Evaluation of Jojoba Oil Formulations for Spwf Control on Cucumbers, 1992

Abstract

A small plot study was conducted in Weslaco, Texas to evaluate two formulations of jojoba oil for control efficacy against the SPWF on cucumbers. Experimental plots measured one row (40 in.) by 25 feet. Plots were separated by single row wind breaks of sudan grass. Treatments were initiated when plants were in approximately the 3 true leaf stage. Treatments consisted of jojoba oil mixed with lauryl sulfate and a premix jojoba oil. Applications were made with a CO2 pressurized backpack sprayer at 40 PSI, with 3 lOx hollow cone nozzles per row (1 overtop, 2 on drops) in a total volume of 50 GPA. Applications were made on 1, 7 and 12 Oct 1992. Adult SPWF were monitored 24 hours after each application by counting the number of adults on the first fully expanded leaf from the terminal on three plants in each plot. Immature stages were monitored on 9 and 14 Oct on two randomly selected plants per plot. Two leaves were removed from each plant (4th and 6th leaf from the terminal on 9 Oct; 5th and 7th leaf from the terminal on 14 Oct) and brought into the laboratory for counting. Two 2.2 cm diameter disks were cut from each leaf using a cork borer and the total number of immatures were counted on these disks (8 disks per plot).