Laser Holography: Its Application to the Study of the Behavior of Insecticide Particles1,2

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Laser holography was used to study the characteristics and behavior of insecticide aerosols. It allowed direct 3-dimensional stop-action study of spray particles as they impinged onto the larva of the western spruce bud worm, Christoneura occidentalis Freeman, and its silk webbing. The setae of this insect were effective impingement structures for particles ranging from submicron to20µ. diameter. Spray droplets coalesced on the tip and migrated to the base, both with and against the spray current and against gravity. Among 5 solvents studied there was significant evaporation of relatively nonvolatile solvents, particularly when the droplets were below about 40µ diameter.

Document Type: Research Article

Publication date: April 1, 1971

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