Use of Aerial Photography to Detect Diseases in Peanut Fields II. Cylindrocladium Black Rot1

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Abstract
Aerial surveys were conducted over portions of the peanut (Arachis hypogaea L.) growing region of Virginia during September, 1974. The flights were conducted to determine the spectral, spatial, and temporal characteristics of Cylindrocladium black rot disease in peanut fields utilizing false color infrared and natural color imagery. The disease, caused by the soil-borne fungus Cylindrocladium crotalariae (Loos) Bell and Sobers, was detected on imagery obtained at 19,803 m above mean sea level. The disease was easily detectable on either false color infared or natural color imagery at 3,504 m above mean sea level. With its unique spectral/spatial signature, the disease was distinguishable from other diseases of peanuts such as Sclerotinia blight. Disease patterns that were difficult to observe from the ground were easily detected with aerial photography. Analysis of field soil samples for C. crotalariae microsclerotia confirmed results of imagery analysis. Detection of the disease by aerial surveys will permit prompt control measures to minimize spread of the disease. Information from this study will provide permanent records that can be used to monitor the change in extent and severity of the disease in future growing seasons.

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