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Dealing with Fennel Diseases

Gardening Guide: Fennel: How to Grow this Herb and Spice in Your Garden

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Dealing with Fennel Diseases

By Norann Oleson

Leafless fennel plant, likely disease-stricken

Leafless fennel plant, likely disease-stricken

Like most crops, fennel is susceptible to certain diseases, which are in turn promoted by pest damage. Here are some of the diseases you should look out for:

Leaf blight

Symptoms: Small flecks on leaves which develop a halo and expand into tannish brown spots. These lesions will cause leaves to wither, curl, and die.

Leaf blight can be introduced through infected seeds and spread by wind or splashing water. This disease usually occurs on younger foliage first.

How to Handle Leaf Blight
Plant disease-free seed and rotate crops regularly. Infected plants should be removed and thrown away instead of composting. You may also need to apply a fungicide spray.

Downy Mildew

Symptoms: Yellow spots on the upper surface of leaves, white fluffy growth on the underside of leaves, and lesions that become darker as they mature.

Downy mildew affects young, tender leaves. The emergence and spread of this disease is prompted by prolonged leaf wetness.

How to Handle Downy Mildew
Plant disease-free seed, do not overcrowd, and avoid planting fennel near or rotating with other umbelliferous specimens such as dill, parsley, carrots, celery, and parsnips.

Powdery Mildew

Symptoms: Powdery growth on leaves, flowers, and stalks, and leaves becoming yellowish in color. Severe fungal infections can cause fennel flowers to become distorted.

Powdery mildew can spread long distances in the air and the emergence of this disease can be encouraged by high humidity and moderate temperatures (60 to 80 degrees F). This fungal infection is typically most severe in shaded areas.

How to Handle Powdery Mildew
Plant mildew resistant varieties of fennel and avoid excess fertilization. Destroy infected plants (do not compost) and treat the area with a fungicide.

How do you prevent diseases on your fennel plants? Please share your techniques with us in the comments.

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fennel, planting fennel

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TABLE OF CONTENTS

  • Curator’s Corner
  • Introduction
  • Feature Articles

  • A Word About the Types of Fennel
  • Fennel is Not Such a ‘Friendly Plant’
  • Getting Started with Your Fennel Plants
  • Soil, Sun, and Watering Requirements for Your Fennel
  • Dealing with Fennel Pests
  • Dealing with Fennel Diseases
  • Essential Tools and Equipment for Growing and Enjoying Fennel
  • Plant Profiles

  • Romanesco Heirloom Fennel
  • Orion Fennel
  • Cantino Fennel
  • Zefa Fino Fennel
  • Dulce Fennel
  • Bronze Fennel
  • Trieste Fennel
  • Recipes

  • Ice Cream Sundae with Nuts and Fennel
  • Fennel and Kale Pancakes
  • One-Pot Chicken with Fennel and Tomatoes
  • Potato-Fennel Gratin
  • Rigatoni with Fennel and Capers
  • Shaved Fennel Salad
  • Roasted Fennel
  • Additional Articles

  • Nutrition Facts about Fennel
  • Health Benefits of Fennel
  • Resources about Fennel
  • Fennel Glossary
  • Related Articles

  • How to Turn Anyone Into a Fennel Lover
  • Fabulous Fennel: All You Need to Know about Planting, Harvesting, and Cooking this Unique Flavorful Food

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