce.


Nasturtiums can confuse and repel cucumber beetles, making them effective companion plants for cucurbits.


The bold odor of onions can repel pests or confuse them by masking the fragrance of their preferred host plants, such as cucumbers.


Planting corn near cucumbers can help keep cucumber beetles at bay.


This herb can help keep cucumber beetles away when planted near cucumbers.

Planting Strategies for Maximum Effect

To maximize the beetle-deterrent effect of these plants, consider using companion planting, trap crops, and push-pull strategies. These techniques involve strategic placement of deterrent plants to confuse, repel, or trap cucumber beetles.

Potential Drawbacks

While using plants to deter cucumber beetles can be effective, potential issues include limited effectiveness, attracting other pests, maintenance requirements, pollinator concerns, and incomplete control of the beetles. Therefore, it’s essential to combine this strategy with other pest management methods for the best results.

Minimizing Risks with Chemical Insecticides

While chemical insecticides can control cucumber beetles, they come with potential risks such as development of insecticide resistance, secondary pest outbreaks, harm to beneficial insects, damage to cucumber leaves, environmental contamination, and human health risks. Therefore, integrated pest management (IPM) strategies are recommended to minimize these risks.


Using plants to deter cucumber beetles is a natural and eco-friendly method to protect your garden. However, it’s important to remember that this should be part of a comprehensive pest management strategy, combining cultural, biological, and chemical measures when necessary. Happy gardening!

Frequently Asked Questions

What other pests can marigolds deter?

Marigolds can deter a variety of pests besides cucumber beetles, such as aphids, nematodes, and tomato hornworms. They are a versatile addition to any pest management strategy in the garden.

How do I use radishes as a deterrent for cucumber beetles?

Radishes can be used as a companion plant. Plant them in close proximity to your cucumbers, and their presence alone can help repel cucumber beetles.

Are there any other types of plants that can repel cucumber beetles?

Yes, there are other plants that can repel cucumber beetles. Some examples include tansy, buckwheat, and broccoli. As always, effectiveness may vary based on a variety of factors.

Can I use these plants to deter cucumber beetles in an indoor plant setup?

Yes, you can use these plants in an indoor setup. However, keep in mind that the effectiveness might vary compared to an outdoor garden due to differences in environmental conditions.

What are some other pest management methods I can combine with this strategy?

There are several other pest management methods you can use, such as crop rotation, use of insect traps, biological control with beneficial insects, and careful use of chemical pesticides as a last resort.

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