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  worms. 
  Against 
  cutworms, 
  poisoned 
  bait 
  made 
  by 
  cutting 
  up 
  clover 
  

   that 
  has 
  been 
  sprayed 
  with 
  Paris 
  green 
  at 
  the 
  rate 
  of 
  1 
  oz. 
  to 
  6 
  gallons 
  

   should 
  be 
  scattered 
  in 
  the 
  field 
  a 
  couple 
  of 
  days 
  before 
  the 
  tobacco 
  

   is 
  transplanted. 
  The 
  spray 
  recommended 
  for 
  use 
  against 
  cutworms 
  

   and 
  tobacco 
  worms 
  is 
  made 
  with 
  from 
  4 
  to 
  5 
  lb. 
  arsenate 
  of 
  

   lead 
  paste 
  to 
  50 
  gallons 
  of 
  water 
  ; 
  one 
  man 
  with 
  a 
  compressed 
  air 
  

   sprayer 
  should 
  be 
  able 
  to 
  apply 
  this 
  mixture 
  to 
  about 
  2 
  acres 
  of 
  tobacco 
  

   a 
  day 
  ; 
  the 
  poison 
  costs 
  from 
  l^d. 
  to 
  lOd. 
  a, 
  pound. 
  

  

  Pratt 
  (H. 
  C). 
  Locust 
  spraying 
  experiments.— 
  .4^nc. 
  Bull. 
  F.M.S., 
  

   Kuala 
  Lumpur, 
  ii, 
  no.|10, 
  May 
  1914, 
  pp. 
  249-255. 
  

  

  ^ 
  . 
  This 
  is 
  a 
  detailed 
  report 
  of 
  spraying 
  with 
  arsenite 
  of 
  soda, 
  London 
  

   purple 
  and 
  Paris 
  green, 
  " 
  Four 
  Oaks 
  " 
  knapsack 
  sprayers 
  being 
  

   used. 
  Twenty- 
  two 
  experiments 
  were 
  made, 
  of 
  which 
  eighteen 
  are 
  

   recorded. 
  The 
  cheapest 
  and 
  most 
  effective 
  solution 
  of 
  arsenite 
  of 
  

   soda 
  was 
  made 
  by 
  dissolving 
  1 
  lb. 
  of 
  arsenite 
  in 
  1 
  gal. 
  of 
  water, 
  diluted 
  

   with 
  4 
  gals, 
  of 
  water 
  for 
  use. 
  In 
  one 
  experiment 
  the 
  arsenite 
  was 
  

   dissolved 
  by 
  boiling 
  in 
  1 
  gal. 
  of 
  water, 
  and 
  after 
  diluting 
  with 
  4 
  gals, 
  

   of 
  water, 
  3 
  lb. 
  of 
  molasses 
  were 
  added. 
  The 
  locusts 
  were 
  enclosed 
  

   in 
  an 
  area 
  of 
  12 
  square 
  yards, 
  sparsely 
  covered 
  with 
  short 
  grass. 
  

   The 
  solution 
  was 
  sprayed 
  at 
  11.25 
  a.m. 
  in 
  the 
  hot 
  sun. 
  Only 
  a 
  little 
  

   rain 
  fell 
  after 
  spraying. 
  Practically 
  100 
  per 
  cent, 
  of 
  the 
  locusts 
  were 
  

   dead 
  at 
  5 
  p.m. 
  In 
  another 
  experiment 
  only 
  21b. 
  of 
  molasses 
  were 
  

   used. 
  When 
  high 
  lalang 
  grass 
  full 
  of 
  4th 
  instar 
  locusts 
  was 
  sprayed 
  

   there 
  was 
  no 
  sign 
  of 
  living 
  locusts 
  the 
  follomng 
  morning, 
  though 
  a 
  

   few 
  dead 
  ones 
  were 
  found, 
  but 
  owing 
  to 
  the 
  thick 
  lalang 
  and 
  the 
  fact 
  

   that 
  the 
  locusts 
  had 
  probably 
  scattered 
  it 
  was 
  difficult 
  to 
  see 
  them. 
  

   In 
  another 
  case 
  1 
  lb. 
  of 
  arsenite 
  was 
  dissolved 
  in 
  1 
  gal. 
  of 
  water, 
  to 
  

   which 
  4 
  gals, 
  of 
  water 
  and 
  1 
  lb. 
  of 
  molasses 
  were 
  added. 
  This 
  was 
  

   used 
  on 
  a 
  fairly 
  large 
  swarm 
  of 
  locusts 
  covering 
  about 
  4 
  acres, 
  

   where 
  there 
  was 
  little 
  grass 
  on 
  the 
  ground, 
  though 
  it 
  was 
  surrounded 
  

   by 
  lalang 
  and 
  blukar 
  grass. 
  Two 
  sprayers 
  were 
  used 
  ; 
  a 
  belt 
  of 
  

   grass 
  5 
  or 
  6 
  yards 
  wide 
  was 
  first 
  sprayed 
  round 
  the 
  swarm 
  and 
  

   then 
  the 
  inner 
  area 
  was 
  treated. 
  Spraying 
  was 
  conducted 
  between 
  8 
  

   and 
  11 
  a.m. 
  in 
  hot 
  sun, 
  heavy 
  rain 
  falHng 
  at 
  3 
  p.m. 
  By 
  1 
  p.m. 
  

   many 
  locusts 
  were 
  dead 
  and 
  practically 
  the 
  swarm 
  had 
  perished 
  by 
  

   5 
  p.m. 
  

  

  From 
  the 
  results 
  obtained 
  with 
  London 
  purple 
  it 
  is 
  apparent 
  that 
  

   mixtures 
  containing 
  1 
  lb. 
  of 
  this 
  poison 
  in 
  either 
  6 
  or 
  12 
  gals, 
  of 
  water 
  

   are 
  the 
  only 
  ones 
  likely 
  to 
  be 
  of 
  use 
  in 
  the 
  field. 
  In 
  one 
  experiment 
  

   1 
  lb. 
  of 
  London 
  purple 
  was 
  mixed 
  with 
  12 
  gals, 
  of 
  cold 
  water 
  and 
  

   4 
  lb. 
  of 
  molasses 
  were 
  added. 
  The 
  locusts 
  were 
  enclosed 
  in 
  an 
  area 
  

   of 
  12 
  square 
  yards, 
  over 
  which 
  there 
  was 
  a 
  fair 
  amount 
  of 
  short 
  grass. 
  

   Spraying 
  was 
  effected 
  at 
  11.45 
  a.m. 
  in 
  the 
  hot 
  sun. 
  About 
  70 
  per 
  

   cent, 
  of 
  the 
  locusts 
  were 
  dead 
  at 
  5.10 
  p.m. 
  on 
  the 
  same 
  day, 
  and 
  by 
  

   10 
  a.m. 
  next 
  morning 
  every 
  individual 
  had 
  perished. 
  The 
  experiment 
  

   w^as 
  repeated 
  with 
  half 
  the 
  amount 
  of 
  water, 
  viz., 
  6 
  gals., 
  all 
  other 
  

   conditions 
  being 
  similar, 
  except 
  that 
  spraying 
  took 
  place 
  earUer 
  in 
  the 
  

   day, 
  at 
  10.15 
  a.m. 
  About 
  70 
  per 
  cent, 
  of 
  the 
  locusts 
  were 
  dead 
  at 
  

   5.20 
  p.m. 
  on 
  the 
  same 
  day 
  and 
  98 
  per 
  cent, 
  the 
  next 
  morning 
  at 
  

   10 
  a.m. 
  

  

  