Literature cited 
ARNETT, J.D.jr. (1976) Use of aerial photography in soybean 
cyst nematode surveys. Plant Disease Reptr. 
60.(1), 3— 4 
BEHRINGER, P. (1976) Verbreitung des Rübenzystennematoden 
und seine Erfassung. Zucker, Nov., 18 - 24 
BRANSCHEID, W. (1978) Untersuchungen an der Hufrolle bei 
Pferden mit und ohne Hufrollenerkrankungen 
(Podotrochlose). Ph.D.Thesis Univ. Hohenheim 
(in press) 
BRENCHLEY, G.H., and DADD, C.V. (1962) Potato blight record- 
ing by aerial photography. N.A.A.S. Quart. 
Rev., London, 57, 21 -.25 
-,7 (1966) The aerial photography of potato blight 
epidemics. J. of the Royal Aeronautical Soc. 
70, 1082 - 1086 
DECKER, H. (1969) Phytonematologie. VEB Deutscher Landwirt- 
schaftsverlag, Berlin, 432 pp. 
FENWICK, D.W. (1940) Methods for the recovery and counting of 
cysts of Heterodera schachtii from soil. 
J. Helminthol. 18 (4), 155 - 172 
GAUSMAN, H.W. (1971) Photographic remote sensing of "sick" 
Citrus trees. Proc. Int. Workshop on Earth 
Resources Survey Systems, Ann Arbor, Mich., 
Vol. 2, 15 - 30 
— , GERBERMANN, A.H., WIEGAND, C.L. (1975) Use of 
ERTS-1 data to detect chlorotic grain sorghum. 
Photogramm. Engn. and Remote Sensing 40, 
177 - 181 
HEALD, C.M., THAMES, W.H., and WIEGAND, C.L. (1972) 
Detection of Rotylenchulus reniformis infe- 
stations by aerial infrared photography. 
J. Nematol. 4 (4), 298 - 300 
HILDEBRANDT, G. (1976) Die spektralen Reflexionseigenschaften 
der IE vi Rem. Sens. in Forestry, Proc. 
Symp. World Congr., Oslo, 1l - 14 
KÜSTERS, J. (1976) private communication 
LANGE, G. (1978) Feature and applicability of PODIUM (Polygon 
Oriented Digital Image Utilization Management 
System). see publication in these proceedings