In the list of worries that crowd the minds of farmers, who have to learn how to fight crop enemies season after season, autumn plant diseases rank directly at the top.

Annoying and difficult to eliminate, autumn diseases are made to wreak havoc in the vegetable garden, requiring direct and targeted intervention. Given their pest nature, these specific diseases need a lot of attention and care to disappear completely, with the hope of not finding them again the following year.

Fortunately, today we will discover together how to recognise and treat autumn plant diseases, from do-it-yourself remedies to the most recommended and useful solutions for getting rid of pest fungi for good. We will guide you through the main types, the typical symptoms of diseased plants and the most effective remedies.

Ready? Let’s get started!

How to recognise a diseased plant

During autumn, it is essential to be able to recognise the symptoms of a diseased plant in order to intervene early and preserve its health for as long as possible.

But what are the typical symptoms of plant diseases in autumn?

The symptoms generally associated with plant diseases can vary depending on the case and the specific characteristics of your garden. There are areas of the garden that are often more prone to the development of harmful diseases – areas where the soil is too wet or too dry – as well as areas that tend not to be affected.

To help you identify the different types of plant diseases in autumn, we have collected the most common symptoms below, which are easy to recognise and observe:

  • Spots and discolourations on the leaves:

The leaves of diseased plants may often show irregular spots, discolourations or changes in colour. This type of situation may indicate the presence of fungal diseases such as white mould or rust;

  • Wilting and weakening of leaves:

When affected by specific diseases, the leaves of vegetable garden plants may appear wilted, yellowed or weakened. In most cases, weakening could be a sign of stress caused by diseases such as root rot;

  • Mould or powder on the leaves:

The presence of mould, black mould or powdery deposits on the leaves often indicates the attack of harmful fungi;

  • Rotten flowers and fruits:

In some cases, flowers and fruits may develop dark spots, rot or mould. All this is a sign of disease infestation such as grey rot;

  • Deformities or abnormal growths:

Some diseases can cause deformities or abnormalities in plant growth, such as distorted leaves or malformed flowers;

  • Early leaf loss:

Diseased plants may start losing their leaves prematurely due to specific diseases that weaken the plant structure;

  • Growth slowdown:

Root diseases may hinder normal plant growth and development, leading to a consistent slowdown;

  • Honeydew and the presence of sucking insects:

Honeydew is a sticky substance produced by sucking insects such as aphids and mealybugs. Its presence can encourage the development of harmful moulds and fungi.

In all cases, careful observation is crucial for recognising the symptoms of autumn plant diseases at an early stage. Regularly monitoring the condition of plants and taking appropriate remedies can make all the difference in ensuring a healthy and flourishing garden even during this particular transition season.

The most common plant diseases in autumn

Having reached this point, all that remains for us to do is to ask ourselves which are the most common diseases that affect plants in autumn and, above all, how we can recognise them in time – before it is too late!

Autumn, with its mantle of colourful leaves, brings with it a number of challenges for all farmers and plant lovers. During this season, many plants are exposed to common diseases that can affect their health and beauty.

Here, then, are some of the most common diseases that afflict plants in autumn and the recommended remedies to get rid of them permanently and safely.

1. White mould (Oidium)

Let us start with white mould, an extremely common and well-known type.

White mould is caused directly by fungi that develop under humid conditions and moderate temperatures. It appears as a whitish powder on the leaves, which can wither and fall off (often very quickly).

To prevent it, it is essential to maintain good air circulation around the plants and reduce humidity. In the event of infection, treatments with fungicides with a high sulphur concentration can be particularly effective.

2. Root rot (Phytophthora)

The expression ‘root rot’ (or apical rot) is used to refer to a specific type of autumn plant disease. In detail, we are talking about a fungus that affects the roots of plants, causing the leaves to turn yellow and the plant to wither.

To prevent this disease, it is important to avoid water stagnation and ensure that the soil is well drained. In case of infection, the use of specific fungicides can help contain the damage and keep the fungus away as much as possible.

3. Leaf rust (Puccinia)

Leaf rust is a disease that manifests itself as small rusty spots on leaves, which can spread and impair photosynthesis.

To get rid of rust effectively, simply remove the infected leaves and use copper-based fungicides. Together these two elements can quickly contain the infection and restore the plant to its original state.

4. Grey rot (Botrytis)

We continue with ‘grey rot’, a fungal disease that affects flowers and fruit, causing mould and – as you can imagine – rot.

In the autumn, avoiding over-watering and maintaining good air circulation can prevent the onset of grey rot. However, in the event of infection, it is important to remove the affected parts as quickly as possible and apply specific fungicides.

5. Anthrax (Colletotrichum)

Anthrax is a fungus that mainly affects ornamental plants, causing dark spots to form on leaves and flowers.

As we have seen above, keeping plants well cleansed of plant debris can significantly help prevent infection. Similarly, the use of copper-based fungicides can be particularly effective in controlling the spread and future occurrence of anthrax.

6. Black mould (Fumaggine)

Finally, we come to one of the autumn plant diseases that most annoys farmers: black mould.

This type of disease develops through the appearance of honeydew (produced by aphids, mealybugs and other sucking insects). Once again, we are talking about a fungus that can lead to the formation of a black layer on the surface of leaves, impairing photosynthesis.

In these cases, controlling the responsible insects and cleaning the leaves are crucial to prevent black mould. When you see the first spots appear, take action as quickly as possible to nip the problem in the bud.

Natural remedies against plant diseases

If you are planning an organic and ecological vegetable garden, you may have wondered how plant diseases can be treated naturally without the use of chemicals.

Fortunately for you and all the plants in your garden, there are numerous natural and do-it-yourself remedies that allow you to treat diseased plants in the autumn without the use of harmful chemicals. By adopting these extremely useful ecological practices, you can protect your garden in a sustainable way, while preserving the beauty and vitality of your plants during the autumn.

So let’s get to the heart of the matter and take a closer look at the most effective remedies against autumn diseases of garden plants:

  • Baking soda:

One of the most effective methods of treating diseased plants in autumn is definitely the use of baking soda solutions, which acts as a natural fungicide.

When mixed with water, the baking soda creates a solution that can be sprayed on leaves affected by diseases such as white mould;

  • Garlic or chilli:

Garlic or chilli infusions can turn into powerful natural repellents against pests. These solutions can easily be created at home, helping to protect plants from infestations of aphids and other harmful pests;

  • Compost:

The use of well decomposed compost and manure is another environmentally friendly strategy to improve plant health. These materials provide essential nutrients and help strengthen plants’ natural defences against diseases and pests;

  • Neem:

Neem, oil extracted from the seeds of the neem tree, is another outstanding natural remedy. Due to its antifungal and insecticidal properties, it can be used to combat a wide range of plant diseases and protect against insect attacks.

In addition, a good practice to prevent diseases is always crop rotation. This unique method involves varying the types of plants grown in certain areas, thus reducing the risk of accumulation of specific pathogens in the soil.

At the same time, proper irrigation management is essential to avoid water stagnation, which can encourage the development of root diseases (diseases that affect plant roots). Proper irrigation, which aims to keep the soil moist but not saturated, helps to keep the roots healthy and strong.

Preventing autumn diseases in the vegetable garden

How can I prevent disease in my plants during the autumn season?


If you too have this question nagging at you and do not know how to take care of your vegetable garden plants during every season of the year, this is the right place. Here is our guide to preventing autumn plant diseases, explained step by step and point by point.

  • Cleaning and removing debris:

Regularly removing dead leaves, branches or other organic matter that may accumulate around plants is essential. As is often the case, this debris can be a breeding ground for fungal and bacterial diseases;

  • Smart water management:

During the autumn, it is very important to maintain a constant watering balance. The general advice is always to avoid water stagnation, which can encourage the development of root diseases.

Also, always remember to water the plants at root level to prevent the leaves from getting too wet and running the risk of developing mould;

  • Crop rotation:

As mentioned earlier, crop rotation is among the most popular and well-known prevention methods.

Following the rules of crop rotation means planting different species in areas previously occupied by similar plants. Effectively, reducing the accumulation of specific pathogens in the soil prevents the spread of diseases;

  • Right amount of air and light:

Ensuring good air circulation around the plants is essential. Regular pruning and maintaining open spaces help prevent favourable conditions for diseases such as white mould;

  • Use of natural fertilisers:

It is always best to prefer organic fertilisers and well-rotted compost. These types of products provide essential nutrients for plants, strengthening their natural defences against diseases and insects;

  • Constant monitoring:

Watching plants closely for early signs of disease is certainly very important. Early intervention can make all the difference in preventing and controlling infections.

By following this guide to preventing plant diseases in autumn, you will be able to protect the health of your vegetable garden and enjoy vigorous and vital plants all year round. Remember. Prevention is the key to a healthy and flourishing garden.


Once we have come to the end of this interesting journey, it is safe to say that prevention is the key to healthy plants even in the autumn.

Good irrigation management, proper plant cleaning and the targeted use of fungicides can help prevent and control the most common diseases. Closely monitoring plants and taking early action in the event of signs of infection is essential to preserve the beauty and vitality of the garden during the autumn, helping crops to grow in the right way.

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