Evaluation of large scale aerial photography for identifying areas ofArmillariaroot rot in mixed species eucalypt forest

Summary Colour aerial photography at scales of 1:3000 and 1:6000 was used to identify 86.6% and 68% respectively of the 5.03 ha affected by Armillaria root rot in a 32 ha mixed species eucalypt stand, located in central Victoria. At the 1:3000 scale more of the infected area was detected and correctly mapped but a larger proportion of the healthy area was incorrectly classified as infected.