Skip to Content

5 Best Tomato Plant Fungicides – A Buyers Guide

Tomatoes are pretty easy to grow and take care of.  If your tomato plants have been attacked by pests, there are lots of ways to save them. But with a fungal infection are a different ball game.

Most fungal infections are so severe that they cannot be cured once they cross a certain stage so you need to take proper precautions and have the right plant fungicides at hand.



What are Fungicides?

Fungicides are used to fight fungal infections that may affect the growth of a plant in a negative way.

They are used for controlling fungal infections, damaged plants, and especially rust, blight, and mildew

Fungicides are easily available in solid and liquid forms. Depending on the type of fungal infection, plant requirement, and growth stage, you can select the fungicide. 

The common active ingredient in fungicide is sulfur and it is usually present at a concentration of 0.08%.

Apart from the liquid form, you can also get solid fungicides, but they are usually very toxic. In powder form, you will get a concentration of up to 90% sulfur in the fungicide. 

I have listed some of the best fungicides that are recommended for tomato plants below for your reference. 


Best Tomato Plant Fungicides


Bonide Mancozeb Fungicide Concentrate

This is a great fungicide that is very good for tomato leaf spots

Apart from tomatoes, you can use it for other plants like Potatoes, cucumbers, melons, grapes, apples, onions, and roses. 

The WHO declared this product safe and it is not toxic at all. 

The main ingredients are zinc and mancozeb, which help in fighting fungal infections and is promoting growth. 

The best way to use this fungicide is to use it in a tank spray. You need to add 3 tbsp. of the fungicide with one gallon of water and mix it to make a liquid spray. 

You can easily treat late tomato blight, early tomato blight, botrytis, rust, and downy mildew with this spray.



  • Very good for a wide range of tomatoes
  • Good for integrated management of pests
  • Helps with healthy growth of the plant through zinc 



  • Instructions for mixing and concentration proportion is missing 
  • Excess can be toxic

Don’t forget to buy this fungicide here.


Bonide Copper Fungicide RTU

This fungicide is good for early tomato blight but you can use it for other plants as well. 

Some of the other plants that you can use this fungicide for are roses, nuts, herbs, vegetables, and turf. 

This fungicide contains copper salt, fatty acids, copper sulfate, and copper octanoate. 

It helps with curing the issues related to tomato rust, leaf curl, downy mildew, lead spots, black spots, late tomato blight, and anthracnose. 

This fungicide comes in a spray form, so it is easy to use.

Use this product until your plant reaches a height of 3 feet (92 centimeters).

The direct application is fine, there is no need for dilution.



  • Ready to use, no mixing required
  • No need for a spray tank
  • Control insects and helps in promoting plant growth. 



  • The solution is not good for the roots of the plant
  • Toxic for animals 
  • Rain might wash the spray

Take a look at this product here.


Garden Safe Fungicide Ready-To-Use

This fungicide contains myclobutanil triazole, and it is also good for treating downy mildew. 

Apart from tomatoes, you can also use this fungicide for other plants such as roses, nuts, herbs, shrubs, vegetables, and turf. 

It helps with black tomato spots, brown patches as well as early and late tomato blight. 

An easy way to use this is to mix it with water. The instructions on how to apply it are on the label, so you can use it accordingly.

It is toxic, so you need to wear a protective mask and gloves.



  • Very good for early prevention and cure
  • Doesn’t runoff easily even with the rain
  • Offers 2-week good protection 



  • Needs serious protection because of toxicity
  • Not an organic fungicide
  • Not best for near-harvest tomatoes

Don’t forget to make your purchase here.


Neem Bliss Neem Oil Fungicide

Organic, safe, and effective, this fungicide is perfect for beginners who have no clue about fungicides in general. It is a great remedy for powdery mildew on tomato plants. 

It can also cure rust of tomato, tomato scab, early and late tomato blight as well as black tomato spots. This fungicide contains Azadirachtin that fights fungicide as well as promotes growth.

Apart from tomatoes, you can also use it for other plants, including fruits, nuts, herbs, shrubs, vegetables, and ornamentals.

The best way to use it is to mix two tablespoons of oil in 1 gallon of water. Some people even mix it with mild liquid and soap.

Just spritz it on the surface and it will be sufficient for 2 weeks. 

A patch test is necessary because this is an organic solution but some plants may show some serious signs. 



  • It is a natural and organic remedy
  • The best option for people who are into organic gardening 
  • Low toxicity can help with promoting the growth 



  • Applying in direct sunlight might burn the plant
  • It has a very strong odor
  • Applying directly to the skin might hurt

Buy this amazing product here.


Daconil Fungicide Concentrate

This fungicide is best tomato leaf spot for septoria leaf spot on tomato plants. 

Apart from curing septoria leaf spot, it also helps in controlling fungal infections like early and late tomato blight, black mold, grey lead mold, grey lead spot, and rust of tomato, Algae, powdery mildew, and botrytis. 

Chlorothalonil is the fungicide’s active ingredient, which helps in curing fungicide as well as promotes plant growth. 

Apart from tomatoes, you can use it for other plants as well. Some of the other plants include flowers, fruits, shade trees, and vegetables. 

The overall use is very easy but you need special protection to ensure that it doesn’t come in direct contact with your body and skin. 

Wear full sleeves, protect your eyes, wear gloves as well as wear a mask. 

The mixing is easy. You need to dilute the mixture with water and add it to tank spray. 

Spraying during hot weather can cause harm so avoid spraying in hot weather. 

Apart from this, apply the solution thoroughly on the plant surface as this solution can get washed off by rain. 

It is toxic, so if there are animals nearby, you need to take precautionary measures. Another important thing is to avoid spraying when it is windy.  



  • It is best for early treatment because it is a non-systematic fungicide
  • Prevents against a wide variety of diseases
  • Very good for growth



  • Very toxic
  • Not an organic fungicide
  • Get swashed off by rain

Take a look at this fungicide here.

Based on the type of fungal infection and the stage of the infection, there are two main types of fungicide. 


Type of Fungicides

There are systematic fungicides and contact fungicides.


Systematic Fungicides

Systematic fungicide is used for treating fungal infections in the long run. 

This kind of fungicide is absorbed by the plant, and when the fungal infection starts, the anti-fungal effect kicks in.

This kind of fungicide moves through the plant tissues and protects both mature and new parts of the plant. 


Contact Fungicides

Contact fungicide helps in fighting the fungus only when it comes in contact with it, hence the name. 

Once the fungal infection has attacked the plant and has infected it, you can spray this type of fungicide to prevent any further damage. 


Tomato Fungal Infections

Fungal infections are not just of a single type, there are many different types of infections unfortunately and they have different effects on the tomato plant. 

Some of the common tomato plant fungal infections are listed below. 


Tomato Early Blight

This infection is caused by Alternaria solani. You will see small dark spots near the ground on the older leaves. Then spots will spread to newer leaves as well. 

The spots are round, brown, and can be as big as half an inch. 

They are usually round and if the infection gets worse, you will see that leaves will turn brown, and they will fall off eventually. Some of the dead leaves might even stick on the stem. 


Tomato Late Blight

Tomato late blight is caused by Phytophthora infestans. This infection attacks the fruit directly. 

You will see big dark brown spots that are firm and round; they will start slow and cover the whole fruit. 

Tomato late blight often appears near the winter season when the weather is wet and humid.

In humid weather, entire fields turn brown and this can become irreversible. 


Septoria Leaf Spot

Cause of Septoria lycopersici, this fungal infection can be seen on the lower leaves at the start, and it will spread to the upper leaves as well. 

You might notice that lesions and spots emerge and form blotches. Leaves then turn brown and rusty. 

You will see that the stems and pods of the plant may also develop these spots, which will affect its growth. 


Buckeye Rot

Caused by Phytophthora parasitica, this fungal infection attacks the fruit as well as the leaves. You will see an irregular brown spot on the leaves and on the stem.

The spots are water-soaked and you can easily spot them. Leaves will wilt and the plant might collapse.

The tomatoes might become very soft, full of water, and will rot eventually.


Anthracnose Fruit Rot

Caused by various species of fungi in the genus Colletotrichum, this fungal infection can be characterized by irregular-shaped spots and blotches on the leaves. 

It mainly affects the young leaves and will result in tan brown spots. The leaves will soon be curled up and be distorted. 

However, if these spots appear on the mature leaves of a tomato plant, they don’t curl up or wilt.

In case of severe infection, the plant completely goes to waste. 



The biggest problem with fungal infections is that you need to take precautions, if it is observable it is often too late. 

A good fungicide will help you prepare for the worst. To avoid any serious damage to your tomato plants, you need to prepare your plant with the help of systemic fungicides. 

I suggest you choose the fungicide based on the soil and the level of moisture in the soil. 

Usually, fungal infections start from the soil and reach up the tomato plant causing serious damage. 

Look for a fungicide that targets multiple types of fungal infections rather than just one type. Also, follow the safety precautions while applying the fungicide as they can be poisonous.

Proper research and timely application will save your tomato plant from any irreversible damage. 

Author Bio

Daniel Iseli

Taking care of houseplants and gardening are my greatest passions. I am transforming my apartment into an urban jungle and am growing veggies in my indoor and outdoor garden year-round.