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How to Get Rid of Crusader Bugs on Hollyhock Plant

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Updated: June 12, 2023

Introduction

Hollyhocks are beautiful, tall flowering plants that add a touch of elegance to any garden. However, like any other plant, hollyhocks are susceptible to insect infestations. One common pest that can wreak havoc on your hollyhock plants is the crusader bug (Murgantia histrionica). These bugs feed on the sap of the plant and can cause significant damage if left untreated. In this article, we will discuss effective strategies to get rid of crusader bugs and save your hollyhock plants.

Identifying Crusader Bugs

Before we delve into the methods of eradication, it is crucial to correctly identify crusader bugs. Also known as harlequin bugs, these insects have a distinct appearance that sets them apart from other garden pests. Adult crusader bugs are about half an inch long and have a shield-shaped body. They are brightly colored with orange or red markings and black accents. The nymphs, on the other hand, are black with white or yellowish markings.

Prevention is Key

As with any pest problem, prevention is always better than a cure. Here are some preventive measures you can take to minimize the risk of crusader bug infestation:

  1. Inspect new plants: Before introducing new hollyhock plants into your garden, thoroughly inspect them for any signs of crusader bugs or other pests. If you notice any, it’s best to avoid purchasing them to prevent the spread of infestation.

  2. Plant hollyhocks in the right location: Hollyhocks thrive in full sun and well-drained soil. By providing them with optimal growing conditions, you can help strengthen their natural defenses against pests like crusader bugs.

  3. Maintain good garden hygiene: Regularly remove weeds, fallen leaves, and other debris from around your hollyhock plants. These can serve as hiding spots and breeding grounds for crusader bugs.

  4. Encourage natural predators: Attract beneficial insects, such as ladybugs and lacewings, to your garden by planting nectar-rich flowers nearby. These natural predators will help keep the crusader bug population in check.

Natural Remedies

If you notice crusader bugs on your hollyhock plants, it’s important to take immediate action to prevent further damage. Here are some effective natural remedies to combat these pests:

  1. Handpick and squash: If the infestation is small, you can manually remove the bugs by handpicking them off the plants. Drop them into a bucket of soapy water to ensure they won’t return.

  2. Neem oil spray: Neem oil is a natural insecticide that can repel and kill crusader bugs. Dilute neem oil according to the instructions on the label and spray it directly onto the affected plants. Be sure to cover both sides of the leaves and stems thoroughly.

  3. Garlic spray: Garlic has insecticidal properties that can deter crusader bugs. To make a garlic spray, crush a few cloves of garlic and mix them with water. Let the mixture sit overnight, strain it, and then spray it onto your hollyhock plants.

  4. Diatomaceous earth: Diatomaceous earth is made from fossilized remains of tiny aquatic organisms called diatoms. It acts as a desiccant and dehydrates insects upon contact. Sprinkle a thin layer of food-grade diatomaceous earth around your hollyhocks to create a barrier against crusader bugs.

Chemical Control

If natural remedies fail to eliminate the crusader bug infestation, you may need to resort to chemical control methods. However, it is important to use chemical pesticides responsibly and follow the instructions on the label. Here are a couple of options:

  1. Pyrethrin-based insecticides: Pyrethrin is a natural insecticide derived from chrysanthemum flowers. It is effective against a wide range of garden pests, including crusader bugs. Follow the instructions on the label to apply pyrethrin-based insecticides to your hollyhock plants.

  2. Insecticidal soap: Insecticidal soaps are made from potassium salts of fatty acids and work by suffocating insects. Spray insecticidal soap directly onto the crusader bugs, ensuring complete coverage. Repeat the application as necessary.

Conclusion

Crusader bugs can quickly become a nuisance and cause significant damage to your hollyhock plants if left unchecked. By implementing preventive measures, such as regular inspection and good garden hygiene, you can minimize the risk of infestation. If you do notice crusader bugs on your hollyhocks, natural remedies like handpicking, neem oil spray, garlic spray, or diatomaceous earth can effectively control the population. Only resort to chemical control if all else fails, and be sure to use pesticides responsibly. With these strategies in place, you can protect your hollyhock plants and enjoy their beauty throughout the growing season.

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