Ixodidae 
B oophilus annulatus (Say); the- cattle tick 
Kraneveld (89) in 1936 conducted two types of experiments to study the 
toxicity of aqueous derris-powder suspensions to ticks Of 'this species. 
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1. Ticks were immersed in suspensions containing various 
quantities of derris ponder for 5 tolO seconds and also fgr 15 
to 20 seconds. They were then 'removed, dried, and placed in 
tubes containing blood-saturated cotton wads, to offer them an 
opportunity to eat. The' ticks' were -observed twice each day to 
determine how lone; they lived after this, treatment. Controls 
were run on ticks dipped' ih' water, and oh untreated ticks. The 
results . . . indicate that the derris-T>6wder suspension must 
contain more than 0.076 -percent of rotenone to be effective. 
2. A steer infested with ticks was sprayed with a derris 
Suspension containing 0.1 percent of rotenone. Several dead 
ticks were found, on the animal 2 days after this treatment, 
but living ticks could be found even 3 weeks after the treat- 
ment. A second steer was washed with* a suspension containing 
0.2 percent of rotenone. Most of the ticks ^ere dead on the 
following day, and all were dead 3 weeks after the treatment. 
Meither animal- suffered any ill effects from this treatment. 
Kraneveld concluded that, since the : jothe£ treatments now used 
to free animals of ticks are effective and cheap, the price of 
derris would have to be Very low to be .practical end suggested 
that derris powder containing small quantities of rotenone that . 
could not be used for 'other purposes could be used to kill -ticks 
on cattle. 
. Kraneveld' s work was reported by D. W. Smith ( 138 ) , American Trade 
Commissioner at Batevia, Java, in 1938. 
D ermacentor andersoni Stiles (syn., D. venustus Banks) 
According to a release* by the Interdepartmental Safety Council published 
in the United State's Department of Agriculture, Agriculture Exchange (147) , 
if there is an animal pet in the family, it should be searched for ticks 
and should be dusted with 'derris powder. 
D ermacentor nigrolineatus -(Pack.), the brown winter tick 
Babcock (6) reported in 1936 that, in some preliminary tests with 
Te ohrosie r virginirna , examination on the third day after the "animal had 
been treated onoe showed that ell D. nigrolineatus infesting a horse had 
been killed. All but One of -a number of ticks of this snecies -placed in a 
box containing the -powdered material were^killer* in 31 hours. 
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Parish (118) in 12 40 reported that spraying cattle infested with the 
brown winter tick at Menard,' Tex.; "'ith the following mixture resulted in 
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