. The Cattle grubs or ox warbles, their biologies and suggestions for control. Warble flies; Cattle; Insect pests. 92 BULLETIN 1369, U. S. DEPARTMENT OF AGRICULTURE most cases applied with the fingers, care being taken to press some of the material into the apertures in the skin (fig. 34). The liquids were applied with hypodermic syringes, a blunt needle being used and care being taken not to injure the grub; with oil cans (fig. 35); with eye droppers; or in the form of a general wash thoroughly ap- plied to the backs of the cattle with a stiff brush. In preliminary tests with all of the mater
. The Cattle grubs or ox warbles, their biologies and suggestions for control. Warble flies; Cattle; Insect pests. 92 BULLETIN 1369, U. S. DEPARTMENT OF AGRICULTURE most cases applied with the fingers, care being taken to press some of the material into the apertures in the skin (fig. 34). The liquids were applied with hypodermic syringes, a blunt needle being used and care being taken not to injure the grub; with oil cans (fig. 35); with eye droppers; or in the form of a general wash thoroughly ap- plied to the backs of the cattle with a stiff brush. In preliminary tests with all of the materials the cattle were numbered and a dia- gram made of the distribution of the grubs on the back, each grub being numbered and the stage of development determined before the application was made. In some instances the hair was clipped from around the openings in the hide; but the results in each case were checked afterwards by the treatment of other infestations in Fig. 34.—Applying ointment to grubs in back of heifer which the hair was left undisturbed immediately around the holes and the position of the grubs marked by clipping the hair below each of them. In injecting the materials into the cysts an effort was made to fill the cavity around the grub with the liquid. The average quantity used was something less than 1 cubic centimeter per grub. In order to determine the results of the treatment in the early experi- ment, each grub was carefully examined from four to six days after the treatment was made. Then the larvae were extracted and notes made on their condition and the condition of the lesions produced by them. Following the preliminary tests, large numbers of grubs were treated without determining the stage they were in or otherwise in- terfering with them before the application. The percentage of mor- tality in some cases was determined merely by continued observation. Please note that these images are extracted from scanned page images that may have been digita
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Keywords: ., bookcentury1900, bookdecade1920, booksubj, booksubjectinsectpests
