﻿THE 
  GRAPE-BERRY 
  MOTH. 
  

  

  61 
  

  

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

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

  

  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 
  

  

  ofinfested 
  

  

  berries. 
  

  

  Va, 
  Vb 
  

  

  

  None 
  

  

  None. 
  

   None. 
  

   None. 
  

   None. 
  

  

  25 
  

   25 
  

   25 
  

   25 
  

  

  .34 
  

  

  Do 
  

  

  Do 
  

  

  '.'//Ao'//.V.V...V..../....... 
  

  

  do 
  

  

  do 
  

  

  28 
  

   21 
  

  

  Do 
  

  

  do 
  

  

  do 
  

  

  19 
  

  

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

  

  Va, 
  Vb 
  

  

  

  

  None. 
  

   None. 
  

   None. 
  

   None. 
  

  

  25 
  

   25 
  

   25 
  

   25 
  

  

  1,574 
  

  

  Do 
  

  

  Do 
  

  

  do 
  

  

  ..do 
  

  

  do 
  

  

  do 
  

  

  890 
  

   468 
  

  

  Do 
  

  

  ...do 
  

  

  do 
  

  

  1,168 
  

  

  

  

  

  

  The 
  counts 
  were 
  made 
  July 
  25 
  and 
  September 
  21 
  to 
  24. 
  The 
  

   infestation 
  this 
  season, 
  as 
  in 
  1907 
  and 
  1908, 
  was 
  heavier 
  on 
  the 
  south 
  

   side 
  of 
  Plat 
  I 
  and 
  on 
  the 
  east 
  end 
  of 
  the 
  east 
  section 
  and 
  became 
  

   lighter 
  toward 
  the 
  north 
  side 
  and 
  west 
  end 
  of 
  the 
  vineyard, 
  a 
  condi- 
  

   tion 
  which 
  existed 
  throughout 
  the 
  three 
  seasons. 
  

  

  When 
  the 
  crop 
  was 
  harvested 
  it 
  was 
  found 
  that 
  there 
  was 
  practic- 
  

   ally 
  no 
  difference 
  in 
  weight 
  of 
  fruit 
  per 
  acre 
  on 
  the 
  sprayed 
  and 
  the 
  

   unsprayed 
  vines. 
  Taking 
  the 
  vineyard 
  as 
  a 
  whole 
  the 
  infestation 
  

   was 
  very 
  much 
  lighter 
  than 
  in 
  either 
  of 
  the 
  preceding 
  seasons. 
  (See 
  

   Table 
  XXIX, 
  showing 
  percentage 
  of 
  infected 
  berries 
  on 
  fruit 
  from 
  25 
  

   vines 
  in 
  each 
  of 
  the 
  sprayed 
  and 
  the 
  unsprayed 
  plats.) 
  

  

  Table 
  XIX. 
  — 
  Percentage 
  of 
  grape 
  berries 
  infested 
  by 
  larvx 
  of 
  the 
  grape-berry 
  moth 
  on 
  

   25 
  innes 
  in 
  sprayed 
  and 
  unsprayed 
  plats. 
  Vineyard 
  of 
  Mr. 
  W. 
  S. 
  Wheeler, 
  North 
  East, 
  

   Pa., 
  1909. 
  

  

  SPRAYED. 
  

  

  Plat 
  

   No. 
  

  

  I... 
  

  

  II.. 
  

   III. 
  

   IV. 
  

  

  Dates 
  sprayed. 
  

  

  1909. 
  

  

  June 
  8, 
  28, 
  

   July 
  9. 
  

  

  do 
  

  

  June 
  28, 
  July 
  9.1 
  

  

  '!() 
  

  

  Num- 
  

   ber 
  of 
  

  

  times 
  

   sprayed 
  

  

  Formula. 
  

  

  -3-50. 
  

  

  --3-50. 
  

   2 
  5 
  5-3-50.. 
  

  

  Num- 
  

   ber 
  of 
  

   vines 
  

   exam- 
  

   ined 
  

  

  25 
  

  

  Total 
  

   number 
  

   of 
  

   clus- 
  

   ters. 
  

  

  1,512 
  

  

  1,242 
  

   1,203 
  

  

  1,288 
  

  

  Aver- 
  

   age 
  

   num- 
  

   ber 
  of 
  

   ber- 
  

   ries 
  

   per 
  

   clus- 
  

   ter. 
  

  

  Num 
  

   ber 
  of 
  

   infest- 
  

   ed 
  

   ber- 
  

   ries 
  

  

  7.-0 
  

  

  396 
  

  

  554 
  

  

  390 
  

  

  

  Per- 
  

  

  Total 
  

  

  cent- 
  

  

  number 
  

  

  age 
  of 
  

  

  of 
  

  

  in- 
  

  

  ber- 
  

  

  fested 
  

  

  ries. 
  

  

  ber- 
  

  

  

  ries. 
  

  

  57,456 
  

  

  1 
  . 
  30 
  

  

  47, 
  L96 
  

  

  .84 
  

  

  19,514 
  

  

  1.12 
  

  

  18,944 
  

  

  .7, 
  

  

  Date 
  

  

  clusters 
  

  

  were 
  

  

  examined. 
  

  

  Sept. 
  21-24 
  

  

  Do. 
  

   Do. 
  

   Do. 
  

  

  INSI'RAYED. 
  

  

  Va 
  

   Vb 
  

   Va 
  

  

  VI. 
  

  

  Vb 
  

   Va 
  

  

  Vb 
  

  

  lUnsprayed.. 
  . 
  

  

  i....do 
  

  

  L..do 
  

  

  None., 
  

   .do.. 
  

  

  None.. 
  

  

  .do. 
  

  

  lo. 
  

  

  25 
  

  

  1,102 
  

  

  

  1 
  . 
  :,7 
  1 
  

  

  25 
  

  

  994 
  

  

  88 
  

  

  890 
  

  

  25 
  

  

  717 
  

  

  :;s 
  

  

  

  25 
  

  

  1,182 
  

  

  38 
  

  

  1,168 
  

  

  ■ 
  : 
  72 
  

  

  ' 
  1.77 
  

  

  ■ 
  2.60 
  

  

  S«>pt. 
  21 
  24 
  

   Do. 
  

  

  Do. 
  

  

  ho 
  

  

  