the value of large-scale 70 mm aerial colour photography as 
a research tool for dieback studies. Because of the 
ability to detect and plot the deaths of individual under 
storey specimens, it is ideally suited to studies of die- 
back rate of spread over a wide range of sites and for the 
observation of sites which cannot at present be positively 
identified as Fhytophthora -infected. Repeated flights 
over the same lines over a number of years is feasible 
though stricter navigational control would be necessary. 
ACKNOWLEDGEMENTS 
Acknowledgement is due to the Central Photogra 
phic Establishment of the Royal Australian Air Force for 
the loan of the camera. 
REFERENCES 
Batini, F.E. 
1973: Jarrah Dieback - A disease of the jarrah 
forest of Western Australia. W.A. For. Dep. 
Bull. 84, 45 P 
Batini, F.E., 
1972: 
Hopkins, E.R. 
Phytophthora cinnamomi Rands - A root pathogen 
of the jarrah forest. Aust. For. 36(1) p57-68 
Forests Department. 
1974: Annual Report of the Forests Department of 
Western Australia. 1973-74 (in press) . 
Packham, D.R., Peet, G.B. 
19^7: Developments in control burning from aircraft. 
Chem. Res. Lab., OSIRO, Melb. I8p. 
Podger, F.D. 
1972: Phytophthora cinnamomi . a cause of lethal 
disease in indigenous plant communities in 
Western Australia . Phytopath. 62(9) 
Podger, F.D., Doepel, R.F. Zentmyer, G.A. 
1965: Association of Phytophthora cinnamomi with a 
disease of Eucalyptus marginata forest in 
Western Australia. Plant Dis. Rep. 49(11 ) 
P 943-947.