Homemade Spray to Control Rust on Plants


Numerous types of fruit trees, nut trees, decorative bushes, and shrubs may be afflicted with rust infections. Rust is a common issue with roses, but it may also affect other blooming plants such as carnations, sunflowers, and others. Rust may leave patches on leaves, or it might cause the whole leaf to become yellow or brown. Rust is a disease that causes leaves to fall off prematurely, as well as curl and wither the foliage. Rust disease may also cause cankers, galls, and stunted development in addition to its other symptoms. In order to assist in preventing the development of rust infections, fungicides may be applied either during the dormant stage of the plant, when there is no leaves present, or in the early spring. Fungicides already designed for commercial use are easily accessible, but it is also possible to acquire the individual components of fungicide sprays and prepare them at yourself.

Aspirin Mixture

Mixing two aspirin with one quart of regular water makes for the easiest homemade fungicide there is to make. For instance, eight aspirin pills are used to make one gallon of spray. Make use of aspirin pills, uncoated, 325 milligrammes in strength. After thoroughly combining the dissolved aspirin and the water, transfer the solution to either a pump sprayer or hand-held spray bottles and shake well. Utilization of this combination in the early spring is possible. Spray the foliage thoroughly, making sure to cover the undersides of the leaves as well. If there is a chance of rain in the next couple of days’ forecast, you should be sure to take precautions to prevent the fungicide from being washed away.

Baking Soda Mixtures

Baking soda is a useful basis for fungicides, but it may cause salts to accumulate to dangerous amounts on plants. This can kill the plants. Maintain a close eye on treated plants for any symptoms of salt buildup, and water heavily to assist in the removal of any excess salt. In order to create an efficient DIY fungicide, the University of Florida IFAS website suggests using one ounce of horticultural oil and four teaspoons of regular baking soda in one gallon of water. The mixture should then be stirred. After a thorough mixing, pour the liquid into a sprayer. In the beginning of spring, it is important to treat the plants on a weekly basis in order to help stop the spread of rust and any other diseases that may already be present in the garden.

Mixing one tablespoon of baking soda, one tablespoon of light-colored vegetable (cooking) oil, and one tablespoon of mild dishwashing detergent into one gallon of water is another method for making fungicide. This method calls for oil, which helps spread the fungicide and prevents it from accumulating in the soil as quickly.

Bordeaux Mixture

The Bordeaux combination is an efficient method for eradicating fungus as well as bacteria that have colonised the garden. Copper sulphate is combined with lime and water to make the liquid, which is sprayed on plants to prevent rust and other diseases. The liquid also includes lime. Both copper sulphate and hydrated lime may be easily obtained from garden stores and nurseries respectively. Due of its capacity to cause damage to the leaves of trees after they emerge from their winter slumber, Bordeaux is most effectively used in the winter as a spray on dormant trees.

In order to produce one gallon of Bordeaux, combine one gallon of water with three and a third teaspoons of copper sulphate and ten tablespoons of hydrated lime. After giving the mixture a good shake to ensure that it is properly combined, pour it into a spray bottle or a pump sprayer. Spray the soil surrounding the plants as well as the plants themselves until it is completely soaked.

Sulfur Mixtures

Sulfur is freely accessible and may be simply blended at home to be used as a fungicide against rust and other diseases. It has been used for many centuries as a fungicide against rust. Before rust can form, sulphur must be administered; thus, the best time to apply it as a preventative treatment is in the early spring, when the temperature has not yet reached and will not remain over 80 degrees Fahrenheit. Certain types of plants, including berries and cucurbits, are sensitive to the presence of sulphur. Sulfur may be purchased either as a liquid, a wettable powder, or as a dust, and the instructions for combining each form of sulphur are unique. Read the product label to find the instructions for mixing and applying the product, as well as to ensure that it is suited for the plants you have. Lime-sulfur compounds have an odour similar to that of rotten eggs, and they should not be applied on vegetation. To use as a dormant spray, mix up this fungicide and apply as directed.


Spraying plants and other surfaces with Bordeaux mixture on days when there is no breeze might result in a blue tint being left behind. Bordeaux combination, in contrast to a great number of other fungicides, does not often disappear when it rains.

Always do a spot test before using homemade fungicides on the whole plant to ensure that the combination will not cause any harm to the plant. Spray a few leaves, wait at least one day, and then examine them to look for any bad responses.