දියමලන්කෑමේ රෝගය හදුනා ගනිමු | How to Identify Damping Off Disease in Field |

Описание: This video is introduction to damping off disease

Damping off disease is a common term used to describe a variety of fungal diseases that affect seeds, seedlings, and young plants. It's a major problem in nurseries and greenhouses where high humidity and poor air circulation create ideal conditions for the growth of these fungi. Damping off can affect a wide range of plants including vegetables, flowers, and ornamental plants.

Symptoms:

Pre-emergence damping off: This occurs before the seedlings emerge from the soil. The seeds may rot and fail to germinate, or if they do, the seedlings are weak and may collapse.
Post-emergence damping off: This occurs after the seedlings have emerged. The seedlings may have water-soaked lesions at the base of their stems, causing them to wilt and fall over. The affected area is typically constricted and can look pinched.
Causes:

Fungal pathogens: Various fungi, such as Rhizoctonia, Pythium, and Fusarium species, are common causes of damping off. These fungi thrive in moist environments and attack vulnerable seedlings.
Poor drainage: Excessively wet soil due to poor drainage can create a perfect environment for the growth of damping off fungi.
Overwatering: Watering seedlings too frequently can lead to overly damp conditions, promoting fungal growth.
Crowded seedlings: Overcrowding plants can reduce air circulation, creating a humid environment conducive to damping off diseases.
Prevention and Control:

Use sterilized soil: Start with clean, sterilized potting mix to reduce the risk of introducing damping off fungi to your plants.
Proper watering: Water seedlings from the bottom to avoid wetting the foliage. Allow the soil surface to dry between waterings.
Good ventilation: Provide adequate air circulation around seedlings by using fans or ensuring proper spacing.
Avoid overcrowding: Space seedlings appropriately to promote air circulation and reduce humidity.
Sanitation: Clean and sterilize pots, trays, and gardening tools to prevent the spread of fungi.
Fungicides: If damping off is a recurring problem, consider using fungicides, but always follow the instructions carefully.
It's important to note that prevention is key when it comes to damping off disease. Once damping off has occurred, it's challenging to save the affected seedlings. Therefore, focusing on creating conditions that discourage fungal growth is crucial to protect your plants.

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