Abstract
Automatic diagnosis of plant disease that will become a important technique for plant management in the future was suggested and was got some results in the past study. Until now, 650nm is important for diagnosis of plant disease, and P0 and Th_M0 which are distinction parameter between healthy and diseased leaf was invented using its wavelength information. This article reports on new results in next; 1) Distinction parameter which was made until now has good distinction rate in outdoor. 2) Several parameters were combined by genetic programming (GP) which was installed, and it makes new parameter that have better distinction rate.
