What is botrytis and how to control it?

Botrytis, also called gray mold or gray rot , is a pathogenic fungus that can attack more than 220 varieties of plants, both indoor and outdoor or greenhouses.

One of the causes of the appearance of botrytis is moisture, since it is essential for its development. This means that the higher the humidity level in the environment, the more chances your plants may have to get this fungus.

The ideal temperature for botrytis to appear is between 17 and 25º C , although it can also arise at much higher temperatures. What causes the fungus is the rot in the buds, the base of the stems, the fruits, the flowers and the leaves. It attacks any plant, although it loves those that have tender, fleshy stems and very soft leaves.

Botritis penetrates the spores by wounds that cause chafing, insects and hail. This means that after a hailstorm, plantations are likely to be treated the next day to prevent botrytis.

You may also be interested in:  Fungi in plants that you should know

Symptoms of gray mold

As I said before, all parts of the plant can be attacked by gray mold and the first visible sign will be both the change in color and texture of the plant.

In the leaves of the same a necrosis occurs, while the stem can turn brown, weak and ulcerated when attacked. However, the most common is to find the botrytis in the bud, turning it pale, gray, dry, granulated and cottony on the outside.

How to control botrytis?

  • Avoid wounds in plants.
  • Be very careful with pruning and when you do a thinning of the leaves.
  • Protect fragile plants from heavy rains.
  • Reduces watering, as well as ambient humidity. Improves soil drainage.
  • Kalanchoe, cineraria and cyclamen are some of the indoor plants most sensitive to gray mold, so you should water them down, placing them on a plate with wet pebbles.
  • Put the pots in a ventilated place to avoid excess moisture.
  • Cut the diseased parts of the plant, or remove the entire plant completely so that it does not affect the rest.
  • Clean the tools you use.
  • Add fungal paste to the wounds when pruning and thinning leaves.
  • Perform a preventive treatment every 10-12 days with systemic fungicides.
  • A good product to combat botrytis is iprodione, a fungicide and nematicide.
  • Never plant a plant of the same species in the soil where you have removed a plant affected by gray mold, since the fungus can remain in the soil and therefore infect the new one.

We recommend you read:  The most common garden pests

In the following video you will know some tips for the control of botrytis in the vine :

Ecological remedies against botrytis

Although botrytis is a difficult fungus to control , even with chemical fungicides, there are some ecological remedies that are effective such as nettle broth and wormwood broth. Keep reading to learn how to do them.

  • To make the nettle brothyou will have to use a proportion of 100g of the whole plant of fresh nettle (minus the root) per liter of water, or 20g per liter of being a dry plant. After 15 days of fermentation, the broth will be ready to be used.
  • To prepare the wormwood brothyou will have to submerge both the stem and the leaves in a proportion of 100g per liter of water if it is fresh wormwood, or else 15g per liter if it was dried. Let stand for 12 days before spraying the plant affected by botritis with this ecological remedy.

It should be noted that these two wines can be used preventively, or if the plant has already been affected by this fungus.

If this post has served you, either, do you know any other ecological remedy or know in some other way to fight gray mold , leave your comments.

Leave a Comment