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Dealing with Lavender Pests

Gardening Guide: Lovely Lavender

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Dealing with Lavender Pests

By Norann Oleson

Rosemary beetle on a lavender plant

Rosemary beetle on a lavender plant

Pests on your lavender, left unchecked, can damage and destroy your developing plants. Keeping a close watch on your plants during regular daily inspections will help you spot any pests before they can do irreparable harm. Healthy lavender can bounce back from pest damage if you catch the pests quickly. Luckily, there aren’t a lot of pests with a taste for lavender.

A couple notes about prevention:

  • Don’t overwater.
  • Place sticky traps to catch pests early.

Spot the symptoms of lavender plant pests

Check leaves, bulbs, and flowers for these symptoms that come from pests on the prowl.

On Lavender Leaves

Symptoms Pest
White “foam” at base of leaves Spittlebugs
Leaves are stippled or yellow on top; tiny, almost transparent eggs and webbing on underside Spider mites
Stunted or deformed, yellowing leaves Nematodes
Plants turn yellow and stop growing Leafhoppers
“Honeydew” and white specks on underside of leaves; sooty mold Whiteflies

 

On Lavender Roots

 

Symptoms Pest
Yellowish cysts on roots; split roots Nematodes

How to treat pests on lavender

Here are some proven ways to get rid of pests on your lavender. Choose the best treatment for the type of pests invading your plants.

  • Pick off the pests. Use your garden gloves to remove the pests by hand. After removal, destroy pests by drowning them in a bucket of soapy water or crushing them with your foot. Handpicking isn’t efficient or practical for very small pests, but works well with larger pests.
  • Blast them. If you spot invaders like aphids, give them a good blast with the garden hose. Chances are good the neighborhood birds will notice and come eat your pests.
  • Apply insecticidal soap. Insecticidal soap is organic. The potassium salts in insecticidal soap help remove an insect’s protective waxes, causing destruction of insect membranes and killing them. Mix the soap with water to create your solution and apply directly to insects on any plants. While insecticidal soap is less apt to affect other organisms, certain plants might be sensitive to the soap and can suffer leaf burn.
  • Apply horticultural oils. Combine plant- or petroleum-based oils with water to produce horticultural sprays. Neem oil, for instance, is derived from seed extracts of the neem plant. Oil-based sprays block an insect’s air holes, interfere with an insect’s metabolism, disrupt insect feeding, and inhibit insect growth. Like insecticidal soaps, horticultural oils can cause plant injury if not properly diluted.
  • Make your own pest spray. You can make your own pest spray with benign materials. Mix 1 tablespoon of baking soda, 1/2 teaspoon of a mild dish detergent, and 2 1/2 tablespoons of olive oil in a gallon of water to make a solution that will repel all kinds of bugs, as well as a fungicide for blight and mildew on lavender plant leaves. Shake it well in your bottle before spraying and repeat every week for it to be continuously effective.
  • Diatomaceous Earth (DE). Sprinkle DE at base of plants and between plants. Many pests cannot cross over this barrier without dying.

Do pests attack your lavender every year? How do you handle removing them—and even preventing them in the first place? Please tell us how you treat your lavender to avoid pests.

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Tags

lavender, lavender roots, plant pests

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TABLE OF CONTENTS

  • Curator’s Corner
  • Introduction
  • Types of Lavender
  • Growing Lavender from Seeds, Seedlings, Cuttings, or Layering
  • Sun and Soil Requirements for Growing Lavender
  • Planting Lavender in the Ground or in Raised Beds
  • Growing Lavender in Containers
  • Watering, Weeding and Fertilizing your Lavender Plants
  • Harvesting your Lavender
  • Storing and Preserving Your Lavender
  • Pruning your Lavender & Preparing for Winter
  • Dealing with Lavender Diseases
  • Dealing with Lavender Pests
  • Essential Tools and Equipment for Growing and Enjoying Lavender
  • Plant Profiles

  • Provence Lavender
  • Royal Velvet Lavender
  • Betty’s Blue Lavender
  • Melissa Lilac Lavender
  • Munstead Lavender
  • Hidcote Lavender
  • Recipes

  • Lavender Crispy Rice Treats
  • Strawberry Lavender Sorbet
  • Herbes de Provence
  • Lavender Shortbread Cookies
  • Lavender Lemonade
  • Additional Articles

  • Nutrition Facts about Lavender
  • Health Benefits and Home Remedies of Lavender
  • Resources about Lavender
  • Lavender Glossary
  • Related Articles

  • Is Lavender an Annual or Perennial?

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