Using the tap method for psyllid sampling. This is a good way to estimate the numbers of adult Asian citrus psyllids in a citrus grove. You can find more info on this technique from University of Florida IFAS Extension.

• Aperture:ƒ/2.4• Camera:iPhone 5• Taken:March 10, 2013• Focal length:4.13mm• ISO:50• Location:27° 56.11′ 0″ N 81° 52.39′ 0″ W• Shutter speed:1/1900s