OCONUS DEFOLIATION TEST PROGRAM.
A test program was conducted in Thailand in 1964 and 1965 to determine the effectiveness of aerial applications of Purple, Orange, and other candidate chemical agents in defoliation of upland jungle vegetation representative of Southeast Asia on duplicate 10-acre plots. Aerial spray treatments were applied at rates of 0.5 to 3.0 gallons per acre on two test sites representing tropical dry evergreen forest and secondary forest and shrub vegetation. Applications were repeated in alternate 2- to 3-month periods to determine minimal effective rates and proper season of application. Defoliation effectiveness was evaluated by (1) visual estimates of overall vegetation and individual species defoliation, (2) measurements of changes in canopy obscuration by a vertical photography technique, and (3) measurements of changes in horizontal visibility of a human-sized target at various ranges. Data provided by these techniques were used in comparative evaluation of defoliant chemicals in relation to rate, volume, season of application, canopy penetration, and vegetation response. (Author).
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