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How to Get Rid of Borers on Hop Plant

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Updated: July 5, 2023

Introduction

Hop plants are a vital component in brewing beer, providing the essential flavors and aromas that beer enthusiasts crave. However, these plants are not immune to pests, and one common problem hop growers face is borers. Borers are insects that tunnel into the stems of hop plants, causing damage and potentially killing the plant if left untreated. In this article, we will explore effective methods to get rid of borers on hop plants and protect your valuable crop.

Identifying Borers

Before we delve into the solutions, it is important to identify the presence of borers on your hop plants. Common signs of borer infestation include wilting or stunted growth, holes or sawdust-like frass on the stems, and visible entry or exit points on the stems. It is crucial to act swiftly upon noticing these symptoms to prevent further damage.

Prevention is Key

The best way to deal with borers is to prevent their infestation in the first place. Here are some preventive measures you can take:

  1. Sanitation: Regularly clean up fallen leaves, stems, and other plant debris around your hop plants. Borers often lay eggs in decaying plant material, so removing their potential breeding grounds reduces the risk of infestation.

  2. Inspect New Plants: Before introducing new hop plants to your garden or field, carefully inspect them for any signs of borers or other pests. Avoid purchasing or transplanting infested plants as they can introduce pests to your existing crop.

  3. Proper Plant Spacing: Provide adequate spacing between hop plants to promote good air circulation. This reduces humidity levels and creates an unfavorable environment for borers and other pests.

  4. Monitoring: Regularly inspect your hop plants for early signs of borer activity. Look for tiny holes or frass near the base of the stems and any wilting or stunted growth. Early detection allows for prompt action and increases the chances of successful treatment.

Natural Remedies

If you notice borers on your hop plants, there are several natural remedies you can try before resorting to chemical solutions. These remedies are environmentally friendly and pose minimal harm to beneficial insects:

  1. Manual Removal: Carefully examine the infested stems and locate the entry holes. Using a sharp knife or pruners, carefully cut into the stem below the hole to remove the borer larvae. Be sure to destroy the larvae to prevent reinfestation.

  2. Beneficial Nematodes: Beneficial nematodes are microscopic worms that prey on borers and other pests. They can be purchased from garden centers and applied to the soil around your hop plants. Follow the instructions provided by the manufacturer for proper application.

  3. Botanical Insecticides: Certain botanical insecticides, such as neem oil or pyrethrin-based sprays, can be effective against borers. These products are derived from plants and have low toxicity to humans and beneficial insects. Apply them according to the label instructions, focusing on the stems where borers are present.

  4. Traps: Borers are attracted to certain scents, making them susceptible to traps. You can create homemade traps by coating sticky substances like petroleum jelly or tree tanglefoot on small stakes near your hop plants. The borers will get stuck on these traps, reducing their population.

Chemical Solutions

If natural remedies fail to eliminate borers or if the infestation is severe, you may need to resort to chemical solutions. When using chemical insecticides, it is important to follow all safety precautions and read the product labels carefully. Here are a few options:

  1. Systemic Insecticides: Systemic insecticides are absorbed by the plant and circulate within its tissues, making them effective against borers that are hidden inside the stems. Products containing imidacloprid or cyfluthrin can be applied to the soil or foliage, following the instructions provided.

  2. Contact Insecticides: Contact insecticides provide immediate control upon contact with the pest. They should be sprayed directly on the infested stems and thoroughly cover all affected areas. Be sure to choose an insecticide specifically labeled for borer control and follow the recommended application rates.

Post-Treatment Care

After treating your hop plants for borers, it is important to provide proper care to ensure their recovery and prevent future infestations:

  1. Watering: Maintain proper watering practices to prevent stress on the plants. Adequate water supply helps the plants recover from borer damage and promotes healthy growth.

  2. Fertilization: Apply a balanced fertilizer to provide essential nutrients for plant recovery. This will enhance the plant’s natural defense mechanisms and support its overall health.

  3. Regular Monitoring: Continue monitoring your hop plants for any signs of reinfestation or new pest activity. Early detection allows for swift action, minimizing potential damage.

Conclusion

Borer infestations can be detrimental to hop plants, but with prompt action and proper preventive measures, you can effectively get rid of these pests and protect your valuable crop. Remember to prioritize prevention, utilize natural remedies when possible, and only resort to chemical solutions as a last resort. By following these guidelines, you can ensure healthy hop plants and a successful brewing season.

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