New Formulation of Coumaphos 



For many years arsenicals were used as the acaricide 

 in official U.S. ticl< Eradication Program work. Because 

 of environmental hazards of arsenic residues in the 

 formulation used to dip cattle, use of arsenical 

 solutions was discontinued in 1973. 



Coumpahos, formulated as CoRal® Animal Insecticide 

 25% Wettable Powder, was selected in 1969 for use in 

 official Tick Eradication Programs. Coumaphos has 

 proven to be a very effective acaricide. The wettable 

 powder formulation does have an undesirable 

 characteristic; i.e., very rapid settline out of 

 suspension. This settling out characteristic makes 

 dipping vat management difficult. 



Bayvet Corporation is now marketing a flowable 

 formulation of coumaphos, CoRal® Flowable Cattle 

 Insecticide. The flowable formulation is equally 

 effective against ticks and virtually eliminates the 

 problems of settling out of the suspension. 

 Unfortunately, the current registered label for flowable 

 coumaphos does not list horses as an animal that may 

 be treated. 



movements. In the event that part of the ranch 

 becomes tick infested, the infestation can be defined 

 and eradicated rapidly. 



If one or more pastures are at high risk to ticks, always 

 have the livestock from such pastures inspected and 

 dipped by tick program personnel before moving these 

 livestock to other pastures. 



When purchasing new animals— be safe. Have the new 

 animals inspected and dipped before bringing them 

 onto the ranch. 



Horses at risk to ticks should be on 14-day treatment 

 to prevent the introduction of ticks. Ask the tick 

 program personnel if your horses should be on a "14- 

 day pass." 



Livestock owners ranching in high-risk areas of tick 

 infestation should always be alert to the possibility of 

 tick infestation. They should take special precautions 

 to prevent the introduction and spread of ticks. 



The Tick Force currently has three vats charged with 

 the flowable formulation of coumaphos. Samples are 

 taken from the vats each time animals are dipped, and, 

 to date, all samples have been within the recommended 

 pesticide concentration. As the supply on hand of 

 wettable powder is depleted, additional vats will be 

 charged with the flowable coumaphos. 



Use of the flowable formulation of coumaphos should 

 result in more efficient vat management and ensure 

 that all animals are treated with the recommended 

 concentration of pesticide. 



Suggestions to Protect Livestock from 

 Boophilus Ticlts 



According to Dr. John Gray, Tick Epidemiologist, South 

 Central Region, prevention of tick infestation starts with 

 the livestock owner. No State or Federal agency can 

 provide the day-to-day protective measures that the 

 owner can provide. 



Prevention starts with good fences that keep the 

 livestock on clean, non-infested land and protect the 

 ranch from becoming exposed to tick-infested stray 

 livestock. 



Domestic livestock, principally cattle, are usually 

 responsible for spreading ticks. Know the movements 

 of livestock within the ranch and maintain records of 



