Black mold is a fungal disease that affects onion plants, causing black spots to appear on the bulbs and reducing their quality. This article from the “WORLD OF PLANTS” website discusses how to prevent black mold disease on onions and methods of control.
Causes of black mold disease on onions
Disease name: black mold on onions
Scientific name: Aspergillus niger
Type of disease: Fungal
Disease family: Trichocomaceae(Fungus Aspergillus niger that attacks onion plants)
The fungus lives on decaying organic matter such as plant debris and is a weak pathogen that generally does not affect bulbs. Black rot of onions commonly occurs after harvest, affecting stored fruit. It can also occur in the field when bulbs are in their final stages of maturity.
Symptoms of black mold disease on onions
The initial symptoms of the infection appear in the upper part of the onion plant in the form of black spots or lines around the top of the onion and perhaps on the sides, or the entire neck area may be black. Then it moves on to invade the inner peels of the onion.
Controlling black mold disease on onions
- Chemical control: Using a fungicide containing tridimenol reduces the spread of the disease.
- Organic control: Storing and transporting fruits at temperatures below 15 degrees Celsius and at low humidity. Installing a good drainage system in the field also helps slow the growth of fungi.
Preventive measures for black mold disease on onions
Be careful when handling the plant during harvesting, handling, and transportation to reduce wounds to avoid infection with fungi. Good fertilization enhances the plant’s resistance to disease. Sterilize agricultural tools before use. Install a good irrigation and drainage system to reduce soil moisture.
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Sources:
Black Mold -UNIVERSITY OF CALIFORNIA AGRICULTURE AND NATURAL RESOURCES
Onion Black Mold Info: Managing Black Mold On Onions – gardeningknowhow
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