﻿LIME-SULPHUR 
  A 
  STOMACH 
  POISON 
  FOR 
  INSECTS. 
  

  

  89 
  

  

  Table 
  VII. 
  — 
  Tests 
  of 
  the 
  killing 
  effect 
  of 
  lime-sulphur 
  on 
  the 
  pear 
  slug 
  (Eriocampoides 
  

  

  cerasi 
  L.). 
  

  

  (Experiment 
  started 
  Aug. 
  24, 
  1912, 
  Benton 
  Harbor, 
  Mich., 
  6 
  larva? 
  in 
  each 
  lot.] 
  

  

  Date 
  of 
  examination. 
  

  

  Larva? 
  dying 
  in 
  each 
  lot. 
  

  

  Lot 
  1 
  (6 
  

   larvae)— 
  Check 
  

   (unsprayed). 
  

  

  Lot 
  2 
  (6 
  

   larva?) 
  — 
  Lime- 
  

   sulphur, 
  l£-50. 
  

  

  Lot 
  3 
  (6 
  

   larvn?)— 
  Lime- 
  

   sulphur, 
  1.^-50. 
  

  

  Aug. 
  25 
  

  

  

  3 
  

   2 
  

   1 
  

  

  

  26 
  

  

  

  4 
  

   2 
  

  

  27 
  

  

  

  28 
  

  

  29 
  

  

  

  

  

  

  Total 
  number 
  dead... 
  

   Number 
  of 
  days 
  required 
  to 
  

  

  kill 
  

  

  Square 
  inches 
  of 
  foliage 
  

  

  consumed 
  

  

  

  

  

   1.69 
  

  

  6 
  

   3 
  

  

  0.08 
  

  

  6 
  

  

  3 
  

  

  0.05 
  

  

  Three 
  days 
  were 
  required 
  to 
  kill 
  all 
  the 
  larvae 
  on 
  the 
  sprayed 
  lots. 
  

   At 
  the 
  end 
  of 
  five 
  days, 
  when 
  the 
  experiment 
  was 
  closed, 
  the 
  larvae 
  

   on 
  the 
  unsprayed 
  lot 
  were 
  apparently 
  in 
  a 
  normal 
  condition. 
  

  

  MISCELLANEOUS 
  TESTS. 
  

  

  Preparations 
  were 
  made 
  to 
  conduct 
  a 
  number 
  of 
  feeding 
  experi- 
  

   ments 
  on 
  the 
  killing 
  effect 
  of 
  lime-sulphur 
  on 
  the 
  second 
  brood 
  of 
  

   codling-moth 
  larvae 
  (Carpocapsa 
  pomonella 
  L.). 
  But 
  since 
  a 
  suffi- 
  

   cient 
  number 
  of 
  larvae 
  was 
  not 
  obtainable, 
  owing 
  to 
  the 
  small 
  size 
  of 
  

   this 
  brood 
  appearing 
  in 
  Michigan, 
  no 
  satisfactory 
  tests 
  could 
  be 
  

   made. 
  Neither 
  were 
  there 
  any 
  tests 
  with 
  lime-sulphur 
  alone 
  made 
  

   against 
  this 
  insect 
  in 
  the 
  field. 
  However, 
  in 
  the 
  case 
  of 
  a 
  plat 
  of 
  

   Ben 
  Davis 
  apples, 
  sprayed 
  three 
  times 
  with 
  lime-sulphur, 
  1-50, 
  and 
  

   10 
  per 
  cent 
  kerosene 
  emulsion, 
  no 
  arsenical 
  being 
  used, 
  the 
  total 
  

   percentage 
  of 
  windfalls 
  and 
  picked 
  fruit 
  free 
  from 
  the 
  codling 
  moth 
  

   was 
  90.18, 
  as 
  against 
  41.31 
  per 
  cent 
  of 
  fruit 
  free 
  from 
  this 
  insect 
  on 
  

   the 
  unsprayed 
  plat. 
  Lime-sulphur, 
  1-50, 
  and 
  fish-oil 
  soap, 
  7 
  pounds 
  

   to 
  50, 
  without 
  an 
  arsenical, 
  in 
  the 
  same 
  orchard 
  held 
  the 
  codling 
  

   moth 
  to 
  88.19 
  per 
  cent 
  of 
  sound 
  fruit. 
  The 
  effectiveness 
  of 
  lime- 
  

   sulphur 
  alone 
  in 
  controlling 
  the 
  codling 
  moth 
  and 
  numerous 
  other 
  

   insects 
  will 
  be 
  further 
  tested 
  during 
  the 
  season 
  of 
  1913. 
  

  

  A 
  few 
  laboratory 
  tests 
  were 
  made 
  of 
  the 
  killing 
  effect 
  of 
  Bordeaux 
  

   mixture, 
  3-4-50, 
  on 
  the 
  fall 
  webworm 
  and 
  about 
  as 
  effective 
  results 
  

   were 
  obtained 
  as 
  from 
  lime-sulphur 
  solutions. 
  

  

  Self-boiled 
  lime-sulphur, 
  8-8-50, 
  the 
  preparation 
  used 
  for 
  spraying 
  

   peaches 
  in 
  foliage, 
  was 
  tried 
  against 
  the 
  fall 
  webworm 
  without 
  any 
  

   killing 
  effect. 
  Sulphur 
  alone, 
  8-50, 
  and 
  lime 
  alone, 
  8-50, 
  likewise 
  

   were 
  ineffective. 
  

  

  