• My account
  • Cart
    • Email
    • Facebook
    • Instagram
    • Pinterest
    • YouTube

The Coeur d'Alene Coop

Raising Chickens and Urban Gardening

  • Home
  • About Our Heirlooms
    • About Candace
  • Garden Consulting
  • Shop
    • NEW/RETURNING for 2025
    • NEW! Culinary Planters
    • NEW! Flowers
    • Grown from Organic Seed
    • Heirloom Tomatoes
    • Heirloom Peppers
    • Heirloom Vegetables
    • Cool Season Vegetables
    • Herbs
    • Container/Small Space
    • My Favorites!
  • CdA Coop Blog
    • Gardening
      • Soil and Compost
      • Garden Seed Series
      • Growing Tomatoes Series
      • Growing Garlic Series
    • Backyard Chickens
    • Recipes
    • Garden Glossary
      • How Often to Divide Perennials & Winter Care
      • Q/A Sheet: How to Decide What to Grow in Your Garden
      • Ripe for the Picking: A Quick List of Common Fruit and Vegetables to Ripen On or Off the Vine
      • Vegetable Plant Family Chart
      • Seed Starting Charts
  • Contact Us
You are here: Home / Gardening / Simple Steps to Prevent Disease in the Garden

August 10, 2022 By Candace Godwin 1 Comment

Simple Steps to Prevent Disease in the Garden

Just about every gardener has experienced some type of disease in their garden. Whether it’s early blight on tomatoes, mosaic virus on cucumbers, or powdery mildew on peas, it’s bound to happen.

Early blight in tomatoes
Early Blight on tomato leaves.
Mosaic Virus Cucumber
Mosaic Virus on cucumber.
Powdery mildew in peas | The Coeur d Alene Coop
Powdery Mildew on peas.

It doesn’t mean you’ve failed as a gardener – it’s just part of gardening – and it’s a great learning opportunity. What caused the disease? What could be done to prevent it? Is there a cure?

The reality is that it is far easier to prevent disease in the garden than it is to try and cure or eliminate it. If fact, many common garden diseases don’t have a cure – so prevention is the key. 

One way to prevent disease is to select and grow plant varieties that are resistant to specific diseases. Many hybrid vegetable varieties are bred for disease resistance and you’ll find that information in the plant’s description or tag.

You may have noticed the letters “A” or “VF” on tomato plant tags – this signifies the variety is resistant to Alternaria (early blight) or Fusarium Wilt and Verticillium Wilt.  Keep in mind that disease-resistant does not mean disease-proof.

Disease resistant tomato plant tag | The Coeur d Alene Coop
Hybrid vegetables are often bred for disease resistance. This ‘Better Boy’ is resistant to Verticillium Wilt, Fusarium Wilt and Nematodes are designated by the V, F, N on the tag.

The good news is that many diseases can be prevented by simply following a few basic gardening best practices:

  • Always water at the base of the plant and avoid overhead watering. Wet foliage is a welcoming environment for many pathogens including early blight and powdery mildew. If foliage is wet from rain or even morning dew, avoid handling the plants.
  • Water in the morning hours to allow foliage to dry during the day and reduce disease risk.
  • Mulch around the base of plants. This helps prevent soil-borne diseases like early blight and other fungal diseases where pathogen spores in the soil can make contact with leaves. This also helps keep plant roots cool and conserves moisture.
  • Prune suckers and crossing stems for good air flow and to remove any leaves or stems that touch the soil. Proper pruning can help prevent the spread of soil-borne and foliar diseases.
Base watering | The Coeur d Alene Coop
To prevent soil-borne and foliar diseases, always water at the base of plants.
Straw mulch around tomatoes | The Coeur d Alene Coop
Mulch not only helps to prevent soil-borne diseases, it also keeps roots cool and conserves moisture.
Lower leaves pruned from tomato | The Coeur d Alene Coop
Pruning the lower leaves and stems from tomatoes can help to prevent early blight and other fungal diseases.
  • Avoid cultivating around or disturbing plant roots. Bacterial diseases need an entrance point into the plant. Roots damaged from cultivation can provide an access for pathogens.
  • Follow plant spacing recommendations. Crowding plants limits air circulation and becomes a haven for foliar diseases like powdery mildew. Crowded plants also easily spread disease to other plants.
  • Practice crop rotation and avoid planting the same vegetable or vegetable family in the same location year after year. This is very important to prevent the buildup of soil-borne diseases and to avoid insect infestations.
  • Practice good sanitation by spraying pruners and snips with rubbing alcohol after removing any diseased plant material. Wash your hands – you can spread disease too! And finally, tidy-up and remove diseased plant debris to the trash and not the compost bin.

Diagnosing plant diseases can be challenging — even for experts. Many diseases exhibit similar conditions, such as leaf spotting and yellowing or browning leaves.

It can be challenging to determine some diseases. This is Early Blight (Alternaria) on a tomato.
Septoria Leaf Spot | The Coeur d Alene Coop
Septoria Leaf Spot is often confused with Early Blight — the symptoms look similar.

My advice is if your once-healthy plants begin to show signs of disease, take photos and collect a sample of the affected leaf, stem, or fruit and visit you local County Extension or Master Gardener’s office. These professionals can help identify the problem and offer various methods for prevention and control. This is a free resource that will save you time, money, and worry. 

Filed Under: Gardening, Growing Tomatoes Series Tagged With: alternaria, crop rotation, disease prevention, disease resistant vegetables, early blight, garden watering, gardening best practices, hybrid vegetables, mulching, plant spacing, powdery mildew, pruning tomatoes, septoria leaf spot, tomato diseases

Get Garden Tips & More

« Podcast #12: Common Diseases and Pests of Tomatoes and How to Prevent Them
How to Identify Common Insect Pests in Tomatoes »

Trackbacks

  1. How to Identify Common Diseases in Tomatoes — The Coeur d'Alene Coop says:
    August 11, 2022 at 11:12 am

    […] Prevention really is the key. It’s far easier to prevent disease than it is to try and cure or eliminate it. In fact, many tomato diseases don’t have a “cure.”  Meaning there isn’t a chemical application to “stop and reverse the disease” once it starts. Many diseases can be prevented by following basic gardening best practices (click to read). […]

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recent Posts from The Coop

  • How To Garden Without Pesticides: Natural Ways to Fight Pests May 2, 2025
  • Heirloom, Hybrid, GM-Oh My! Understanding These Gardening Terms April 18, 2025
  • Budget Gardening Hacks: Grow More for Less with These Simple Tips April 4, 2025

Search Our Plants Here

Shop by Category

Cart

the coop on facebook!

The Coeur d'Alene Coop The Coeur d'Alene Coop is at 2nd Street Chicken Ranch.

13 hours ago

The Coeur d'Alene Coop
Day #3 of plant pick up! Garage: full of plant orders. Greenhouse: full of plant orders. Garden: full of plants to be packed. Nine more days to go. Happy times for everyone! 🌻🌿🍅🌶🫑🥬🫛#thecoeurdalenecoop #heirloomvegetables #growyourownveggies #homegrownisbest #organicgardening ... See MoreSee Less

Photo

View on Facebook
· Share

Share on Facebook Share on Twitter Share on Linked In Share by Email

the coop on instagram!

The Coeur d Alene Coop

thecoeurdalenecoop

#thecoeurdalenecoop
@thecoeurdalenecoop
Heirloom tomatoes 🍅🍅
Organic gardening 🥕🌶
& Urban chickens! 🐔🐓

Day #3 of plant pick up! Garage: full of plant ord Day #3 of plant pick up! Garage: full of plant orders. Greenhouse: full of plant orders. Garden: full of plants to be packed. Nine more days to go. Happy times for everyone! 🌻🌿🍅🌶🫑🥬🫛

#thecoeurdalenecoop 
#heirloomvegetables 
#growyourownveggies 
#homegrownisbest 
#organicgardening
Load More... Follow on Instagram

Join the Flock!

Sign up to get gardening & chicken keeping tips delivered to your inbox.

Copyright © 2025 The Coeur d'Alene Coop · Coeur d'Alene, Idaho 83814 · Privacy Policy · Log in
Website Design: Godwin Marketing Communications LLC