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  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  VINEYARD 
  EXPERIMENTS 
  WITH 
  POISON 
  SPRAYS 
  IN 
  1909. 
  

  

  The 
  spray 
  work 
  for 
  1909 
  was 
  conducted 
  in 
  the 
  same 
  vineyard 
  as 
  in 
  

   1907 
  and 
  1908. 
  The 
  plat 
  arrangement 
  was 
  the 
  same 
  as 
  in 
  1908. 
  The 
  

   unsprayed 
  check 
  vines 
  were 
  also 
  in 
  the 
  same 
  location 
  as 
  in 
  1908. 
  

   (See 
  fig. 
  21.) 
  The 
  same 
  gasoline-engine 
  spraying 
  outfit 
  was 
  used 
  as 
  

   in 
  the 
  two 
  previous 
  seasons 
  and 
  the 
  nozzle 
  arrangement 
  was 
  also 
  the 
  

   same. 
  A 
  pressure 
  of 
  from 
  100 
  to 
  125 
  pounds 
  was 
  maintained 
  and 
  

   about 
  100 
  gallons 
  of 
  spray 
  were 
  applied 
  per 
  acre. 
  The 
  first 
  applica- 
  

   tion 
  was 
  made 
  on 
  Plats 
  I 
  and 
  II 
  June 
  8, 
  just 
  before 
  the 
  blossom 
  buds 
  

   opened. 
  The 
  second 
  application 
  was 
  made 
  June 
  28, 
  after 
  blossoming, 
  

   when 
  the 
  berries 
  were 
  about 
  the 
  size 
  of 
  buckshot. 
  At 
  this 
  date 
  all 
  

   four 
  plats 
  were 
  sprayed. 
  Plat 
  II 
  was 
  given 
  a 
  double 
  spraying 
  on 
  

   this 
  date. 
  The 
  other 
  plats 
  received 
  only 
  one 
  application 
  at 
  each 
  date 
  

   throughout 
  the 
  season. 
  All 
  four 
  plats 
  were 
  spra}^ed 
  July 
  9, 
  when 
  the 
  

   berries 
  were 
  large 
  enough 
  to 
  touch 
  each 
  other 
  in 
  the 
  cluster. 
  (See 
  

   Table 
  XXVII, 
  showing 
  spray 
  formula 
  and 
  number 
  of 
  applications.) 
  

  

  Table 
  XXVII. 
  — 
  Spray 
  formula 
  and 
  dates 
  of 
  applications 
  against 
  larvx 
  of 
  the 
  grape- 
  

   berry 
  moth. 
  Vineyard 
  of 
  Mr. 
  W.S. 
  Wheeler, 
  North 
  East, 
  Pa., 
  1909. 
  

  

  Plat 
  No. 
  

  

  Spray 
  formula. 
  

  

  Number 
  

   of 
  spray 
  

   applica- 
  

   tions. 
  

  

  Date 
  of 
  application. 
  

  

  I 
  

  

  Three 
  pounds 
  arsenate 
  of 
  lead 
  to 
  50 
  gallons 
  of 
  Bordeaux 
  

   mixture. 
  

   . 
  . 
  .do. 
  

  

  3 
  

  

  3 
  

   2 
  

   2 
  

  

  June 
  8, 
  28; 
  July 
  9. 
  

   Do. 
  

  

  II 
  

  

  Ill 
  

  

  ...do 
  

  

  June 
  28; 
  July 
  9. 
  

   Do. 
  

  

  IV 
  

  

  ....do 
  

  

  Va-Vb... 
  

  

  

  

  

  

  

  

  Counts 
  of 
  infested 
  berries 
  were 
  made 
  on 
  25 
  vines 
  in 
  each 
  of 
  the 
  

   unsprayed 
  check 
  plats 
  and 
  also 
  in 
  each 
  of 
  the 
  sprayed 
  plats. 
  (See 
  

   Table 
  XXVIII, 
  showing 
  progress 
  of 
  infestation 
  for 
  season 
  of 
  1909.) 
  

  

  Table 
  XXVIII. 
  — 
  Progress 
  of 
  infestation 
  of 
  fruit 
  by 
  larvx 
  of 
  the 
  grape-berry 
  moth 
  in 
  

   experimental 
  plats. 
  Vineyard 
  of 
  Mr. 
  W. 
  S. 
  Wheeler, 
  North 
  East, 
  Pa., 
  1909. 
  

  

  FIRST 
  COUNT 
  OF 
  INFESTED 
  BERRIES, 
  MADE 
  ON 
  JULY 
  25. 
  

  

  Plat 
  No. 
  

  

  Date 
  of 
  spray 
  application. 
  

  

  Spray 
  formula. 
  

  

  Number 
  

   of 
  appli- 
  

   cations. 
  

  

  Number 
  

   of 
  vines 
  

   exam- 
  

   ined. 
  

  

  Number 
  

  

  of 
  infested 
  

  

  berries. 
  

  

  I 
  

  

  June 
  8, 
  28, 
  July 
  9 
  

  

  do 
  

  

  5-5-3-50 
  

  

  3 
  

   3 
  

   2 
  

   2 
  

  

  25 
  

   25 
  

   25 
  

   25 
  

  

  23 
  

  

  11 
  

  

  5-5-3-50. 
  . 
  . 
  

  

  14 
  

  

  Ill 
  

  

  June 
  28, 
  July9 
  

  

  do 
  

  

  5-5-3-50 
  

  

  17 
  

  

  IV 
  

  

  5-5-3-50 
  

  

  12 
  

  

  

  

  

  

  SECOND 
  COUNT 
  OF 
  INFESTED 
  BERRIES, 
  MADE 
  ON 
  SEPTEMBER 
  21 
  TO 
  24. 
  

  

  I 
  

  

  June 
  8,28, 
  July 
  9.. 
  

  

  5-5-3-50. 
  

  

  3 
  

   3 
  

   2 
  

   2 
  

  

  25 
  

   25 
  

   25 
  

   25 
  

  

  750 
  

  

  II 
  

  

  do 
  ..... 
  

  

  5-5-3-50 
  

  

  396 
  

  

  Ill 
  

  

  June 
  28, 
  July 
  9 
  . 
  . 
  

  

  5-5-3-50 
  

  

  550 
  

  

  IV 
  

  

  do 
  

  

  K-fi-A-JWl 
  

  

  390 
  

  

  

  1 
  

  

  

  