White mold is a fungal disease that affects onion plants, leading to rotting of the roots and bulbs. This article from the World of Plants website explains how to identify white mold disease on onions and ways to prevent it.
Causes of white mold on onions
Disease name: white mold fungi on onions
Scientific name: Stromatinia cepivora
Type of disease: fungal
Disease family: Sclerotiniaceae (Development of the disease on onion fruits)
Fungus transmitted Stromatinia cepivora It reaches the roots through the soil, where it can live for many years. There are no onion varieties resistant to this fungus.
Symptoms of white mold on onions
The initial symptoms appear on the leaves, where they become yellow in color and appear wilted. The fungus also attacks the roots, causing them to rot. It then invades the onion fruits, where a thin white fungal growth appears at the base of the bulb, after which it becomes covered with small, round, black, seed-like structures called sclerotia. .
Development cycle of white mold on onions
The disease is transmitted through soil contaminated by agricultural tools, shoes, or irrigation and rain water. It may be present in the soil, where it remains dormant until it senses the growth of any member of the onion family and attacks it.
Suitable conditions for the spread of white mold on onions
Mushrooms need humid weather conditions and temperatures ranging below 20 degrees Celsius, so winter is the growth season for these fungi.
Losses resulting from the spread of white mold on onions
The fungus attacks the roots, causing them to die and the plant to wilt. As the infection ages, the entire plant dies, so the disease causes significant losses in the quantity and quality of production.
Control of white mold on onions
Organic control: Do not fertilize the soil to limit the spread of the disease and remove infected plants and dispose of them away from the field.Chemical control: Use a fungicide containing iperidone or tebuconazole.ا
Preventive measures: White mold on onions
Avoid excessive nitrogen fertilization. Use special seedlings for agriculture that are heat-treated. Sterilize agricultural tools before use. Install a good irrigation and drainage system to reduce soil moisture. Plowing the soil helps reduce the amount of fungi present in the soil.
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