Cannabis powdery mildew and odor control

Greenhouse resolves potential problems with powdery mildew, odor and blocked drippers

The CDEB-2.5 chlorine dioxide generator produces both ClO2 solution and gas

Commercial production of medical cannabis (marijuana) is allowed in many countries and some US States. The plants are often grown in large greenhouses, requiring treatment systems for water and air.

Three risks are managed:

Air can contain powdery mildew spores which damages final product for the growing operation

Chlorine dioxide destroys powdery mildew spores. This produces a quantifiable $$ saving for the operation, to justify its use. Chlorine dioxide gas is extracted from the CDEB generator and dosed into ducts feeding air to various locations in the greenhouses. Through a proprietary method, the concentration of ClO2 is maintained within the optimal band between underdosing (no effect) and overdosing (phytotoxicity – damage to plants).

Result: Cannabis powdery mildew control.

Air exhausted from the greenhouse contains odors which require treatment

Greenhouses can be located near residential developments and odorous air may cause complaints. Chlorine dioxide oxidises organic isoprene odors at low concentration. Odor control is a side-benefit of powdery mildew control.

Result: Odor reduction to acceptable standards.

Irrigation water can grow biofilm and block drippers

Chlorine dioxide is excellent for biofilm control at low residual. Chlorine dioxide solution at 2,000 ppm (2 g/L) is produced in the generator and stored in a small batch tank. This solution is dosed by metering pumps into the water reticulation pipework. Control is by automatic flow pacing.

Result: Excellent biofilm control.

Other options they considered:

  • Manual preparation of ClO2. There are methods for preparation of ClO2 where two precursor chemicals are mixed in a tank by hand. This is dangerous as operators are exposed to ClO2 gas at the preparation tank. ClO2 gas is not directly available with this method


The ElectricideĀ® CDE generators are available for purchase or rental, direct or through our distributors.

In most cases, you can install and commission the generator with remote assistance (web or phone). Dioxide Pacific can install and commission the system if desired. Installation is a simple process for mechanical and electrical technicians.

Download the case study sheet for this applicationĀ  pdf-icon-aa-30x30

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Contact us for more information or a quotation.