﻿58 
  

  

  DECIDUOUS 
  FKUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  Ta.ble 
  XXIV. 
  — 
  Spray 
  formulas 
  and 
  dates 
  of 
  application 
  against 
  larvae, 
  of 
  the 
  grape-berry 
  

   moth. 
  Vineyard 
  of 
  Mr. 
  W. 
  S. 
  Wheeler, 
  North 
  East, 
  Pa., 
  1908. 
  

  

  Plat 
  

   No. 
  

  

  Spray 
  fornnila. 
  

  

  Number 
  

   of 
  spray 
  

   applica- 
  

   tions. 
  

  

  Date 
  of 
  application. 
  

  

  I 
  

  

  EL... 
  

  

  Three 
  pounds 
  arsenate 
  of 
  lead 
  and 
  2 
  pounds 
  resin-ftsh-oil 
  to 
  50 
  

  

  gallons 
  of 
  Bordeaux 
  mixture. 
  

   do 
  

  

  2 
  

  

  3 
  

   2 
  

  

  1 
  

  

  June 
  4, 
  18. 
  

  

  June 
  4. 
  18; 
  July 
  6. 
  

   June 
  19; 
  July 
  6. 
  

  

  III... 
  

  

  do 
  

  

  IV 
  

  

  do 
  

  

  Va-b 
  

  

  Unsprayed. 
  

  

  

  The 
  same 
  spraying 
  machine 
  and 
  the 
  same 
  nozzle 
  arrangement 
  

   were 
  used 
  as 
  in 
  1907. 
  The 
  pressure 
  maintained 
  was 
  from 
  100 
  to 
  125 
  

   pounds. 
  About 
  100 
  gallons 
  of 
  spray 
  were 
  applied 
  per 
  acre. 
  The 
  

   first 
  application 
  was 
  made 
  June 
  4, 
  just 
  before 
  the 
  blossom 
  buds 
  

   opened. 
  A 
  double 
  application 
  was 
  made 
  at 
  this 
  date; 
  that 
  is, 
  as 
  

   soon 
  as 
  the 
  plats 
  had 
  been 
  sprayed 
  once 
  the 
  same 
  plats 
  were 
  gone 
  

   over 
  again. 
  Only 
  Plats 
  I 
  and 
  II 
  were 
  sprayed 
  at 
  this 
  date. 
  On 
  

   June 
  18, 
  just 
  after 
  blossoming, 
  when 
  the 
  berries 
  were 
  about 
  the 
  size 
  of 
  

   buckshot 
  (PI. 
  VIII, 
  fig. 
  1), 
  all 
  four 
  of 
  the 
  plats 
  were 
  given 
  a 
  double 
  

   spraying. 
  About 
  100 
  gallons 
  of 
  spray 
  were 
  used 
  at 
  each 
  application 
  

   and 
  a 
  pressure 
  of 
  from 
  100 
  to 
  125 
  pounds 
  was 
  maintained. 
  Plat 
  II 
  

   received 
  a 
  third 
  application 
  July 
  6. 
  This 
  also 
  was 
  a 
  double 
  applica- 
  

   tion. 
  In 
  making 
  these 
  double 
  applications 
  the 
  vines 
  were 
  covered 
  

   very 
  thoroughly 
  by 
  the 
  spray. 
  

  

  As 
  in 
  the 
  previous 
  season 
  the 
  infestation 
  proved 
  to 
  be 
  widely 
  vari- 
  

   able, 
  rendering 
  it 
  impossible 
  to 
  make 
  a 
  comparison 
  of 
  the 
  value 
  of 
  the 
  

   variation 
  in 
  the 
  number 
  of 
  applications 
  made 
  to 
  the 
  different 
  plats. 
  

   The 
  infestation 
  was 
  distributed 
  in 
  about 
  the 
  same 
  general 
  manner 
  as 
  

   in 
  the 
  previous 
  year. 
  Plat 
  I, 
  on 
  the 
  south 
  side 
  of 
  the 
  section, 
  was 
  

   the 
  most 
  heavily 
  infested, 
  the 
  infestation 
  gradually 
  decreasing 
  in 
  the 
  

   other 
  plats 
  toward 
  the 
  north 
  side 
  of 
  the 
  vineyard. 
  Counts 
  were 
  

   made 
  on 
  25 
  vines 
  in 
  each 
  of 
  the 
  check 
  plats 
  and 
  also 
  in 
  each 
  of 
  the 
  

   sprayed 
  plats 
  to 
  show 
  the 
  progress 
  of 
  infestation 
  for 
  the 
  first 
  and 
  

   second 
  broods. 
  (See 
  Table 
  XXV, 
  showing 
  count 
  of 
  infested 
  berries 
  

   for 
  1908.) 
  

  

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

   mental 
  plats. 
  Vineyard 
  of 
  Mr. 
  W. 
  S. 
  Wheeler, 
  North 
  East, 
  Pa., 
  1908. 
  

  

  

  FIRST 
  COUNT 
  OF 
  INFESTED 
  BERRIES, 
  MADE 
  

  

  ON 
  AUGUST 
  3, 
  4. 
  

  

  

  IMa! 
  No. 
  

  

  Date 
  of 
  spray 
  application.! 
  Spray 
  formula. 
  

  

  Number 
  

   of 
  appli- 
  

   cations. 
  

  

  Number 
  

   of 
  vines 
  

   exam- 
  

   ined. 
  

  

  Number 
  

   of 
  in- 
  

   fested 
  

  

  berries. 
  

  

  I.. 
  

  

  June 
  4, 
  18 
  j 
  5-5-3-2-50 
  

  

  2 
  

   3 
  

   2 
  

   1 
  

  

  25 
  

   25 
  

   25 
  

   25 
  

  

  28 
  

  

  II 
  . 
  

  

  June 
  4, 
  18; 
  July 
  li 
  5-5-3-2-50 
  

  

  25 
  

  

  Ill 
  

  

  June 
  19; 
  July 
  6. 
  | 
  5-5-3-2-50 
  

  

  21 
  

  

  IV... 
  

  

  June 
  19 
  . 
  5-5-3-2-50 
  

  

  31 
  

  

  

  

  

  

  