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Dealing with Garlic Diseases

Gardening Guide: Glorious Garlic: From Garden to Table

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Dealing with Garlic Diseases

By Bill Dugan, Editor and Publisher

Withered garlic stems

Garlic diseases can be caused by bacteria, fungi, and viruses, and they can be spread through the soil, water, air, infected tools, animals, and even gardeners themselves.

Check your garlic plants for symptoms early and often, so you can treat plants before they are destroyed by disease and successfully manage symptoms. Here is a three-step approach to keeping vigilant:

  1. Research the risks. Research garlic diseases that are prevalent in your geographic area. When possible, buy disease-resistant seed garlic, usually these are cloves that have been heat-treated before sale.
  2. Examine daily. Check your plants daily to be sure no disease symptoms are present or emerging.
  3. Spot diseases early. Catch and treat diseases quickly, so your plants can recover and thrive.

Garlic diseases can affect the leaves, stems, or bulbs of the plants. Here are possible disease symptoms to look for to spot potential infection.

Leaves:

  • White powdery mildew or spots
  • Yellowed foliage
  • Curled leaves

Stems:

  • Yellowed or soft stems
  • Stunted growth

Bulbs:

  • Swelling
  • Rot or softness

Garlic with white rot

Common Garlic Diseases

Garlic is fairly resistant to diseases, but there are some that you should be aware of.

White Rot

Cause: Fungus

Symptoms:

  • Stunted growth
  • Early yellowing and death of outer leaves
  • Death of the remaining leaves and stem
  • Spots of white rot around base

How it spreads:

  • Seed garlic

Treatment:

  • Fungicide: tebuconazole, fludioxonil, and boscalid

Prevention:

  • Buy seed garlic from reputable suppliers
  • Apply a fungicide to soil before planting

Downy Mildew

Cause: Fungus

Symptoms:

  • Whitish, furry growth on the leaves
  • Yellow leaves
  • Dying young plants
  • Stunted growth of older plants.

How it spreads:

  • Sprinkler irrigation

Treatment:

  • Removal of infected plants and fungicide is the only treatment

Prevention:

  • Plant garlic with adequate space between them
  • Don’t overwater, and avoid sprinkler irrigation
  • Avoid moist soil
  • Apply a fungicide to soil before planting

Have you experienced any of these diseases with your garlic plants? Have you tried any of our remedies? Or do you have some of your own tips for treating and avoiding garlic plant diseases? Please share your ideas in the comments below.

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garlic, overwatering

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TABLE OF CONTENTS

  • Curator’s Corner
  • Introduction
  • Feature Articles

  • Types of Garlic
  • Growing Garlic from Cloves
  • Sun and Soil Requirements for Growing Garlic
  • Planting Garlic in the Ground, Raised Beds, or Containers
  • Storing and Preserving Garlic
  • Fertilizing, Watering, and Harvesting Your Garlic Plants
  • Choosing a Variety of Garlic to Plant
  • Dealing with Garlic Diseases
  • Dealing with Garlic Pests
  • Tips for Avoiding Diseases and Pests in Your Garlic Crop
  • Essential Tools and Equipment for Growing and Enjoying Garlic
  • Plant Profiles

  • California Late Garlic
  • Inchelium Red Garlic
  • Spanish Roja Garlic
  • Dujanski Garlic
  • Chesnok Red Garlic
  • Recipes

  • Garlic Gremolata
  • Chicken with 40 Cloves of Garlic
  • Garlic Scape Stir-Fry
  • Garlic Aioli
  • Garlic Balsamic Vinaigrette
  • Roasted Garlic
  • Additional Articles

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

  • The Easiest Fruits and Vegetables to Grow
  • How to Make Black Garlic
  • Growing Garlic from Cloves
  • Glorious Garlic—From Garden to Table

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