Hop-latent viroid, or HLVd, shrivels pot plants and reduce how much weight they produce by as much as 30%. It also destroys the amount of THC, pot’s most common active compound, that a plant produces, greatly reducing the value of affected plants.
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It’s now infected at least 90% of California’s cannabis grows, according to a 2021 estimate. It’s spreading globally
FWIW, a Reddit discussion