September   19U3  E-60? 
 
 United    States  .Department  of  Agriculture 
 
 Agricultural   Hesearch  Administration 
 
 Bureau   of  Entomology   and  Plant  Quarantine 
 
 and 
 
 Bureau  of  Animal   Industry 
 
 BOTE170NE  SEDUCED  IN  DUSTS  FOB  CATTLE  GEUS   TBZATMZ.TS 
 
 Treatments  of  cattle  made  for  control  of  cattle  grubs   show  that   rotenone 
 dusts  mixed  with   tripoli    earth  or  with  pyrophylli te   are  more   efficient   than 
 those  made  with  talc  and   sulfur,    because   they  penetrate   the  hair  better  and 
 also  because   twice  as  many  animals   cr  more  can  be   treated  with  the    B 
 amount   of  derrie.      The  results  obtained  with   these   dust  mixtures   in  Wyoi 
 were  comparable   to   those   obtained   in  Texas  and  Florida.      They   show  that   the 
 northern  animals  with  thick  coats  of  hair  are  treated  just  as  effectively  as 
 ara   the  a.nimals  with   short  hair.      It  waa  also  found   that  mixtures  of  ground 
 cube  were  as  effective  as  those  made  with  ground  derri s  root  when  the  dusts 
 contained  the  same  percentage  of  rotenone. 
 
 When  applied  with  a  shaker  can,   an  peerage  application  of  2  to  3  our.c 
 of  the  raixad  powder  is   sufficient  for  n    single   treatment   of  an  animal   wit 
 heavy  coat  of  hair.      The  en  or  jar  is  provided  with  a  close— fitting  top   in 
 which  about   15  hol^s,    one-fourth  inch  in  *    :,    are  punched  outward 
 
 through   the   lid.      At   the   time   the   dust   is  applied,    or.  tc    ruffle 
 
 the  hair.     This  permits  th<=  dust  to  penetrate   the  haiJ  iter  the  or 
 
 of  the  cysts   that  contain  the  grubs.     The  success  of   the   treatment   is  dot)' 
 uuon   the   thoroughness  with  which  the  powder  is  worked   into  Zn  t 
 
 use   of   such  a  method  two   men  working  on  opposite   sides   of  n  chute  have 
 tod  100  cattle  in  an  hour.     Because  of   thp  excrll^nt  results   obtc:: 
 with  pyrophylli te  and  tripoli    earth  as  dry   diluents,    either  of  thei  alt 
 
 is  recommended  for  use  in  dusts  for  cattle   grub  control   m.'   as  n  rqaAI   of 
 greatly   extending   the  use   of   the   avail-    1 
 
 Formula  for  Making  Dusts  with  Pyrophylli  te   or  Ti 
 
 Ground  cubr-    or   derri  s  (5  percent  rot  1  pnrt  v 
 
 )li  earth  i/  (aOO-raesh  fiasnsss) 3  parti 
 
 -r 
 
 Ground  cube  or  derri  s  (5  percent  rotenone) 1  pari 
 
 Pyrophylli t*»  2/  (}2^r.^eh   fineness) 
 
 sf   Tho  tripoli  earth  to  be  u?-  '  is  t   •  •  rose 
 
 tripoli. 
 
 SI   She 
 
UNIVERSITY  OF  FLORID 
 
 lllillll 
 
 3  1262  09239  1340 
 
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