Like humans, cannabis plants are vulnerable to threats from a variety of microorganisms. While human diseases are typically caused by viruses or bacteria, cannabis diseases most often result from fungi. Fungi are a separate kingdom of organisms characterized by their diffuse networks of branching filaments. This feature allows them to easily spread throughout an environment, affecting the other organisms in their paths. Understanding cannabis plant diseases caused by fungi allows you to keep your plants safe.
Cannabis Plant Diseases Caused by Fungi
Perhaps the most prevalent of the plant diseases caused by fungi is gray mold. Also known as botrytis cinerea, gray mold prefers the temperate environment in which cannabis plants thrive. Gray mold often begins as a white growth on the plant before darkening to become gray in color. It affects stems, roots, and leaves of the plant. Botrytis consumes nutrients that come from the wounded or dying plant tissue. As it gains strength, it begins to consume healthy tissue as well.
As its name suggests, powdery mildew is a fungal disease that appears as a white powder, typically on the leaves of plants. Powdery mildew grows more quickly when plant leaves become too damp. It then spreads to affect other parts of the plant, including buds.
Fusarium wilt is another of the plant diseases caused by fungi. This type of fungus is caused by Fusarium oxysporum, which can attack seedlings or mature plants. Affected plants look droopy and soon lose their leaves. They may fail to form buds, inhibiting your cannabis production.
Damping off affects cannabis plants in their earliest stages, making it one of the most harmful plant diseases caused by fungi. This fungus attacks the roots of small seedlings, causing them to fail to thrive. The seedlings soon fall over and never grow to adulthood. Damping off is more prevalent in overly moist growing conditions, making it important for cannabis producers to carefully monitor watering of seeds.
The fungus that causes brown blight thrives in temperate environments, causing small round spots on the leaves of plants. Soon, these lesions take over the plant and cause it to lose its leaves and die.
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