Identification: What causes downy mildew on basil leaves?

Hey everyone,

On my birthday my best friend gifted me with some herbs seeds because of my love towards planting. Among which there were Basil Black seeds which I planted according to the plantation method provided. As the basil started growing I noticed some black spots which are called downy mildew on every leaf of the herb.

I am unable to figure out what might have caused this.

Please help me with a solution to prevent it as early as possible.

 

Basil Downy Mildew

 

Welcome to these Forums, ishila22! I don't think we have ever had a question from someone in Hyderabad before but I hope we'll hear from you again in the future. We are always interested in what is going on horticulturally in different parts of the world.

 

I've had success treating mildew with a mixture of baking soda detergent and water. iirc it was 2 tablespoons baking soda 1 teaspoon detergent and 1 gallon of water.
take it with a grain of salt tho and test any new chemicals on a single leaf or so to see if the plant suffers any negative reactions before treating the whole plant.

 

AFAIK, mildew is often result of a warm and moist environment. A basil is happy in a dry air. Your climate could be just a bit too humid. You did not wrote if your basil is indoors or outdoors.
If outdoors, then some protection from precipitation could help.
If indoors, then air dehumidifier could help.