Â鶹´«Ã½

Stressed plants can no longer hide their pain. Chlorophyll usually disguises
the signs of stress in diseased or weak plants. But NASA researchers have
developed a filter that blocks out most of the yellow and green light in
reflected sunlight to render the chlorophyll invisible. Farmers wearing goggles
fitted with the brownish plastic lenses will be able to spot suffering plants
before they are beyond help.