Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: June 30, 1995
Publication Date: N/A
Technical Abstract: Abiotic stress factors induce disease symptomology that is difficult to diagnose on urban vegetation. Pesticide phytotoxicity, spray-drift, air pollution, road deicing salt, temperature and moisture extremes can all result in urban plant stress Abiotic disease symptoms usually result from interruptions in normal physiological plant processes. Diagnosis of gross symptomology can be subjective, confusing or indefinite because of mimicry by other biotic or abiotic factors. Electron beam analysis (EBA), a combination of scanning electron microscopy and energy dispersive x-ray analysis with digital image analysis has been used to diagnose abiotic disease by detecting unique changes to the plant cuticle. Recently developed cold field emission and variable pressure scanning electron microscopy, when used with EBA, may provide alternative methodologies for diagnosticians. Infrared analysis of CO2, H2O and vapor pressure deficit may provide accurate measurement of water stress.