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Show Improved Sheep Dip Proves Production Aid Smaller Quantity of Derris Now Required T ATEST boon for sheep raisers comes from the U. S. department depart-ment of agriculture in the form of an effective, economical and easily prepared dipping solution for ridding rid-ding sheep of ticks. Six ounces of derris powder ' containing 5 per cent rotenone are mixed with a little water to make a thin paste and then diluted in 100 gallons of water. Cube powder, pow-der, also containing rotenone, may be substituted for derris. Despite the limited supply of rotenone currently being imported into the U. S., flock owners may arrange ar-range for allocations to suit their needs: Control of sheep ticks is one of the authorized uses. Less than half as much derris or cube powder is needed to kill sheep ticks as was formerly thought necessary. Dips made with derris or cube powders are not only easy to prepare, pre-pare, but save labor, since one dipping dip-ping is enough. Most other sheep dips commonly used required two , 1 y ' i Only Tick-Free Sheep Are Profitable. applications about 24 days apart, the first to kill adult tick and the second to kill the new crop. The rotenone in the new dip kills both the tick and the pupae in one dipping, dip-ping, and remains effective in the fleece for several weeks. Another advantage of the method meth-od is that unheated water from practically prac-tically any source can be used. The presence of alkali or clay does not reduce the effectiveness of the new dip. However, pure clean water is -best. Veterinarians of the department's bureau of animal industry studied the effects of dips of various strengths. None of the dipped sheep nor their fleece suffered any ill effects. |