Hermetic bags from the Purdue Integrated Cowpea Study (PICS) are found to save crops in unexpected ways, as they are useful in preventing the growth and feeding habits of weevils in cowpea storage, particularly through depleting the levels of oxygen in the bags. The program is expected to be adopted by 3.4 million households in West and Central Africa, which will save half a billion dollars a year in saved grain overall.
http://www.purdue.edu/newsroom/research/2012/120221MurdockPICS.html
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