Abstract
Permethrin was applied by airplane to cotton in Three formulalions: 0.112.kg of insecticide in 9.35 liters of water per ha (conventional EC-water); the same amount of Insecticide in 2.34 liters of vegetable oil per ha (ULV-oil); and a like amount of insecticide in 2.34 liters of water per ha (ULV-water). Nine applications were made over a period of 2 months. Leaves from the upper and lower halves of the plants were collected 4, 24, 72, and 120 h after the first and last applications and extracted for surface and interior Permethrin. No statistically significant differences in trends with respect to formulation were found for leaf surface insecticide coverage and persistence or for canopy penetration. For the five days after the first set of applications, Permethrin applied in the water formulations penetrated the leaves more quickly than did that in the oil formulation; at the end of the study, however, insecticide levels in leaf interiors were not statistically different among the three formulations.
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