Updated: July 14, 2023

Irish moss (Sagina subulata) is a popular ground cover plant known for its lush, carpet-like appearance and delicate white flowers. However, like any other plant, it can be susceptible to various pests and diseases. One common problem that gardeners often encounter with Irish moss is the presence of lerps.

Lerps are small, sap-sucking insects that attach themselves to the leaves of plants, forming a protective covering made of waxy secretions. They not only cause aesthetic damage by creating unsightly patches on the foliage but can also weaken the plant over time if left untreated. If you have noticed the presence of lerps on your Irish moss plant, here are some effective methods to get rid of them and restore the health and beauty of your plant.

1. Regularly Inspect and Monitor

The first step in dealing with any pest problem is regular inspection and monitoring. Take the time to closely examine your Irish moss plant for signs of lerps. These tiny, oval-shaped insects usually form small, white or brownish bumps on the leaves. Look for any discoloration or damage caused by their feeding activity. By catching the infestation early, you can prevent it from spreading and causing further harm.

2. Manual Removal

Once you have identified the presence of lerps on your Irish moss plant, it’s time to take action. The simplest and most effective method of control is manual removal. Gently scrape off the lerps from the leaves using your fingernail or a soft brush. Be careful not to damage the plant in the process. Dispose of the removed lerps away from your garden to prevent reinfestation.

3. Pruning Infested Parts

In severe cases where lerps have spread across a large portion of your Irish moss plant, pruning may be necessary. Carefully remove the infested branches or sections of the plant using clean and sterilized pruning shears. This will not only eliminate the lerps but also promote new growth and rejuvenation. Remember to dispose of the pruned material properly to prevent the pests from spreading to other plants.

4. Horticultural Oil

Horticultural oils are effective in controlling a wide range of pests, including lerps. These oils work by suffocating the insects and disrupting their life cycle. Dilute a recommended horticultural oil according to the manufacturer’s instructions and spray it directly onto the affected parts of your Irish moss plant. Repeat this process every two weeks until the infestation is under control.

5. Insecticidal Soap

Another natural and safe option for controlling lerps on Irish moss is using insecticidal soap. This soap is specifically formulated to kill soft-bodied insects like lerps while being non-toxic to humans and pets. Mix the soap with water as per the instructions on the label and spray it onto the affected foliage. Make sure to cover both sides of the leaves thoroughly. Repeat the application once a week until the infestation subsides.

6. Biological Control

Biological control methods involve introducing natural predators or parasites that feed on lerps into your garden. Ladybugs and lacewings are beneficial insects that can help control lerp populations effectively. You can attract these predators by planting flowers such as daisies, marigolds, and yarrow, which provide them with nectar and shelter. Additionally, you can purchase beneficial insects online or from garden centers and release them onto your Irish moss plant.

7. Good Cultural Practices

Maintaining good cultural practices can go a long way in preventing and managing pest problems in your garden, including lerps on Irish moss. Ensure that your plant receives adequate sunlight, water, and nutrients to promote healthy growth. Avoid over-fertilizing, as excessive nitrogen can attract pests. Regularly remove any dead or decaying plant material to minimize potential breeding grounds for insects.

8. Quarantine and Inspection

If you have recently introduced new plants into your garden or have noticed lerps on other plants nearby, it is crucial to quarantine and inspect them. Lerps can easily spread from one plant to another, so isolating potentially infested plants will help prevent the infestation from spreading further. Thoroughly inspect the new plants for any signs of lerps before introducing them into your garden.

9. Neem Oil

Neem oil is another effective natural remedy for controlling lerps on Irish moss plants. This organic oil disrupts the feeding and reproductive behavior of pests, ultimately leading to their demise. Dilute neem oil according to the instructions on the label and spray it onto the affected parts of your plant. Repeat this process every two weeks until the infestation is resolved.

Conclusion

Getting rid of lerps on your Irish moss plant requires a combination of manual removal, pruning, and using appropriate pest control methods. Regular inspection and monitoring are essential to catch the infestation early and prevent further damage. By following these effective methods and maintaining good cultural practices, you can successfully eliminate lerps and restore the health and beauty of your Irish moss plant. Remember to always read and follow the instructions on any pest control products to ensure their safe and effective use.