COLOR PHOTOS, AERIAL SPRAYS AND THE FOREST TENT CATERPILLAR

COLOR AND FALSE COLOR AERIAL PHOTOGRAPHS, TAKEN AT SCALES OF 1:6,000 AND 1:15,000, WERE USED TO MEASURE THE AMOUNT OF FOLIAGE SAVED BY THE AERIAL APPLICATION OF EXPERIMENTAL CHEMICALS TO SUPPRESS INFESTATIONS OF THE FOREST TENT CATERPILLAR, MALACOSOMA DISSTRIA HBN., A HARDWOOD DEFOLIATOR, IN SOUTHWESTERN ALABAMA. PLOTS PROTECTED BY AERIAL SPRAYS WERE READILY DISCERNED ON BOTH FILMS BUT EKTACHROME INFRARED AERO FILM PROVIDED GREATER CONTRAST BETWEEN SUSEPTIBLE AND UNSUSCEPTIBLE HOST TYPE AND GREATER CONTRAST BETWEEN CLASSES OF DEFOLIATION. THE 1:15,000 PHOTO SCALE WAS SOMEWHAT SUPERIOR BECAUSE IT PERMITTED INTERPRETATION OF A LARGER LAND AREA WITH A MINIMAL LOSS OF DETAIL. THIS PERMITTED MEASUREMENT OF THE IMPACT OF SPRAY DRIFT UPON ADJACENT PLOTS. MICRODENSITOMETER SCANS OF THREE ADJACENT PLOTS ON FALSE COLOR FILM RECEIVING SIMILAR DEGREES OF DAMAGE REVEALED SIGNIFICANT DIFFERENCES ON OPTICAL DENSITY OF THE CYAN LAYER; HOWEVER, THESE DIFFERENCES COULD NOT BE DIRECTLY ATTRIBUTED TO THE AMOUNT OF FOLIAGE SAVED. /AUTHOR/

  • Supplemental Notes:
    • Vol 37, No 8 PP 867-873, 3 FIG, 1 PHOT, 6 REF
  • Authors:
    • Ciesla, W M
    • Drake, L E
    • Wilmore, D H
  • Publication Date: 1971-8

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Filing Info

  • Accession Number: 00202941
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 10 1971 12:00AM