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Post-harvest Innovation for Crop Storage

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Post-harvest Innovation for Crop Storage

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PICS Program


PICS research has improved the standard of living for millions of people in the developing world. We continue this legacy in hopes of improving the quality of life across the world.

Basic Research

Insect Biology

Understanding the biology of insects in hermetic environments is crucial to being able to control them. We investigate several different aspects of stored pest biology including internal acoustic signals of insects in hermetic storage, the effect of hypoxic environments on insect reproduction and feeding activity, and the dynamic utilization of oxygen by insects in hypoxic environments.

Seed Physiology

The environments in which seeds are stored have the potential to affect the quality and quantitative physiological aspects of those seeds. We research the effects of differing moisture content on the viability of stored seeds and how their storage environment affects attributes such as germination rate, seedling vigor and nutrient content.

Acoustic Detection

Our lab uses acoustic detection to monitor insect behavior during hermetic storage and controlled atmosphere treatments. The acoustic work augments research with the biomonitor tool in our lab which also offers real-time monitoring of feeding behavior of insects. Acoustic detection helps monitor insect activity without breaching atmospheric seals during storage.

Applied Research

Applied Field Research

We actively collaborate with researchers across the globe and other Purdue faculty on projects that directly impact smallholder farmers. Interviews and questionnaires completed by local populations help to gauge the economy of hermetic storage application and usage, while interacting directly with smallholder farmers and their hermetically stored grain allows for techniques created in the lab to be tested in the field.

Storage Technology Utilization

Although the PICS project’s original impetus was for the storage of cowpeas, the usage of this technology has expanded to include a variety of grains and stored products. New products are continually tested for their efficacious storage in PICS bags, and the results of these trials allow smallholder farmers to extract more value from their hermetic storage purchase.

Pest Surveys in Developing Countries

Knowledge of what insect pests affect which countries can help to guide research and extension efforts in areas where hermetic technologies are used. We work with researchers to conduct surveys to identify pest insects of stored grain in Africa and Asia so that a more complete picture of the distribution of these pests can be elucidated. In addition, these pest surveys can highlight areas where insects have the potential to expand to, allowing local extension agents to help local farmers prepare for these invasions.

Interdisciplinary Research

Storage Mold and PICS Bags

Insects are not the only organisms to negatively impact postharvest management strategies. Mold and other fungi can also infiltrate stored products. Aflatoxins, some of the most carcinogenic substances known, are produced by the fungi Aspergillus flavus and A. parasiticus in grains and other foods that are improperly stored. Through collaborations with Purdue faculty and researchers at other institutions, we are actively researching the effects of hermetic environments on aflatoxin production and retention in stored products.

PICS Bags and Developing Markets

PICS bags are in use in more than 25 countries throughout Africa and Asia, and assessing the market impact of this technology is an important aspect of our research. We collaborate with faculty and extension agents both here at Purdue and from academic institutions abroad to evaluate public utilization of PICS technology and how to position PICS bags for higher market shares.


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Villages reached
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farmers trained

Training of Trainers

In order to effectively train farmers and others in the proper use of PICS bags, and hermetic storage techniques in general, training sessions are held so that the proper techniques can be shown to those who will either be using the bags or training others to use the bags. It is essential to train effective farmers group leaders, extension agents and others in the proper use of hermetic storage technologies if the techniques are to be adopted.

Often, these training of trainers are combined with other activities, such as Open the Bag ceremonies. These events directly highlight the effectiveness of hermetic storage technologies using the farmers own grains or other stored products. At a time before either the Training of Trainers or Open the Bag ceremonies, a group of farmers were selected to be asked to voluntarily supply portions of their harvest to be stored in PICS bags. Later, during the Open the Bag ceremonies, the farmers are asked to open and inspect their grain for damage. These inspections often occurred six months or more after the initial storage time with the farmers seeing that their grain is undamaged and effectively stored in a hermetic storage device without using chemicals.

Local Engagement

PICS participates in local annual events including Purdue Spring fest and the Indiana State Fair. Youth are encouraged to compete in a PICS bag tying contest, with prizes awarded to the individual with the fastest tying skills.


Dieudonné Baributsa
(765) 494-8713

Dieudonné Baributsa

Dieudonné Baributsa is an Associate Professor of Entomology at Purdue University. He has more than 20 years of experience in international development. He currently leads the Purdue Improved Crop Storage (PICS – Program aimed at reducing grain postharvest storage losses to improve food security and income of smallholder farmers around the world. Dieudonné focuses on applied research and innovative extension approaches to scale-up postharvest solutions in developing countries. His broad areas of interest include agricultural technology development/dissemination; supply chain and commercialization of agricultural technologies; and ICT innovations for technology scale-up.

Bradley Smith
(765) 494-1439

Bradley Smith

As laboratory manager, I help to coordinate research activities, colony maintenance and equipment usage for the Baributsa lab here at Purdue. I also assist the graduate students with their research and undertake my own studies, such as analyzing the volatiles that escape from products stored in PICS bags. Before joining the PICS lab my research touched on a broad range of topics, from biodiversity estimation and population distribution modeling to biological control research and insecticide discovery.

Anastasia Njoroge

Anastasia Njoroge

My research interests include post-harvest entomology, hermetic storage and acoustic detection of insect pests and their impact on improving livelihoods and food security.  I have actively been involved in PICS activities in Africa as part of the team conducting training of trainer workshops for extension agents in Kenya, Uganda, Malawi, Tanzania, Zambia and Ethiopia. My current research at Purdue University is focused on the acoustic detection of insect pests in hermetic storage and controlled atmosphere (CO2 and N2) systems. I test the effectiveness of different storage technologies in the control of post-harvest insect pests.  I also conduct and coordinate field research in Kenya, Nepal, Haiti and Peru using Kobo Toolbox, an online data collection platform. I train on how to use Kobo Toolbox. I also teach undergraduate students and help supervise graduate students.

Jorge Díaz-Valderrama
(765) 494-0363

Jorge Díaz-Valderrama

I am a postdoctoral researcher at the Baributsa lab. My research goals are to understand the postharvest management practices from Peruvian grain farmers and to identify the causes for the 15–30% postharvest losses they experience. I am actively involved in the “Capacity Strengthening for Postharvest Handling and Storage in Peru (CAST-PHS)” project from the Arequipa Nexus Institute, which aims to train farmers, extension agents and researchers from Arequipa, Peru on sustainable strategies and technologies to address postharvest/storage issues. My work also puts emphasis on building the capacity of local students on conducting research for proper postharvest management of pests and mycotoxins on local grain crops, such as quinoa, rice, and the nationally acclaimed “Camanejo” bean and “Cabanita” maize. My work is laying the basis for future postharvest interventions in Peru.

Past Members

NameYearWhere are they now?
Kabita Kharel, PhD Student2018Murray State University, Adjunct Professor
Hannah Quellhorst, MSc Student2018Kansas State University, PhD Student
Sarah Dietrich, Lab Technician2017Michigan State University, MSc Student
Scott B Williams, Post-Doctoral Researcher2016Spensa Technologies Inc, Research Scientist-Entomologist
Yan Yan, Visiting Scholar2015Vanderbilt University, PhD Student