Major cannabis diseases

Like any plant, hemp is at risk of hundreds of diseases. Among them are infectious, non-infectious, bacterial, viral, fungal … Yes, the list is endless. It is important for the grower to spot the problem in time and take action as soon as possible. Cannabis diseases arise under the influence of many factors: be it external conditions or a pest virus.

Bacterial and infectious diseases

Gray rot appears in all areas of the cannabis except the root. “Ideal conditions”: low temperature + high humidity. You will recognize it first by the weeping areas covered with a gray bloom, which later turn into a black fine mesh. The affected stem begins to break, and the leaves and buds rot.

Tip: when watering, avoid getting liquid on the cannabis leaves and ventilate the room more often;
Treatment: spraying with Bordeaux liquid.

With white rot, the plant turns yellow, begins to wither and wither. It spreads in high humidity, outdoors after heavy rains. Leaves fall off before they can rot; at the base of the stem, practically on the border with the ground, a weeping spot with a white mossy bloom of spores is formed.

Advice: remove affected leaves, ventilate the room;
Treatment: slurry of lime and water, spraying with fungicides, copper-soap solution.

The appearance of powdery mildew is facilitated by a decrease in temperature (15-20⁰) together with an increase in humidity up to 80%. A white bloom is formed on the leaves, resembling flour with black inserts; when the disease starts, the leaves curl into a tube and fall off.

Tip: reduce the amount of watering;
Treatment: replace the topsoil, spray with a solution of fungicidal agents, which can be found in any garden and flower shop.

Black sooty fungus comes with insect pests, usually aphids and whiteflies. As the name suggests, dark spots appear on the leaves. The growth of marijuana slows down as the fungus clogs the holes through which the plant breathes.

Tip: wipe the leaves with a damp cloth to remove plaque;
Treatment: fungicidal agents are useless, you need to fight insects. Spraying with Bordeaux mixture or soapy water may help. In addition, aphids do not like the neighborhood with odorous geraniums.

Non-communicable diseases

Caused by external factors. These include a change in the habitat, a temperature drop, a sharp change in the diet of a plant, and a mineral imbalance.

Cannabis diseases can also occur due to improper water intake. Both overflow and underfill are dangerous. In the first case, mold may form on the surface of the earth and the subsequent rotting of the stem, in the second, the leaves will begin to dry out and turn yellow.
Tip: watering as needed, only when the topsoil is dry. During the period of low air humidity (in winter, during the heating season and in summer – less than 50%), humidify the air additionally.

There is no scientific evidence for the resistance of a particular cultivar. Too many factors influence susceptibility to disease, but indica cannabis is believed to be more susceptible to sunburn and cannabis sativa is more resistant to fungal diseases. But again, a lot depends on the conditions of the external environment and high-quality, unobtrusive care for the plant.

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