• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Gardening
menu icon
go to homepage
  • Edible
  • Flowers
  • How To
  • Ornamental
  • Tips
  • Perennials
  • Berries
  • Fruits
  • Herbs
  • Mushrooms
  • Nuts
  • Vegetables
  • Composting
  • DIY Projects
  • Pests
  • Plant Diseases
  • Propagation
  • Seed Starting
  • Weeds
  • Homesteading
  • Canning
  • Preserving
  • Recipes
  • Indoor Gardening
  • Houseplants
  • Indoor Plants
  • Lawn
  • Shrubs & Trees
  • Succulents & Cactuses
  • Uncategorized
  • Privacy Policy
search icon
Homepage link
  • Edible
  • Flowers
  • How To
  • Ornamental
  • Tips
  • Perennials
  • Berries
  • Fruits
  • Herbs
  • Mushrooms
  • Nuts
  • Vegetables
  • Composting
  • DIY Projects
  • Pests
  • Plant Diseases
  • Propagation
  • Seed Starting
  • Weeds
  • Homesteading
  • Canning
  • Preserving
  • Recipes
  • Indoor Gardening
  • Houseplants
  • Indoor Plants
  • Lawn
  • Shrubs & Trees
  • Succulents & Cactuses
  • Uncategorized
  • Privacy Policy
×
Home » Tomato

Fast Action Tomato Blight Treatment Guide

Last Modified: Jul 19, 2023 by Mary Ward · This post may contain affiliate links · Leave a Comment

Fast Action Tomato Blight Treatment Guide pinterest image.
Fast Action Tomato Blight Treatment Guide pinterest image.
Fast Action Tomato Blight Treatment Guide pinterest image.
Fast Action Tomato Blight Treatment Guide pinterest image.

Very quickly, in real-time, here’s a fast and simple guide to managing tomato blight. This is a good quick reference if you need a fast primer on how to prevent tomato blight and a quick-look reference for what to do when you have blight in your tomato patch.

A gardener inspects a tomato patch decimated by blight
When blight starts to show its hand, you have to act fast. If conditions are moist, you might even want to act preventatively.

When it comes to tomato blight, fast action is the key to a cure! (Or at least, control that will give you a good, usable crop—it's almost impossible to actually “cure” your garden of tomato blight, but you can manage it, live with it, and overcome it to save your harvest.)

Jump to:
  • A Simple Guide to Tomato Blight Treatment
  • Prevention
  • Treatment
  • Stopping the Spread
  • Super-Quick Summary:
  • For More Details on Preventing and Treating Tomato Blight:

A Simple Guide to Tomato Blight Treatment

A gardener sprays preventive blight treatment on tomatoes
It is wise to have a fuller understanding of tomato blight prevention and management, but when time is of the essence, it helps to have a fast-action guide to refer to.

This guide breaks it down to just the basics of how to prevent and treat tomato blight.

Managing tomato blight can be broken down to three basic points of action: Prevention, Treatment, and Stopping the Spread.

Each of these points can be broken down to just a handful of action points (or less). If you follow these few points of action, you will have done most of what it is possible to have done to prevent and stop tomato blight.

Prevention

A gardener applies straw mulch below tomato plants
Two of the best ways to prevent tomato blight are mulching to create a barrier between plants and soil and spacing to improve air circulation.
  • Good Soil Nutrition
    Healthy plants will be able to fight off diseases better, and if the infection is not too great, it may be able to mostly stop the disease on its own.
  • Control Soil Contact and Soil Splash: Mulch!!
    For early blight, soil splashing up onto plants and low leaves is the primary point of contact and infection. Stopping soil splash is simple—create a barrier surrounding the plants that is between the soil and your tomatoes. Read: a mulch layer. Straw is a good choice.
  • Airflow
    Blight needs moisture and continued wetness in order to colonize to a point where it seriously affects the plant. Circulating air and good airflow speed up drying after dews and rain. Keep adequate space between plants in the row and keep space between the rows—a minimum of two feet is recommended, and three to four feet is even better. Air circulation is also increased through good pruning and removal of excessive foliage.
  • Moisture Control
    You can’t control the rain, but you can control the water you apply. For this, read no overhead watering. Water at the ground level with soaker hoses, which keep your plants completely dry. Fungi need water to live and grow.

Treatment

A gardener inspects blight on tomato plants
Your best defense when blight or blight-producing conditions are present is to treat plants with a quality organic product.
  • BOLO: Be On the Look Out
    Stay alert and be on the lookout for signs of fungal disease early. These mostly include tan to dark brown lesions on leaves and stems (depending on if you have early or late blight). Early blight spreads from the ground up; late blight is usually top-down.

    Pay special attention in years when conditions are ripe for fungal diseases. For early blight, these include warm, wet conditions and the presence of disease spores. For late blight, these include many cloudy days, continuous rains, heavy daily dew set, and cool temperatures. These are the two keys for late blight: lasting moisture and temperatures that are steadily in the 60 and 70 degrees (Fahrenheit) range (about 15 to 21 Celsius). When you know this is the year you are having, start looking for blight symptoms and, even better, apply fungicides as a preventative.
  • Apply an Antifungal Treatment
    When you know blight is starting, at the very sign, apply an antifungal treatment. Copper fungicide is the most recommended treatment for home gardens. It is a safe, organic product for children, pets, and most insects. (Do read product labels to know exactly how safe that product is for pollinators and beneficial insects and what, if any, precautions should be taken during and following application).

Stopping the Spread

A gardener reapplies antifungal product to tomatoes
Regular application of anti-fungal products is what will keep blight in check.
  • Reapply fungicides
    Apply fungicides as recommended to keep funguses under control. For most products, this means reapplying once every 7 to 10 days (about one and a half weeks). If you know you have blight, don’t wait to see how things go—do it!
  • Dry handling and harvesting
    Wait to work in your tomato patch until plants have dried from the morning’s dew or from rain (or from overhead watering, but we know now you’re not going to do that). Don’t prune, tie, or harvest plants when they are wet. That’s a sure way to spread blight spores.
  • Good Gardening Practices
    This is easy. Just be conscientious when you’re working in the garden. Do what your tomato patch needs you to do. This means using clean tools, disinfecting tools between plants (a quick alcohol dip will do it), regular pruning to keep air flowing, support and tying of tomato plants weekly as they grow, and general good care and attention that will help you spot the first sign of disease.

Super-Quick Summary:

  • Keep enough space between your tomato plants for air to circulate
  • Create a barrier with straw or mulch to stop soil splash
  • Supplemental watering needs to be ground-up only
  • Treat tomato blight with copper fungicide
  • In wet years apply an antifungal product as a preventative even before signs of disease are present. Neem oil or copper fungicide are good preventative options.

For More Details on Preventing and Treating Tomato Blight:

A gardener holds a blight-killed leaf in their hands
Use this article for fast-action reference; see our full list of prevention tips for more information.

On our site, you will find a full article on Tomato Blight Prevention and Treatment Tips. In it, we go into more depth about the what, how, and why of how tomato blight infections start and spread and what to do about it. This fast-action guide is meant as a quick reference. We do encourage you to read the full article, where you will gain more insight into how to live with tomato blight in your garden.

More Tomato

  • Sundried tomatoes with olive oil in a glass jar.
    15 Best Seeds to Grow for Sundried Tomatoes
  • A gardener picking up a green tomato from the vine.
    15 Tips for Storing Fresh Picked Garden Tomatoes
  • Anthracnose tomato disease on a green tomato.
    10 Common Tomato Diseases and How to Treat Them
  • An adorable brown squirrel on a tree eats a ripe tomato.
    15 Common Tomato Pests and How to Control Them

Sharing is caring!

1.5K shares
  • 1.4K

Reader Interactions

Leave a Reply Cancel reply

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

Primary Sidebar

Gardening site avatar

Hi, Fellow Gardeners! Welcome to the world of gardening. Enjoy the growing guides and growing tips our team of professional gardeners carefully selected.

April Gardening:

  • A gardener is plating a tomato seedling.
    6 Step Blueprint for New Vegetable Gardeners: Where to Start!
  • A basket full of freshly harvested Snow Peas.
    What’s the Difference Between Different Types of Peas?
  • Pea brush supporting young pea plants.
    Pea Brush: The Free and Easy Way to Support Pea Plants!
  • A gardener with a basket full of freshly harvested peas.
    6+ Easy to Grow Short Pea Varieties

Recent

  • Pea brush is used as support for peonies.
    Using “Pea Brush” to Support Perennials -- Easy and Free Flower Support!
  • Frost damaged rhubarb plant in the spring.
    Can You Eat Rhubarb That Gets Hit By Spring Frost?
  • Different types of vegetable transplants hardening off before planting.
    Does Hardening Off Make Garden Transplants Frost Hardy?
  • A glass jar of picked beets on a table.
    18 Best Fruits and Vegetables to Grow for Canning and Preserving

gardening.org is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate, we earn from qualifying purchases.

Footer

About

  • Privacy Policy

Contact

  • [email protected]

As an Amazon Associate, I earn from qualifying purchases.

Copyright © 2023 Gardening LLC.