New Technology Explores Using Light Instead of Chemicals To Control Pests

Posted by on March 18, 2015 in Sci-Tech, Technology with 0 Comments

By Russell McLendon | Mnn.com

Pesticides have helped improve food production and fight off insect-borne diseases, but they also have a well-documented dark side. Various pesticides have been linked to birth defects, cancer and other health problems in humans, as well as declines in wildlife ranging from bees to bald eagles.
The modern success of organic and biodynamic farming has helped remind us what we can do without synthetic pesticides, but insects still cause major problems worldwide — especially mosquitoes. And now a boom in lighting technology is beginning to hint at unexpected alternatives to chemical pesticides: lasers and light-emitting diodes, or LEDs.
The basic idea of using light to fight insects isn't new. Bug zappers, for instance, have long taken advantage of flying insects' attraction to light. Yellow and green fluorescent lights are also commonly used to reduce insect activity. A reflective mulching sheet has even been found to repel aphids and whiteflies when placed between rows of crops.
But the rapid growth of lighting technology is now raising hopes for more ambitious strategies, some of which might eventually help reduce the need for synthetic pesticides.
Guiding lights
Scientists have known for more than a century that ultraviolet (UV) light can kill microbes, making it useful for purifying water, food and even air. But thanks to the advancement of LEDs and lasers in the past two decades, we can now make light do things that would have seemed impossible a century ago.
Unlike the wires and gases of incandescent and fluorescent bulbs, solid-state lighting offers intricate control over wavelength, color and tone. The boom in LED technology has been largely motivated by energy efficiency, but the environmental perks of LEDs are increasingly rivaled by other benefits like light therapy or pest control. That's due to technological growth as well as recent biological research on light, says Fred Maxik, co-founder and chief technology officer of Florida-based Lighting Science Group. (Full disclosure: Lighting Science Group is associated with Pegasus Capital Advisors, an MNN sponsor.)
“It took a convergence of scientific discovery about what light can do and the technological efficiency to be able to actually do it,” Maxik says. “We can get a great deal of really interesting, fine controls now, where we can manipulate the wavelengths of light. And light is really the only energy by which life on this planet has been created and exists. So the fact that it can have all these other influences and powers in biology that we're just discovering is something that's really fascinating.”

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