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The use of cottonseed or soybean oil as a diluent is becoming increasingly important in ultralow-volume (ULV) application of pesticides. Guthion 2L is registered for ULV application, so it was of interest to study the variables that could affect the flow rates of Guthion 2L oil mixtures through various nozzle tips.
The tests were conducted with a carbon dioxide hand sprayer, with the viscosity, temperature, and pressure as variables.
The mixtures used were 0.235 to 0.47 L (½ to 1 pt) of Guthion 2L in 0.47 to 0.705 L (1 to 1 ½ pt) of cottonseed oil. In each evaluation, the total volume was ∼0.94 L (2 pt). The temperature ranged from 23.9 to 48.9°C (75 to 120°F) and the pressures from 206.8 to 275.8 kPa (30 to 40 psi). Nozzle tips Nos. 8002, 8003, and 8004 were used.
In summary, whenever the ratio of Guthion 2L to cottonseed oil was 1:1, the temperature and viscosity had little effect on the flow rate. If the ratio was changed to 0.235 L (½ pt) of Guthion 2L to 0.705 L (1 ½ pt) of cottonseed oil, there was a significant change in the flow rate through the nozzle tip in relation to the temperature. It appears from the data that a flowmeter may be a necessity to avoid application problems.
pesticides, cottonseed oil, ultralow-volume (ULV) application, Guthion 2L, nozzle tips, flow rates, oil mixtures
Agricultural formulation chemist, Mobay Chemical Corp., Kansas City, Mo.