Cinnamon is the main enemy of fungus and midges!
Sprinkle the soil with a pinch of spice after replanting - the roots will avoid rot, and the pest larvae will die.
Dissolve 1 teaspoon in a liter of water and spray the leaves: this will protect against powdery mildew better than chemicals.

Bonus: the aroma of cinnamon stimulates the growth of new shoots. But do not overdo it with the amount of fragrant spice - an excess of spice "puts the plants to sleep".
It is enough to carry out the procedure with cinnamon once every 2 months.
To get a super stimulant, you can add honey to cinnamon. Mix 1 teaspoon of cinnamon with 2 drops of honey and 200 ml of water.
Spray the cuttings before planting - roots will appear in 5 days.
If you grow orchids, try sprinkling the root cuts with cinnamon the next time you prune.
This will disinfect the wounds and prevent infection.
By the way, this spice can act as an ant trap. Draw a circle around the pot with cinnamon. Insects hate this smell and will avoid the plant.
And the aromatic additive will also benefit cacti. Add a pinch of cinnamon to the soil when replanting. This will protect against rot and speed up the flowering of succulents.
Caution! Do not use cinnamon for seedlings. As gardeners have found out from their own experience, essential oils slow down the growth of young shoots.