Botrytis, also known as gray mold or bud rot, is the most common disease caused by humidity. It affects various crops such as tomatoes, cucumbers, peppers, basil and roses, as well as cannabis.

Preventing Botrytis

Botrytis is a fungal disease that thrives in high levels of humidity. The best method to combat botrytis is by preventing its appearance. Fungal diseases such as botrytis can be effectively prevented by avoiding the climate conditions necessary for their formation. This can be achieved by maintaining a lower relative humidity level and avoiding condensation.

Cannabis is Highly Sensitive to Humidity

Cannabis flowers are extremely dense, trapping humid air inside. This creates the perfect conditions for botrytis to break out.

Cannabis evaporates large quantities of water, causing the humidity inside the greenhouse, or indoor growing space to rise rapidly. These conditions inevitably cause botrytis to appear, creating spores which are then dispersed through the air, infecting additional plants.

Botrytis poses a threat at all stages of cannabis production, including post-harvest processes such as drying and curing.

Infected cannabis buds may not be used or distributed.

Preventing Botrytis in Cannabis

Fungicides are currently the primary method to combat botrytis. This is a more toxic solution and is limited due to health concerns and regulations.

The better option is to prevent botrytis outbreaks, rather than combatting the fungal disease once it appears.

The traditional greenhouse solution is to reduce humidity by ventilating. This method poses several problems. As ventilation involves introducing air from outdoors, it is often times inefficient, causing climate fluctuations in the growing space and leading to excessive heating or cooling, which is necessarily applied in an effort to maintain comfortable conditions.

The best method to eliminate botrytis in cannabis cultivation is to treat the factors that instigate its spread, from inside the space.

Taking into consideration both the grower’s and plants’ needs, DryGair designed an efficient solution to dehumidify the greenhouse air, reducing the humid air trapped inside the flowers and stopping fungal development.

DryGair is a proven, efficient and non-intrusive solution to humidity related diseases.