Root Weevil

A Comprehensive Guide to Identification, Damage, and Control

Root Weevils are a type of beetle that feeds on the roots and leaves of plants. They are small, ranging in size from 3 to 10mm, and are usually black or dark brown in color. The adults have a hard exoskeleton and long snouts, while the larvae are white and C-shaped.


To identify Root Weevils, it’s important to look for signs of damage to the plants. Yellowing or wilting leaves, notches or holes in the leaves, or stunted growth can all be indications of a Root Weevil infestation. The larvae can often be found in the soil around the base of the plant, while the adult beetles may be visible on the foliage at night.


Root Weevils are known to cause significant damage to plants, particularly in the larval stage. They feed on the roots of plants, which can weaken and stunt growth. This can lead to yellowing of the leaves, wilting, and even death in severe cases. Root Weevils can also cause damage to the foliage of plants, resulting in notches or holes in the leaves.

Natural Control Methods

There are several natural methods that can be used to manage Root Weevils in a garden setting. Here are some options that are suitable for Live Oak, FL (USDA Zone 8B):

  1. Beneficial nematodes: Beneficial nematodes are microscopic organisms that can be added to the soil to control Root Weevil larvae. They work by infecting and killing the larvae, and can be purchased online or at garden supply stores.

  2. Diatomaceous earth: Diatomaceous earth is a powder made from the fossilized remains of diatoms, which are tiny marine organisms. When sprinkled on the soil around plants, it can kill Root Weevil larvae by dehydrating them. It is important to use food-grade diatomaceous earth and to wear a mask when applying it, as it can be harmful if inhaled.

  3. Neem oil: Neem oil is a natural pesticide that can be used to repel Root Weevils. It works by disrupting the insect’s feeding and reproductive systems. It can be sprayed on the foliage of plants, but should be used sparingly as it can also harm beneficial insects.

  4. Companion planting: Planting certain plants alongside others can help to deter Root Weevils. Plants such as garlic, chives, and marigolds are known to repel the insects and can be planted near susceptible plants.

Pest Management

If natural methods fail to manage the Root Weevil infestation, there are several pest management options that can be considered. These include:

  1. Chemical insecticides: Chemical insecticides can be effective in controlling Root Weevils, but should be used as a last resort. They can be harmful to beneficial insects and can also have negative effects on the environment.

  2. Soil drenches: Soil drenches can be used to target Root Weevil larvae in the soil. These treatments should be applied in the fall or early spring, when the larvae are most active.

  3. Physical barriers: Physical barriers such as sticky traps or copper mesh can be used to prevent adult Root Weevils from laying eggs on plants.


In conclusion, Root Weevils can cause significant damage to plants in a garden setting. However, there are several natural and pest management methods that can be used to control the infestation. It’s important to carefully consider the options available and to choose the most appropriate method for your specific situation. By taking proactive steps to manage Root Weevils, you can help to protect your plants and ensure a healthy garden.

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