The study of pathogen infection in cannabis plants has long been overshadowed by the extensive research conducted on its cousin, hemp. While hemp has been cultivated for centuries and its diseases well-documented, cannabis, with its high levels of THC, has faced prohibition and a lack of research attention. However, as more states and countries legalize cannabis, there is a growing interest in understanding the pathogens that can affect its cultivation.
Recently, Dr. Zamir Punja and his team at Simon Fraser University conducted a three-year study on root diseases affecting hydroponically grown cannabis plants. By examining plants showing symptoms like stunted growth, root rot, and leaf discoloration, they were able to identify two genera of pathogens – Fusarium and Pythium. These pathogens were confirmed through PCR analysis to be species known to cause root rot and other plant diseases.
Pathogenicity tests further confirmed that these fungal species were indeed responsible for the observed root disease in cannabis plants. The study highlights the importance of continuous monitoring in hydroponic systems to prevent the spread of pathogens which can easily infect multiple plants.
Hydroponic systems offer advantages in terms of nutrient control and easy monitoring of plant health but also pose risks due to the potential spread of pathogens through recirculating solutions. Proper sterilization of tools and equipment is crucial to prevent contamination, especially in systems where cross-infection with other plant hosts is possible.
As countries expand their cannabis markets, growers should be vigilant in monitoring for pathogenic diseases and ensuring proper sterilization practices to protect their crops from these harmful pathogens.
