
Deadstill
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I attended a seminar at CannaCon 22 last weekend that covered HLV by Tassa Saldi of TUMI Genomics, called "Hop Latent Viroid Fact, Fiction and Management".
It IS a real thing. The only way to confirm it's presence is a PCR or LAMP test. According to them, 73% of all facilities in CO have HLVd. Among many other states.
Here are my notes I took during the seminar -
Let me know if anyone has any questions on my notes and I'll try my best to clarify.
It IS a real thing. The only way to confirm it's presence is a PCR or LAMP test. According to them, 73% of all facilities in CO have HLVd. Among many other states.
Here are my notes I took during the seminar -
Let me know if anyone has any questions on my notes and I'll try my best to clarify.
Hop Latent Viroid Fact, Fiction and Management
Hop Latent Viroid causes major economic loss
can start asymptomatically and spread quickly
There is no topical treatment
dramatically reduces flower weight, thc/cbd
first identified in 1987
like cross species jumped to cannabis
Colorado infected
73% of facilities have it
only hosts are hops, stinging nettle, and cannabis
intracellular parasites
disinfectant will not kill
symptoms likely due to plant immune system
mechanical transmission
sap introduced into wound of healthy plant
trim process is the most common infection time
touching plant sap also infects
water transmission can remain infectious for 7 weeks in water
seed transmission – hops is 8% no published studies on cannabis
insects can infect – not known how
SYMPTOMS
Christmas Tree Growth
Horizontal Growth - increase
Stunted Growth
Makes branches brittle
Overlapping leaves
Discoloration, yellow and stunted
Stunted trichomes reduced potency dramatic loss in yield
Worst thing is it is asymptomatic but contagious
ONLY way to be certain is to get a test
How to protect-
Proactive approach
Preventative pathogen program
Sterile Environment
Test Regularly
Organize
Protect Your Borders
(STOP)
1 Sterile environment – PPE for all indiv. Including foot baths – gloves – surfaces – promptly pick up dead plant matter
Bleach not alcohol – not effective on viroids
DO NOT compost infected material
2 Test Regularly – Mother stock every 6 weeks – test random clones – test sus. veg plants- routine water testing of tanks and lines at least every 6 months
3 Organize to limit pathogens - limit traffic in facility- track location of clones from mothers, do not mix clones from multiple strains in same tray- track and record data on pathogen testing, prevalence
4 Protect your borders- Do not let anything into facility that has not been tested for pathogens- request testing reports/data from clone providers – set up quarantine space for new material, test, wait 4 weeks, test again, then move to main room – test with other moms regularly
Can I afford this?-
Cost of testing is 1.50 per flowering plant (50-100 Mothers – 25-30 clones per plant) Prevention costs less than Reaction
How to test- Upper clone stem 61% success – New growth petiole 36% success – Old growth 75% success- Upper root and lower root 100% success (highest in upper root)
How to pick a testing lab -
Sensitivity
Specificity
Accuracy
Ask for a validation document
Ask what kind of test for HLVd and why
PCR or LAMP test – pcr more accurate- doesn't really matter
Most cannabis virus are likely uncharacterized
Hop Latent Viroid
Beet Curly top virus
Lettuce chlorosis virus
tobacco streak virus
TUMI Genomics
Tissue Culture is Effective at Cleaning Infection – takes 6 mo to 1 year
Hop and Cannabis genetics very similar
Seeds can be cleaned with 10% bleach