In order to lend you a hand and answer your question of why the black leaves in some of your plants, we have prepared this simple guide so that you can learn more about the possible causes, how to eliminate them and how to prevent the appearance of the spots on plant leaves. Its appearance is usually the first symptom of some type of disease or plague that is reducing the health of the plant.
We encourage you to take a look at this EcologíaVerde article on Why do black spots appear on the leaves of plants? to keep your plants free of these, because in addition to giving them a bad appearance, they can also kill them if they are not given the corresponding treatment.
Causes of black spots on plant leaves
Although in most cases the black spots are usually related to the presence of fungi in the plants or the beginning of plant leaf diseases, may be due to other factors. These are some of the causes that the leaves of your plants have black spots:
natural death of leaves
You should know that even in the case of perennial plants, the leaves have a limited life expectancy. The leaves may show this appearance because they have completed their life cycle and not because they have the presence of any disease.
It is the result of placing the plant in direct and continuous exposure to sunlight. This can be increased if you also water your plants during the central hours of the day. To avoid this we recommend that you move your pots during the hours of greatest sunlight and that you water them using a sprayer.
Taking into account these cases that occur naturally or due to a bad location of your plants, we are going to talk a little more about fungi in plants. These are undoubtedly one of the main causes of the leaves ending up with those black spots that are so annoying and that harm its health so much.
appearance of fungi
Fungi appear when the plant is exposed to excessive moisture. They are stains that initially take on a brownish coloration, to finally end up with a dark color. In addition to its rounded shape, it is easy to recognize the presence of fungi by the appearance of aphids, tiny insects that are attracted by the sweet taste of the leaves and flowers that are exposed by the action of the fungus. In fact, it is advisable to treat the plague before eliminating the fungi to ensure that the treatment used will be completely effective. These symptoms may be due to the presence of different fungi such as mildew or powdery mildew or related diseases such as rust or anthracnose.
How to remove black spots from plant leaves
Next, we are going to give you some basic tips to know how to treat your plants that have black spots on the leaves. In most cases, as we have already mentioned, it will be because of the appearance that we have focused on how to remove fungus from leaves.
Step 1 – Remove Infected Leaves
To ensure the health of your plant, the first thing you should do is prune off all infected leaves as quickly as possible as fungi spread through direct contact. Make sure that the tools you are going to use for this treatment are disinfected every time you cut a new leaf. You can use a liquid solution made up of one-fifth bleach and four-fifths water.
Step 2: Treat the infected areas
To avoid cutting all the infected leaves of the plant, especially those that already have a yellowish appearance, we can try to recover them using some remedies to prevent the disease from spreading. The simplest thing is to use fungicides, but we want to remind you that whenever you buy this type of product, make sure that they are made with an organic compound base. You can also use neem or neem oil, or prepare other home remedies with which to spray the leaves periodically.
In this other article you can learn how to make homemade fungicides.
Step 3 – Rake and Discard Infected Leaves
If your plants are indoors, we advise you to always keep the soil as aerated as possible and to remove all infected leaves. Place these in a well-sealed bag to throw them away and to prevent agents such as wind or animals from spreading the fungi again.
How to prevent black spots on plant leaves
doWhy do the tips of the leaves turn black?? Usually, when only the tips of the leaves turn black, it may be due to a excess moisture in the soileither due to poor drainage or excessive irrigation.
However, the appearance of black spots on the leaves is due in the vast majority of cases to the appearance of fungi in our garden, cultivation or pots. Once the fungi have appeared, they can be quite difficult to eliminate, so prevention is always more appropriate than cure, as popular wisdom says. Here are some steps you can take to prevent the appearance of fungi in your plants:
- Keep the plant in an airy and dry area, unless it is a species that does not tolerate currents or expressly requires a lot of environmental humidity.
- Provide a substrate rich in nutrients that give the plant strength to fight against fungi and diseases. Worm humus is a great option as a fertilizer, ecological and very rich in healthy microorganisms.
- Always water your plants adding water to the substrate and trying not to wet their leaves or flowers. These parts tend to be susceptible to fungus or disease if kept wet for too long, and most plants only need water in their substrate or soil.
- Make sure the substrate is light and offers good drainage. If you have the plant in a pot, make sure the container has drainage holes and that you remove any excess water about 20 minutes after watering from the saucer below.
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