Effects of Timing and Method of Application on Efficiency of Co-Ral Sprays for Cattle Grub Control

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Abstract
When cattle were sprayed with 0.5% Co-Ral® (0-(3-chloro-4- Methylumbelliferonc) 0,0-dicthyl phosphorothioate) at monthly intervals from May through September, there was no relationship between control and time of treatment. In other experiments with grown animals control ranged from 87.5% for ¾gallon of 0.4% to 90% for 1 gallon of 0.5%, applied at a pressure of 300 pounds per square inch, but control obtained by treating calves lightly (approximately 1 quart) was only 31%. In further tests with 0.5% no differences were noted between ½ to 1½ gallons appeared at 250 pounds and 1 gallon at 250 or 500 pounds per square inch. Except for the calves, cattle in all tests were in Summer coat and appeared to be wet to the skin by the minimum volume and pressure.

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