Growers around Californa are facing a virus problem, and one of California’s oldest cannabis nurseries, Dark Heart Nursery (DHN), has the antidote. With the help of Dr. Jeremy Warren, DHN discovered the HpLVd virus that has been plaguing growers for the past several years. Now, it’s time to clean up.
Cause of Cannabis “Dudding” Identified: HpLVd Virus
Throughout history, the cannabis plant has faced its fair share of viral infections. Repeated infections gave rise to genetic changes over time, altering the evolution of the plant. In fact, there is evidence that ancient viruses are at least in part responsible for the herb’s ability to produce THC.
For the past several years, however, viruses have taken a more sinister role in the plant’s life. Strains that once grew vigorously have started to show signs of ware — a drab yellow color replacing what should be a vibrant green. Misshapen leaves develop without warning, under conditions that would otherwise result in a thriving harvest. Growers developed their own term to describe the phenomenon, “dudding”.
These unusual symptoms were recorded in 2015, when Dr. Rick Crum found that as much as 35 percent of nursery samples demonstrated these symptoms, along with stunted growth. At the time, the cause of these symptoms was identified as “punitive cannabis infective agent” (PCIA), a term used to describe the unexplainable loss of vitality among cannabis plants.
Now, however, a team at DHN has finally identified a cause: the hop latent viroid. Also known as the HpLVd virus, DHN is the first organization to identify the precise cause of dudding.
From Clone to Clone
As reported by Cannabis Now, a group of underground researchers in California called Humboldt DNA articulated that PCIA appears to be passed along via pollen exposure and cloning of infected plants. This allows the virus to be transmitted quickly, infecting larger numbers of plants each year.
As you might guess from the name, hop latent viroid is a virus that traditionally attacks hop plants. Hops, which are used to make beer, are among the closest relatives to the cannabis plant. Throughout the mid-2000s, reports suggest that the HpLVd virus is spreading. In 2007, hop farmers in China filed the first statements suggesting that the virus was harming local harvests. The same virus causes similar symptoms in hops, and cannabis appears to be a prime new target.
The rapid spread of the virus was confirmed researchers at Dark Heart Nursery, who found that healthy plants exposed to infected clones were quick to “dud” themselves. The team that made the discovery was led by Jeremy Warren, Ph.D., who now works as DHN’s Director of Plant Health.
Clean Up Time
This same virus is now attacking cannabis plants, potentially causing major losses for medical and recreational cannabis growers alike. While the virus has been identified in cannabis, clear plans for eradication still illude many growers. Should the virus infect a large portion of a harvest, growers may be forced to dispose of their crops and decontaminate their soils and growing mediums.
Among identifying HpLVd, Dark Horse Nursery has developed a functioning “clean process” under the guidance of Research Manager Will Roberts. This process, however, is currently patent-pending, giving DHN ownership over the eradication processes. Apart from mimicking eradication processes used by the hop industry, however, many home growers and professional cultivators alike may still be left in the dark regarding how to properly eradicate HpLVd illness in their plants.