SEDL / STP / STP980-EB / STP26462S

Spray Volume Effects on Deposition and Citrus Rust Mite Control

Salyani, M
Assistant Professor of Agricultural EngineeringProfessor of EntomologyAgricultural Engineer, University of FloridaUSDA/ARSCitrus Research and Education Center, Lake Alfred, FL

McCoy, CW
Assistant Professor of Agricultural EngineeringProfessor of EntomologyAgricultural Engineer, University of FloridaUSDA/ARSCitrus Research and Education Center, Lake Alfred, FL

Hedden, SL
Assistant Professor of Agricultural EngineeringProfessor of EntomologyAgricultural Engineer, University of FloridaUSDA/ARSCitrus Research and Education Center, Lake Alfred, FL

Pages: 10    Published: Jan 1989

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Abstract

A field test was conducted to determine the deposition characteristics and biological efficacy of 4 different spray volumes applied at 2.4 km/h with an airblast sprayer for control of the citrus rust mite. Five acaricides and a copper tracer were applied at 4,700, 940, 470, and 235 L/ha. Copper deposition on leaves was determined by colorimetry. Mite population counts were made one week prior to application and at 2, 4, 6, 8, and 10 weeks after treatment to estimate residual effect. Spray volume had no significant effect on mean copper deposition and citrus rust mite control. Higher spray volumes showed more uniform coverage than the lower volumes. Acaricidal efficacy differed between compounds, yet all were superior to the untreated check.