How to Get Rid of Caterpillars on Rhubarb Plant

Rhubarb is a popular plant known for its tart and tangy stalks, which are commonly used in pies and other desserts. However, like many other plants, rhubarb is often plagued by caterpillars that can cause extensive damage if left unchecked. These voracious insects feed on the leaves and stems of the plant, potentially reducing its overall health and yield. If you’re dealing with a caterpillar infestation on your rhubarb plant, don’t fret. In this article, we will discuss effective methods to get rid of caterpillars and protect your rhubarb.

1. Identify the Caterpillars

Before taking any action, it’s crucial to identify the type of caterpillars infesting your rhubarb plant. Different species have different habits and may require specific control methods. The most common caterpillars found on rhubarb are the cabbage looper (Trichoplusia ni) and the variegated cutworm (Peridroma saucia). Both of these pests are known for their voracious appetites and can quickly defoliate a rhubarb plant if left unchecked.

2. Handpicking

One of the simplest and most effective ways to get rid of caterpillars is by handpicking them off your rhubarb plant. While it may be a tedious task, especially if you have a large garden, it can be highly beneficial in controlling the infestation. Inspect your plant regularly, focusing on the undersides of leaves where caterpillars tend to hide. Using gloves, remove any caterpillars you find and dispose of them in a bucket of soapy water or by squishing them.

3. Beneficial Insects

Encouraging natural predators is an excellent method for controlling caterpillar populations in your garden. Many beneficial insects, such as ladybugs, lacewings, and parasitic wasps, feed on caterpillars and can help keep their numbers in check. To attract these helpful insects, plant flowers like marigolds, daisies, and yarrow near your rhubarb plant. Additionally, avoid using broad-spectrum insecticides that could harm the beneficial insects you want to attract.

4. Biological Control

If handpicking and attracting beneficial insects are not sufficient to control the caterpillar population on your rhubarb plant, you may consider using biological control methods. Bacillus thuringiensis (Bt), a naturally occurring soil bacterium, is an effective biological control agent against caterpillars. It produces a toxin that specifically targets and kills caterpillars while being harmless to humans, animals, and beneficial insects. Bt can be applied as a spray directly onto the leaves of the rhubarb plant following the manufacturer’s instructions.

5. Neem Oil

Neem oil is another organic option for controlling caterpillars on your rhubarb plant. Extracted from the seeds of the neem tree (Azadirachta indica), neem oil acts as a natural insecticide and repellant. It disrupts the feeding behavior and growth of caterpillars, ultimately leading to their demise. Dilute neem oil according to the instructions on the product label and spray it onto the affected areas of your rhubarb plant. Be sure to cover both sides of the leaves thoroughly for maximum effectiveness.

6. Homemade Remedies

If you prefer homemade solutions, there are a few remedies that you can try to repel caterpillars naturally. One popular option is a mixture of garlic and chili pepper spray. Simply blend several cloves of garlic with a few chili peppers and water. Strain the mixture and dilute it with more water before applying it to your rhubarb plant. The strong odor and taste of the mixture will deter caterpillars from feeding on the leaves.

7. Physical Barriers

To prevent caterpillars from reaching your rhubarb plant, you can use physical barriers such as row covers or netting. These materials create a barrier between the caterpillars and the plant, preventing them from accessing the leaves and causing damage. Ensure that the barriers are securely in place and cover the entire plant to be effective.

8. Cleanliness and Maintenance

Maintaining cleanliness in your garden is crucial to prevent caterpillar infestations. Remove any fallen leaves or debris regularly, as they can provide hiding places for caterpillars. Additionally, keep a close eye on nearby plants, especially those known to attract caterpillars, such as brassicas and dill. By promptly removing any caterpillar-infested plants in the vicinity, you can reduce the chances of a larger infestation spreading to your rhubarb.

Conclusion

Caterpillars can pose a significant threat to the health and productivity of your rhubarb plant. However, by using a combination of handpicking, attracting beneficial insects, employing biological control methods, utilizing neem oil or homemade remedies, implementing physical barriers, and maintaining cleanliness in your garden, you can effectively get rid of caterpillars on your rhubarb plant. With these strategies in place, you’ll be able to enjoy a thriving rhubarb crop without the worry of caterpillar damage.