﻿LIME-SULPHUR 
  A 
  STOMACH 
  POISON 
  FOR 
  INSECTS. 
  

  

  85 
  

  

  Table 
  III. 
  — 
  Tests 
  of 
  the 
  killing 
  effect 
  on 
  the/all 
  webworm 
  of 
  lime-sulphur 
  in 
  comparison 
  

  

  with 
  arsenate 
  of 
  lead. 
  

  

  [Experiment 
  started 
  August 
  8, 
  1912, 
  Benton 
  Harbor, 
  Mich., 
  20 
  larvae 
  in 
  each 
  lot.] 
  

  

  

  Larvse 
  dying 
  in 
  each 
  lot. 
  

  

  Date 
  of 
  examination. 
  

  

  Lotl— 
  

   Check 
  

   (on- 
  

   spray- 
  

   ed). 
  

  

  Lot 
  

   2— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   *-50. 
  

  

  Lot 
  

   3— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   1-50. 
  

  

  Lot 
  

  

  4— 
  

  

  Lime- 
  

  

  Ktll- 
  

  

  phur, 
  

   1J-50. 
  

  

  Lot 
  

   5— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   2-50. 
  

  

  Lot 
  

   6— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   3-50. 
  

  

  Lot 
  

   7— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   5-50. 
  

  

  Lot 
  

  

  8- 
  

   Lime- 
  

  

  sul- 
  

   phur, 
  

   6-50. 
  

  

  Lot 
  

  

  9— 
  

   Arse- 
  

   nate 
  

  

  of 
  

   lead, 
  

   i-50. 
  

  

  Lot 
  

   10— 
  

   Arse- 
  

   nate 
  

   of 
  

   lead, 
  

   1-50. 
  

  

  Lot 
  

   11— 
  

   Arse- 
  

   nate 
  

   of 
  

   lead, 
  

   2-50. 
  

  

  Lot 
  

   12— 
  

   Arse- 
  

   nate 
  

   of 
  

   lead, 
  

   5-50. 
  

  

  Aug. 
  10 
  

  

  

  

  

  

  

  

  

  2 
  

   3 
  

   11 
  

   4 
  

  

  ...... 
  

  

  11 
  

   3 
  

   4 
  

  

  2 
  

   2 
  

   10 
  

   2 
  

   4 
  

  

  8 
  

  

  11 
  

  

  1 
  

  

  4 
  

  

  12 
  

  

  

  

  

  

  

  

  1 
  

   6 
  

   6 
  

  

  15 
  

  

  14 
  

  

  

  1 
  

   3 
  

   2 
  

   8 
  

   6 
  

  

  4 
  

  

  8 
  

   8 
  

  

  5 
  

   13 
  

   2 
  

  

  2 
  

   6 
  

   8 
  

   4 
  

  

  3 
  

   6 
  

   11 
  

  

  1 
  

  

  1(1 
  

  

  

  

  18 
  

  

  

  

  

  20 
  

  

  

  

  

  

  22 
  

  

  

  

  

  

  

  1 
  

  

  

  

  

  Sept. 
  2 
  

  

  2 
  

   3 
  

   2 
  

  

  

  

  

  

  

  

  

  

  

  

  10 
  

  

  

  

  

  

  

  

  

  

  

  

  

  Oct. 
  19 
  

  

  

  

  

  

  

  

  ::::::i:: 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Total 
  number 
  dead. 
  

  

  Number 
  days 
  required 
  to 
  

  

  kill 
  

  

  7 
  

  

  20 
  

  

  14 
  

  

  3.92 
  

  

  20 
  

  

  10 
  

  

  0.3G 
  

  

  20 
  

  

  10 
  

  

  0.17 
  

  

  20 
  

  

  12 
  

  

  1.01 
  

  

  20 
  

  

  10 
  

  

  0.81 
  

  

  20 
  

  

  10 
  

   0.73 
  

  

  20 
  

  

  8 
  

  

  0.26 
  

  

  20 
  

   14 
  

  

  2.38 
  

  

  20 
  

   10 
  

  

  1.98 
  

  

  20 
  

   6 
  

  

  0.11 
  

  

  20 
  

   6 
  

  

  Square 
  inches 
  of 
  foliage 
  

  

  119.00 
  

  

  0. 
  10 
  

  

  

  

  It 
  will 
  be 
  noted 
  that 
  lime-sulphur, 
  |-50, 
  killed 
  the 
  20 
  larvae 
  in 
  14 
  

   days, 
  the 
  same 
  length 
  of 
  time 
  required 
  by 
  arsenate 
  of 
  lead, 
  ^— 
  50. 
  

   Also 
  lime-sulphur, 
  1-50, 
  killed 
  the 
  larvae 
  in 
  the 
  same 
  length 
  of 
  time 
  

   as 
  arsenate 
  of 
  lead 
  1-50, 
  the 
  time 
  required 
  being 
  10 
  days. 
  However, 
  

   in 
  both 
  instances 
  the 
  arsenate 
  of 
  lead 
  killed 
  more 
  rapidly 
  in 
  the 
  

   beginning 
  than 
  the 
  lime-sulphur. 
  Eight 
  days 
  were 
  required 
  by 
  

   lime-sulphur, 
  6-50, 
  to 
  kill 
  the 
  20 
  larvae 
  as 
  against 
  6 
  days 
  required 
  by 
  

   arsenate 
  of 
  lead, 
  5-50. 
  The 
  amount 
  of 
  feeding 
  varied 
  somewhat 
  in 
  

   this 
  experiment, 
  the 
  largest 
  amount 
  on 
  the 
  sprayed 
  lots 
  being 
  3.92 
  

   square 
  inches 
  where 
  lime-sulphur, 
  J-50 
  was 
  used, 
  and 
  the 
  smallest 
  

   amount 
  being 
  0.10 
  of 
  a 
  square 
  inch 
  in 
  lot 
  12 
  which 
  was 
  sprayed 
  with 
  

   arsenate 
  of 
  lead, 
  5-50. 
  

  

  Experiment 
  IV. 
  

  

  The 
  object 
  of 
  experiment 
  IV 
  was 
  to 
  obtain 
  data 
  on 
  the 
  relation 
  of 
  

   the 
  killing 
  effect 
  of 
  arsenate 
  of 
  lead 
  alone 
  and 
  combined 
  with 
  lime- 
  

   sulphur, 
  and 
  to 
  obtain, 
  if 
  possible, 
  data 
  on 
  the 
  effect 
  the 
  addition 
  of 
  

   oik 
  4 
  to 
  the 
  other 
  has 
  upon 
  the 
  rapidity 
  of 
  killing. 
  Lime-sulphur 
  

   alone 
  was 
  used 
  at 
  four 
  different 
  strengths, 
  and 
  also 
  was 
  combined 
  at 
  

   the 
  same 
  rates 
  with 
  arsenate 
  of 
  lead, 
  2-50. 
  The 
  lime-sulphur 
  

   strengths 
  employed 
  were 
  i-50, 
  f-50, 
  1J-50, 
  and 
  3-50. 
  Arsenate 
  of 
  

   lead, 
  alone, 
  was 
  tried 
  out 
  at 
  strengths 
  of 
  £-50, 
  1-50, 
  2-50, 
  3-50, 
  and 
  

   5 
  50, 
  and 
  also 
  at 
  the 
  same 
  strengths 
  was 
  combined 
  with 
  lime-sulphur, 
  

   1J- 
  60. 
  The 
  results 
  are 
  given 
  in 
  Tabic 
  IV. 
  

  

  