Thermography, which is a method for obtaining surface temperature, was used to diagnose street trees. Leaf temperature provides physiological information about processes such as stomatal movement, transpiration, CO2 uptake, and air pollutant absorption under steady-state thermal environments. Actually, the effect of environmental stress on zelkova trees on Aobadori St. in Sendai city was evaluated from the difference between temperatures of trees. Also, the recovery after pruning branches, and painting with mud and injecting nutrition to the trunk of a damaged tree was diagnosed from the spatial difference of leaf temperature. The use of both thermography and portable porometer makes a precise diagnosis of street trees possible.
