Nanoemulsions are effective pesticide delivery systems because the process improves physicochemical stability of pesticides and reduces the use of organic solvents. Fungicidal and insecticidal activities are improved because nanoemulsion results in improved spreading, deposition, and permeation of active hydrophobic components to the target site, thus allowing for lower rates of application. For these reasons plus the added benefits of the low mammalian toxicity, nanoemulsion-based biopesticides are being formulated by the agrochemical industry and are highly sought by growers and consumers. Because terpenes are by nature volatile and ephemeral and extended shelf life is essential for biopesticide markets, correct formulation of terpene by-products of CBD/THC extraction is necessary if they are to be effective biopesticides. The terpenes and cannabinoids in industrial hemp by-products impact insect behavior and are active against both human and plant pathogens. Formulation of these by-products as nanoemulsions can increase grower revenue, reduce waste streams, and provide alternatives for use in cropping systems where synthetic pesticides use is restricted or prohibited.

Our research is based on the hypothesis that when formulated correctly, the industrial hemp residues remaining after cannabinoid extractions can be used to produce effective biopesticides. Our technology relies on terpene-rich industrial hemp by-products formulated into a shelf-stable nanoemulsion. The objectives of the research reported here were to test efficacy of these rich sources of bioactive natural products formulated as a nanoemulsion for 1) control of diseases and 2) control of insect pests.

Learning Objectives:

• Hemp processing by-products contain bioactive natural products that can be formulated as a natural biopesticide
• Nanoemulsions from hemp processing by-products can be used to control powdery mildew diseases
• Nanoemulsions from hemp processing by-products inhibit insect growth and development