Armyworm defoliation in corn as seen on ir aerial photographs
1976
CHIANG, H.C. | MEYER, M.P. | JENSEN, M.S.
A corn field partially under attack by armyworms was photographed in 1973 with 70 mm Aerochrome Infrared Type 2443 film and a Wratten 12 filter at scales of 1/15,840 and 1/6,336 during the early silking stage. In 1974, in the absence of armyworm defoliation, the field was again overflown at the same plant stage, and with the same camera/film/filter configuration used in 1973. Defoliation was not detectable on otherwise healthy corn plants (i.e., no drought stress); but defoliation was detected on plants already under stress due to drought.
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