Early Powdery Mildew Detection

Powdery Mildew can create a mycelium network on cannabis plants before it sporolates and can be visually detected. With DNA-based testing, cannabis cultivators can identify plants that are infected with powdery mildew before they show visual signs. From there, they can treat or remove the infected plants before the fungus has a chance to produce spores that will infect neighboring plants.


Applications Across Grow Operation

Screen Incoming Clones

A single infected clone can spread powdery mildew through an entire grow. Don’t rely on visual inspections. PM creates an invisible mycelium network before showing visual signs.

Check Mom Before Cutting New Clones

Screen mother plants before taking any cuttings and significantly reduce the likelihood that the dozens of clones derived from that mother contain powdery mildew.

Protect Grow Room with Periodic Screens

Periodic screenings of grow rooms or mother plants for powdery mildew can help identify infected plants before they produce the spores that cause the fungus to spready.

Available on Two Platforms

The youPCR® Plant Screening Platform tests plant DNA obtained from a small hole punch in the leaf. If the DNA sample contains the powdery mildew sequence, a chemical reaction will turn the pink solution yellow, indicating a positive result.

The PathoSEEK® Plant Pathogen Testing Platform tests plant DNA obtained from a small hole punch in the leaf. If the DNA sample contains the powdery mildew sequence, the qPCR instrument will detect a fluorophore signal and display results on a computer screen.

Available Powdery Mildew Detection Products

Item # Name Reactions
420115 PathoSEEK Powdery Mildew Detection Assay 200 Buy Now
420216 Powdery Mildew Positive Control 50 Buy Now
420211 youPCR® Solution B – Powdery Mildew 50 Buy Now

Getting Started with youPCR is as easy as 1, 2, 3.

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Frequently Asked Questions

Can I use youPCR to test seeds?

No. Although we have done some initial research into using youPCR to test seeds, we have not done enough to confidently say it works as well as testing leaf. We recommend sampling a seedling’s first set of true leaves when using youPCR.

Can I use youPCR to determine cannabinoid percentages?

youPCR assays provide a positive/negative result. When using youPCR to screen for CBDA or THCA synthase, a positive result means there is an active CBDA or THCA synthase allele. Unfortunately, that result can’t be used to predict what percentage the plant will ultimately produce. However, if you combine the CBDA and THCA tests you can determine the plant type.

  • Type I Plant (THCA-dominant) = THCA(+) CBDA(-)
  • Type II Plant (THCA:CBDA hybrid) = THCA(+) CBDA (+)
  • Type III Plant (CBDA-dominant) = THCA(-) CBDA(+)
  • Type IV Plant (CBGA-dominant) = THCA(-) CBDA(-)
Does a negative result on the youPCR THCA Synthase Assay mean my plant will produce less than .3% THC?

No. Plants that test negative for THCA or CBDA may still produce low percentages (<2%) of either compound.

Can I use the youPCR Gender Assay to detect hermaphrodites?

No. Cannabis plants typically hermie as a response to stress. Although there may be genetic markers that determine if a plant is more likely to hermie, we have not found them, and we do not target them with our gender test. The youPCR Gender Assay specifically looks for a Y chromosome.

Are all the necessary consumables and equipment included in the youPCR starter kits?

The youPCR Starter Kits do not include PCR Thermal Cyclers. We recommend the following models:

  • miniPCR. Use Promo Code “MGC” to receive a discount off list price.

The youPCR Starter Kits also do not include chemical reagents: Solution A, Solution B, Solution C, and Positive Control. Those must be purchased separately on the Medicinal Genomics web store.

What basic laboratory experience do I need to run youPCR tests?

In order to successfully test with youPCR, you should have experience with the following laboratory techniques/best practices:

  • Liquid handling with a pipette
  • Benchtop sterility techniques
  • Proper disposal of tips, punches, strip tubes
Are Medicinal Genomics products ISO certified?

All of the chemicals and reagents we sell in our webstore are manufactured in facilities that are certified to ISO 9001 and/or ISO 13485 standards.

Still have questions? Don’t hesitate to reach out to us.