The marijuana leaf can suffer from Black Dot disease, which is also known as Black Spot disease. Either way this disease is caused by Pseudomonas bacteria or can be caused by some fungus species, like Asterina, Asterinella, Asteroma and others.
The marijuana leaf struck with this disease will have black spots appear on the leaf and can have tones of yellow. This bacteria or fungus infection can cause distortion of the buds and cause the marijuana leaves to appear straggly. This is an infection that can affect the marijuana plant when conditions are warm and humid, which means it can occur on outdoor or indoor marijuana leaves.
One of the other contributors to this disease is environmental stress that can strike the cannabis plants.
One way to possibly avoid this infection of the marijuana leaves and buds is to choose disease resistant seeds
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