Updated: July 24, 2023

If you have a yerba mate plant, you may have encountered a common problem known as lerps. Lerps are small, scale-like insects that attach themselves to the leaves of the plant and can cause damage if left untreated. In this article, we will explore what lerps are, the damage they can cause, and most importantly, how to get rid of them.

Understanding Lerps

Lerps are tiny insects that belong to the family Psyllidae. They are commonly found on plants such as citrus trees, eucalyptus, and yes, yerba mate plants. These insects have a unique way of protecting themselves – they secrete a sugary substance that hardens into a protective shell or lerp. The lerps serve as a shield for the insects and their eggs, making it difficult for predators or pesticides to reach them.

Identifying Lerp Damage

Lerps typically feed on the sap of the yerba mate plant, causing damage to the leaves. The first sign of lerp infestation is the appearance of small, white or yellowish bumps on the underside of the leaves. These bumps are the lerps themselves.

As the infestation progresses, you may notice other symptoms such as leaf discoloration, curling, or wilting. If left untreated, lerps can weaken the plant and hinder its growth and productivity.

Natural Methods to Get Rid of Lerps

When it comes to dealing with lerps on your yerba mate plant, there are several natural methods you can try before resorting to chemical pesticides. These methods not only help eliminate lerps but also promote overall plant health.

1. Pruning Infested Leaves

Start by inspecting your yerba mate plant and identifying leaves with lerp infestations. Use clean pruning shears or scissors to remove these leaves. Make sure to dispose of the infested leaves properly, away from the plant to prevent reinfestation.

2. Introducing Beneficial Insects

Another effective way to control lerps naturally is by introducing beneficial insects that prey on them. Ladybugs, lacewings, and parasitic wasps are known to feed on lerps and can help reduce their population. You can attract these beneficial insects to your garden by planting flowers such as daisies, marigolds, and yarrow.

3. Using Horticultural Oil

Horticultural oils are a safe and effective solution for controlling lerps. These oils work by suffocating the insects and disrupting their life cycle. Dilute the horticultural oil according to the manufacturer’s instructions and spray it directly onto the affected leaves. Make sure to cover both sides of the leaves thoroughly.

4. Neem Oil Spray

Neem oil is derived from the seeds of the neem tree and has insecticidal properties. Mix neem oil with water according to the instructions on the bottle and spray it onto the lerps and infested areas of the yerba mate plant. Neem oil not only kills lerps but also acts as a deterrent for other pests.

5. Companion Planting

Companion planting involves growing certain plants together to benefit each other. In the case of yerba mate plants, planting herbs such as mint, basil, or rosemary nearby can help repel lerps and other insect pests.

Chemical Control Options

If natural methods fail to control the lerp infestation on your yerba mate plant, you may consider using chemical pesticides as a last resort. However, it is essential to read and follow the instructions on the pesticide label carefully.

When choosing a pesticide, look for ones specifically formulated for psyllids or lerp control. These pesticides often contain ingredients such as imidacloprid or pyrethroids that are effective against lerps. Apply the pesticide according to the recommended dosage and frequency, taking care not to overapply.

Preventing Future Lerp Infestations

Prevention is always better than cure when it comes to dealing with pests. Here are a few tips to help prevent future lerp infestations on your yerba mate plant:

  • Regularly inspect your plants for signs of infestation.
  • Keep your plants healthy by providing adequate sunlight, water, and nutrients.
  • Avoid over-fertilizing as excessive nitrogen can attract pests.
  • Remove weeds and debris from around the yerba mate plant as they can harbor pests.
  • Practice crop rotation if possible to disrupt the life cycle of lerps and other pests.
  • Encourage natural predators by providing habitats such as birdhouses or insect hotels.

Conclusion

Lerps can be a nuisance for yerba mate plant owners, but with the right approach, they can be effectively controlled. Start with natural methods such as pruning infested leaves, introducing beneficial insects, or using horticultural oils. If necessary, chemical pesticides can be used as a last resort. By taking preventive measures and maintaining plant health, you can minimize the risk of future lerp infestations and enjoy a thriving yerba mate plant.