Hemp Update #8

Tissue Culture for Propagation?

Greenhouse Pest Management – Good Resources:

Identification of insects and general control (pesticide information may not be valid for hemp):


Utilizing Insect screening:



Focus on Pythium:

Pythium root and stem rot is usually noted by wilting top growth because the roots can no longer support the plant.  But other symptoms can occur earlier such as plants that are stunted, low in vigor, or slow growing and wilting on warm days. 

Pythium root and stem rot occurs when the disease is present and is favored by cool, wet soil conditions.   Even, skillful watering, if watering by hand in a greenhouse, is essential to plant success.

The result is the appearance of brown to black, soft, rotted roots.   One common symptom is that the outer portion of the root  easily slides off of the inner part of the root leaving a white center that is thin and hair-like in appearance.  Often this happens when removing the plant from the soil.  In some plants, the disease moves up the crown and stem blackening above soil-level too.

Over fertilization can burn roots with excess salts, leaving wounds for diseases to enter.  Managing fertility is key to managing Pythium infection rates. 

But the greatest key in controlling Pythium is sanitation. 

·         Utilizing sterile potting mix only

·         Using only new or properly sanitized pots/flats

·         Regularly sanitize potting areas and any tools used in propagation

·         Keep flying insect infestations to a minimum because they can transport spores on their bodies

·         Managing cross-contamination from soil tracked in from outside.  Pythium is everywhere in the environment outside and all it needs is the right environment to create significant losses to seedlings and cuttings. 

·         Keeping watering wands off the floor.  They can pick up contaminated soil from the floor and then spray it on the plants.

·         Sanitizing the greenhouse between crops https://ag.umass.edu/greenhouse-floriculture/fact-sheets/cleaning-disinfecting-greenhouse

Or https://www.extension.purdue.edu/extmedia/HO/HO-250-W.pdf

Pythium on Cuttings:


What is the “Entourage Effect”?

The entourage effect is a term that is used to describe the potential interaction between THC, CBDs, terpenes (i.e. all of the plant chemistry) that may have medicinal benefits in Cannabis.  It refers to a synergistic potential in that plant extracts are suggested to be “greater than the sum of the parts”.  There is mixed scientific data on each side of the possibility that this exists and whether single component medicines are more or less effective than those with mixed chemistries.  However, hemp/CBD producers should be aware of the discussions and terminology, even if they are not scientifically proven, customers are applying the principals.  This is the difference between a customer asking for a full-spectrum product, because it contains the wide array of  components versus something produced with isolate, only containing CBD.  Surely, as science and medicine move forward on analyzing these components and their effects on health, certain varieties and or growing practices will be noted for their ability to favor/discourage specific compounds.  Like milk, I can imagine a component pricing schedule in the future that is more complicated than the current (paid by %CBD only).    Therefore, when testing your hemp, as you might do for THC levels through the growing season, consider testing for all of the components, that can currently be analyzed, and keep records of your results for future decision-making in comparing varieties, production practices, or even soil types.

About Testing…

These labs provide analysis for THC, other contaminants, and measure the preferred chemicals as well.  Each lab is a bit different in what is offered so be sure to obtain a sample result (COA-Certificate of Analysis) and compare them to obtain the analysis you are looking for.

·         East Coast Labs 172 Taunton Avenue East Providence, Rhode Island 02914 https://www.ecltesting.com  Contact: matthew@ecltesting.com (401) 400-2709

·         ProVerde 420 Fortune Blvd. Milford, MA 01757 http://www.proverdelabs.com  Contact: Chris Hudalla (617) 221-3356

·         MCR Labs, LLC 85 Speen St. Framingham, MA 01701 https://mcrlabs.com  Contact: Michael Kahn (508) 872-6666

·         CDX Analytics 39 Norman St. Salem, MA 01907 https://cdxanalytics.com  Contact: Brian Strasnick (978) 619-2244

·         Eurofins BioDiagnostics, various locations,  https://www.eurofinsus.com/biodiagnostics/our-services/hemp-testing/  e-mail: EBDIHemp@eurofins.com

Also, if you have obtained your own equipment to test for THC (there are several suitcase-sized machines out these days), be sure to calibrate your results along with 2 or 3 of the above labs to be sure you are in the same range before you rely on your test completely.

NY Hemp Exchange

Remember to post to the buy/sell board or go looking for a match to your need.

Post an ad: https://cornell.qualtrics.com/jfe/form/SV_e35Eb3pNfpWkqhv

View ads: https://s3.amazonaws.com/assets.cce.cornell.edu/attachments/37547/hempadupdate4-24.pdf?1556201539

Cornell Cooperative Extension does not endorse or recommend any product, service, individual, business or other entity.