Abstract
An emulsifiable concentrate formulation of methyl parathion (4 Ib/gal) was applied ultra low volume (ULV) and low volume (LV) with a Piper PA-18-A airplane. Insecticidal deposits were sampled in the swath and downwind of the swath at various intervals down to ½ mile with Whatman no. I filter paper sheets and with oil-sensitive cards. Aerial drift was studied in air samples taken at several locations downwind of the swath with cascade impactors. The ULV methyl parathion spread over a wider swath and was deposited on the ground sample sheets in higher concentrations downwind of the swath than the LV applications. A greater portion of the airborne material from ULV aerial sprays than from the LV sprays remained at the 5-ft height sampled downwind by the cascade impactors.
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