This image shows a group of professional scouts surveying a citrus grove for greening. The disease is usually easier to spot from an elevated platform such as that shown here because of the way in which the yellow branches appear in the trees. © 2010 Holly Chamberlain.

• Aperture:ƒ/4.5• Credit:Holly Chamberlain• Camera:D-LUX2• Taken:July 16, 2010• Focal length:19.2mm• ISO:80• Shutter speed:1/400s