How to Get Rid of Borers on Periwinkle Plant

Periwinkle plants, also known as Vinca, are popular choices for gardeners looking to add a splash of color to their landscapes. These low-maintenance plants are prized for their vibrant flowers and ability to thrive in various conditions. However, one common problem that can plague periwinkle plants is borer infestation.

Borers are a type of insect that tunnel into the stems and trunks of plants, causing damage and potentially killing the affected plant. If you notice wilting leaves, dying branches, or holes in your periwinkle plant, it’s likely that borers are the culprits. Fortunately, there are several effective methods to get rid of borers and save your periwinkle plant.

Identify the Type of Borer

Before taking any action, it’s important to correctly identify the type of borer infesting your periwinkle plant. Different borers have different life cycles and habits, so an accurate identification will help determine the most effective treatment.

The two most common borers affecting periwinkle plants are the clearwing moth borer and the flatheaded borer. The clearwing moth borer is a wasp-like insect that lays its eggs on the bark of the plant. The larvae then burrow into the stems and feed on the plant tissue. The flatheaded borer is a beetle whose larvae also tunnel into the stems and trunks of plants.

Prune Affected Areas

Once you’ve identified the type of borer infestation, pruning is an essential step in getting rid of borers on your periwinkle plant. Start by removing any branches or stems that show signs of infestation. Cut back to healthy tissue, making sure to dispose of the pruned material away from your garden to prevent further spread.

Inspect the remaining parts of the plant carefully for any visible borers or entry points. Use a sharp knife or pruners to remove any visible borers, making sure to cut them in half to prevent them from escaping and causing further damage.

Apply Insecticides

Insecticides can be an effective means of controlling borer infestations on periwinkle plants. However, it’s important to choose the right type of insecticide and apply it correctly to minimize any potential harm to beneficial insects and the environment.

For clearwing moth borers, a systemic insecticide containing imidacloprid is recommended. These insecticides are absorbed by the plant and provide long-lasting protection against borers. Follow the instructions on the product label carefully and apply the insecticide as directed.

For flatheaded borers, an insecticide containing bifenthrin or permethrin is usually effective. These contact insecticides should be sprayed directly onto the affected areas of the plant. Again, make sure to follow the instructions on the label and take appropriate safety precautions while applying the insecticide.

Implement Cultural Practices

In addition to pruning and using insecticides, implementing certain cultural practices can help prevent future borer infestations and promote the health of your periwinkle plants.

Regular watering: Borers are more likely to attack weak and stressed plants, so proper watering is essential for keeping your periwinkle plant healthy. Water your plants deeply and regularly, making sure the soil is evenly moist but not waterlogged.

Fertilization: Providing adequate nutrients to your periwinkle plants will help them resist borers and other pests. Use a balanced fertilizer specifically formulated for flowering plants, following the instructions on the package.

Mulching: Applying a layer of organic mulch around the base of your periwinkle plants can help retain moisture, suppress weeds, and insulate against extreme temperatures. Avoid piling mulch too close to the stems as this can create a favorable environment for borers and other pests.

Proper pruning: Regular pruning can help maintain the shape and health of your periwinkle plants. Remove any dead or dying branches promptly to prevent borer infestations.

Monitor regularly: Keep a close eye on your periwinkle plants for any signs of borer activity. Early detection is key to preventing widespread damage. Inspect the stems, trunks, and leaves regularly, looking for entry holes, wilting, or discoloration.

Conclusion

Borer infestations can be a frustrating problem for periwinkle plant owners. However, with proper identification and timely action, it’s possible to get rid of borers and save your beloved plants. Remember to prune affected areas, apply appropriate insecticides, and implement cultural practices that promote plant health. By taking these steps, you can enjoy vibrant and healthy periwinkle plants in your garden for years to come.