Molepse BioResources | Organic biopesticides for stored grain

Raised maize granary in the Kenyan highlands

Kenyan agricultural biotechnology

Protect the harvest after the harvest

Molepse BioResources develops organic, plant-based biopesticides that keep weevils out of stored maize, beans and other staple grains — without harmful synthetic treatments.

View products Talk to our team

Botanical biopesticide oil with maize kernels and herbs

Oil and powder formulations

Local plants. Proven grain protection.

Our formula is extracted from indigenous insecticidal plants and formulated as oil or powder that repels and kills weevils in stored grain.

See how it works

Botanical extraction research in the laboratory

From Mount Kenya University research

Science in service of smallholder farmers

Founded by industrial chemist Donatus Njoroge, Molepse turns indigenous botanical knowledge into affordable post-harvest protection for East Africa.

Our story

40%+ typical weevil-related grain loss in sub-Saharan Africa

6 months protection through to the next planting season

KSh 1M East Africa Post-Harvest Technologies prize

~US$0.60 accessible price point for smallholder farmers

What we do

Organic protection for stored grain

Plant-based formula

Essential oils and milled leaves from locally growing insecticidal plants, blended for weevil control.

Kills and repels

Dual action against larvae and live weevils, so infestation is stopped rather than merely delayed.

Made for storage

Applied directly to dried maize, beans and other stored grains in bags, cribs and granaries.

Priced for farmers

Designed for resource-constrained smallholders, at a lower cost than many synthetic alternatives.

Botanical research at Molepse BioResources

Why Molepse

A Kenyan answer to post-harvest loss

Weevils can destroy a family’s maize before the next season arrives. Molepse was built to stop that loss with a solution that is organic, effective and affordable.

Non-toxic botanicals

Formulated from local plants rather than harsh synthetic chemicals.

Season-long storage

Field tests with maize and beans farmers in Murang’a showed six months of protection.

Regionally recognised

Winner of the inaugural East Africa Post-Harvest Technologies Competition.

From indigenous plants to a farmer-ready product

Donatus Njoroge, an industrial chemist working at Mount Kenya University, developed Molepse after watching weevils devastate stored maize in central Kenya. He extracted essential oils from locally growing weeds, analysed their insecticidal compounds, and blended them into oil and powder formulations.

Organic in nature and intended to be safe around people and grain
Effective against major stored-grain insect pests
Available in liquid oil and powder forms for different storage systems

Read our story

Products

Protection scaled for every store

Smallholder

Recognition

Trusted science, regional impact

“Donatus Njoroge… has developed Molepse bio-resource oil/powder that has been proven to have the ability to protect all types of grains from weevil attacks.”

Daily Nation — Seeds of Gold

“I was looking for a solution that is organic in nature, that won’t affect human beings and at the same time a solution that will be effective.”

Donatus Njoroge, Founder & CEO

“Using the pesticide, the farmers were able to store maize for six months, which is enough period to store grains until the next season.”

Field tests, Murang’a County

“I witnessed first-hand food insecurity through destruction of maize by major post-harvest pests — weevils, as my parents were grain farmers in central Kenya.”

Donatus Njoroge, CHEManager

Insights

Post-harvest knowledge for farmers

Guidance

How to store maize so weevils never get a foothold

Molepse Team

Storage

Science

Why botanical oils can replace synthetic grain treatments

Research

Biopesticides

Food security

The hidden cost of weevils on East African food security

Impact

Policy

Stay informed on grain protection

Practical storage advice and product updates for farmers, cooperatives and agro-dealers across Kenya and East Africa.