﻿LIME-SULPHUR 
  A 
  STOMACH 
  POISON 
  FOR 
  INSECTS. 
  

  

  87 
  

  

  of 
  lead, 
  1-50, 
  2-50, 
  and 
  3-50, 
  each 
  killed 
  the 
  larvae 
  2 
  days 
  sooner 
  than 
  

   that 
  required 
  by 
  lime-sulphur, 
  1 
  J— 
  50. 
  Lime-sulphur, 
  1J-50, 
  when 
  

   added 
  to 
  the 
  various 
  strengths 
  of 
  arsenate 
  of 
  lead 
  did 
  not 
  appreciably 
  

   affect 
  the 
  rate 
  of 
  killing 
  of 
  the 
  arsenate 
  of 
  lead. 
  The 
  amount 
  of 
  feed- 
  

   ing 
  was 
  reduced 
  in 
  all 
  cases, 
  excepting 
  that 
  of 
  the 
  strongest 
  solution, 
  

   lot 
  14, 
  by 
  the 
  addition 
  of 
  lime-sulphur. 
  

  

  On 
  the 
  lots 
  sprayed 
  with 
  lime-sulphur, 
  J-50, 
  f-50, 
  li-50, 
  and 
  3-50, 
  

   combined 
  with 
  arsenate 
  of 
  lead, 
  2-50, 
  there 
  was 
  no 
  difference 
  in 
  the 
  

   length 
  of 
  time 
  required* 
  to 
  kill 
  the 
  larvae, 
  6 
  days 
  being 
  required 
  in 
  all 
  

   cases. 
  The 
  same 
  number 
  of 
  days 
  was 
  required 
  by 
  arsenate 
  of 
  lead 
  

   alone, 
  2-50, 
  but 
  the 
  rapidit\ 
  r 
  of 
  killing 
  was 
  somewhat 
  increased 
  by 
  the 
  

   addition 
  of 
  lime-sulphur. 
  

  

  Experiment 
  V. 
  

  

  In 
  an 
  experiment 
  to 
  obtain 
  data 
  on 
  the 
  sticking 
  qualities 
  of 
  various 
  

   sprays, 
  three 
  lots 
  of 
  the 
  regular 
  orchard 
  demonstration 
  strength 
  of 
  

   lime-sulphur, 
  l|-50, 
  were 
  used. 
  The 
  three 
  lots 
  were 
  thoroughly 
  

   sprayed 
  and 
  allowed 
  to 
  dry. 
  One 
  lot 
  was 
  then 
  washed 
  for 
  15 
  minutes 
  

   under 
  a 
  shower 
  bath, 
  by 
  placing 
  the 
  twig 
  just 
  above 
  the 
  floor 
  in 
  an 
  

   inclined 
  position, 
  allowing 
  the 
  water 
  to 
  fall 
  upon 
  it. 
  Another 
  lot 
  was 
  

   washed 
  30 
  minutes 
  in 
  the 
  same 
  manner, 
  while 
  the 
  third 
  lot 
  remained 
  

   unwashed. 
  

  

  The 
  same 
  procedure 
  was 
  carried 
  out 
  on 
  three 
  lots 
  of 
  arsenate 
  of 
  

   lead, 
  2-50. 
  After 
  the 
  twigs 
  were 
  again 
  thoroughly 
  dry 
  20 
  larvae 
  were 
  

   placed 
  on 
  each. 
  The 
  results 
  of 
  this 
  experiment 
  are 
  to 
  be 
  found 
  in 
  

   Table 
  V. 
  

  

  Table 
  V. 
  

  

  Tests 
  of 
  the 
  killing 
  effect 
  of 
  lime-sulphur 
  in 
  comparison 
  with 
  arsenate 
  of 
  lead 
  

   ajter 
  washing 
  oj 
  each. 
  

  

  [Experiment 
  started 
  

  

  August 
  4, 
  

  

  1912, 
  Benton 
  Harbor, 
  Mich., 
  20 
  larvae 
  in 
  each 
  lot.) 
  

  

  

  

  Larvae 
  dying 
  in 
  each 
  lot. 
  

  

  Date 
  of 
  examination. 
  

  

  Lotl— 
  

  

  Check 
  

  

  (un- 
  

  

  sprayed). 
  

  

  Lot 
  2— 
  

   Lime- 
  

   sulphur, 
  

   li-50; 
  

   not 
  

   washed. 
  

  

  Lot 
  3— 
  

   Lime- 
  

   sulphur, 
  

  

  1A-50; 
  

   washed 
  15 
  

   minutes. 
  

  

  Lot 
  4— 
  

   Lime- 
  

   sulphur, 
  

  

  li-50; 
  

   washed 
  30 
  

   minutes. 
  

  

  Lot 
  5— 
  

   Arsenate 
  

   oflead, 
  

   2-50; 
  

   not 
  

   washed. 
  

  

  Lot 
  6— 
  

  

  Arsenate 
  

  

  oflead, 
  

  

  2-50; 
  

  

  washed 
  15 
  

  

  minutes. 
  

  

  Lot 
  7— 
  

   Arsenate 
  

  

  oflead, 
  

  

  2-50; 
  

  

  washed 
  30 
  

  

  minuter 
  

  

  Aug. 
  7 
  

  

  

  

  

  

  1 
  

   12 
  

  

  

  

  9 
  

  

  

  

  

  

  2 
  

  

  4 
  

   5 
  

   9 
  

  

  

  11 
  

  

  

  2 
  

   2 
  

   12 
  

  

  4 
  

  

  2' 
  

  

  9 
  

   7 
  

   2 
  

  

  1 
  

   2 
  

   8 
  

   g 
  

  

  

  13 
  

  

  

  

  16 
  

  

  

  

  

  17 
  

  

  1 
  

  

  

  

  1<) 
  . 
  

  

  

  

  

  21 
  

  

  

  

  

  

  

  4 
  

  

  29 
  

  

  2 
  

   3 
  

   1 
  

  

  

  

  

  

  

  

  Burt, 
  '.i 
  

  

  

  

  

  

  

  

  is 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Total 
  Dumber 
  of 
  dead 
  

  

  Number 
  ol 
  day 
  i 
  required 
  to 
  kill 
  

  

  7 
  

  

  20 
  

   13 
  

  

  0.63 
  

  

  20 
  

  

  1.-, 
  

  

  1 
  . 
  M 
  

  

  20 
  

   IS 
  

  

  0.8* 
  

  

  20 
  

  

  7 
  

  

  20 
  

   11 
  

  

  1.711 
  

  

  ' 
  is 
  

  

  Square 
  Inches 
  of 
  UAv.u- 
  

  

  i 
  

  

  111. 
  (Ml 
  

  

  B 
  OQ 
  

  

  

  

  1 
  2 
  escaped. 
  

  

  