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Most Common Green Bean Plant Pests:
Identification and Treatment Guide

Updated: December 24, 2022

Green beans are a popular vegetable in many gardens due to their ease of growing and delicious taste. However, green bean plants are susceptible to a variety of pests that can cause damage to the plant and reduce the yield of the harvest. In this article, we will discuss the most common green bean plant pests, how to identify them, and effective treatment methods.


Aphids are small, soft-bodied insects that feed on the sap of green bean plants. They can cause distortion or stunted growth of the plant and transmit viruses that can lead to the death of the plant. Aphids are typically found on the undersides of leaves or near new growth.

Identification: Aphids are usually green or brown in color and have pear-shaped bodies. They are about 1/8 inch long and have long antennae.

Treatment: A strong stream of water can knock aphids off the plant. Alternatively, you can use insecticidal soap or neem oil to control aphids.

Spider Mites

Spider mites are tiny arachnids that suck sap from green bean plants. They can cause yellowing or bronzing of leaves and webbing on the underside of leaves. Spider mites thrive in hot, dry conditions.

Identification: Spider mites are very small and difficult to see with the naked eye. They are usually found on the undersides of leaves.

Treatment: A strong stream of water can help control spider mites. You can also use insecticidal soap or neem oil to control them.

Bean Leaf Beetle

Bean leaf beetles feed on foliage, flowers, and pods of green bean plants. They can cause significant damage to plants and reduce yields.

Identification: Bean leaf beetles are about 1/4 inch long and have a distinct pattern of black triangles on their backs.

Treatment: You can handpick bean leaf beetles from plants. Alternatively, you can use insecticides labeled for bean leaf beetles.


Cutworms are the larvae of several species of moths. They can cause damage to young green bean plants by cutting them off at the base. Cutworms are active at night and hide in soil during the day.

Identification: Cutworms are about 1 to 2 inches long and vary in color from gray to brown.

Treatment: You can control cutworms by placing collars made from cardboard or plastic around the base of the plant. Alternatively, you can use Bacillus thuringiensis (Bt) or spinosad to control them.


Are there any natural ways to control pests on green bean plants?

Yes, there are several natural ways to control pests on green bean plants. These include using companion planting, such as planting marigolds or garlic near green bean plants, and using homemade sprays made from ingredients like garlic, hot pepper, and soap.

How can I prevent pests from attacking my green bean plants?

You can prevent pests from attacking your green bean plants by practicing good garden hygiene, such as removing plant debris and weeds, rotating crops, and using clean gardening tools. Additionally, you can use row covers to physically block pests from reaching your plants.

In conclusion, identifying and treating common pests that attack green bean plants is essential to maintaining a healthy and productive garden. By following the tips outlined above, you can effectively control pests and ensure a bountiful harvest for years to come.