﻿8 
  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  acre 
  was 
  sprayed. 
  The 
  work 
  was 
  done 
  with 
  a 
  tractor 
  vineyard 
  

   sprayer. 
  This 
  machine 
  had 
  been 
  in 
  use 
  several 
  seasons 
  and 
  was 
  not 
  

   working 
  at 
  its 
  best. 
  The 
  spray 
  was 
  applied 
  by 
  the 
  "trailer" 
  method. 
  

   Owing 
  to 
  the 
  poor 
  working 
  of 
  the 
  pump 
  a 
  high 
  pressure 
  was 
  not 
  

   maintained. 
  The 
  pressure 
  varied 
  anywhere 
  from 
  150 
  pounds 
  to 
  50 
  

   pounds. 
  Most 
  of 
  the 
  time 
  it 
  ran 
  below 
  80 
  pounds. 
  For 
  this 
  reason 
  

   it 
  was 
  thought 
  necessary 
  by 
  Mr. 
  Bostwick 
  to 
  make 
  the 
  application 
  on 
  

   both 
  sides 
  of 
  the 
  trellis. 
  In 
  spite 
  of 
  these 
  drawbacks 
  good 
  results 
  

   were 
  secured. 
  About 
  275 
  gallons 
  of 
  liquid 
  were 
  applied 
  per 
  acre. 
  

   This 
  is 
  more 
  liquid 
  than 
  would 
  have 
  been 
  applied 
  by 
  this 
  machine 
  

   had 
  it 
  been 
  in 
  good 
  working 
  condition 
  and, 
  in 
  addition, 
  more 
  time 
  

   was 
  consumed 
  in 
  making 
  the 
  application 
  on 
  both 
  sides 
  of 
  the 
  row. 
  

   About 
  600 
  gallons 
  of 
  spray 
  were 
  applied 
  per 
  day 
  covering 
  about 
  2| 
  

   acres. 
  Tobacco 
  extract 
  No. 
  II 
  was 
  used 
  at 
  a 
  dilution 
  of 
  1 
  to 
  1,300 
  

   parts 
  of 
  water. 
  

  

  Labor 
  cost 
  of 
  application 
  per 
  acre 
  $2. 
  75 
  

  

  Tobacco 
  extract 
  No. 
  II— 
  1 
  to 
  1, 
  300 
  parts 
  water, 
  per 
  acre 
  2. 
  58 
  

  

  Total 
  cost 
  of 
  labor 
  and 
  material 
  per 
  acre 
  5. 
  33 
  

  

  The 
  net 
  yield 
  of 
  grapes 
  from 
  the 
  three 
  plats 
  was 
  as 
  follows 
  : 
  

  

  One 
  acre 
  of 
  vines 
  east 
  of 
  unsprayed 
  plat 
  8,462 
  pounds 
  grapes 
  

  

  One 
  acre 
  of 
  vines 
  west 
  of 
  unsprayed 
  plat 
  8,327 
  pounds 
  grapes 
  

  

  One 
  acre 
  of 
  vines, 
  unsprayed 
  plat 
  7,153 
  pounds 
  grapes 
  

  

  The 
  cash 
  value 
  of 
  the 
  fruit 
  was 
  $25 
  per 
  ton, 
  or 
  $0.0125 
  per 
  pound. 
  

  

  Cash 
  value 
  of 
  yield 
  on 
  1 
  acre 
  east 
  of 
  check 
  $105. 
  77 
  

  

  Cash 
  value 
  of 
  yield 
  on 
  1 
  acre 
  west 
  of 
  check 
  104. 
  09 
  

  

  Cash 
  value 
  of 
  yield 
  on 
  1 
  acre 
  unsprayed 
  1 
  89. 
  41 
  

  

  Increased 
  yield 
  on 
  west 
  plat 
  per 
  acre 
  over 
  check 
  was 
  1,309 
  pounds, 
  or 
  16. 
  36 
  

  

  Increased 
  yield 
  on 
  west 
  plat 
  per 
  acre 
  over 
  check 
  was 
  1,174 
  pounds, 
  or 
  14. 
  67 
  

  

  Net 
  cash 
  gain 
  on 
  sprayed 
  plats 
  after 
  deducting 
  cost 
  of 
  labor 
  and 
  

   material 
  : 
  

  

  Gross 
  gain 
  on 
  plat 
  west 
  of 
  check 
  per 
  acre 
  $16. 
  36 
  

  

  Total 
  cost 
  of 
  labor 
  and 
  material 
  per 
  acre 
  5. 
  33 
  

  

  Net 
  gain 
  resulting 
  from 
  spraying 
  per 
  acre 
  11. 
  03 
  

  

  Gross 
  gain 
  on 
  plat 
  east 
  of 
  check 
  per 
  acre 
  14.67 
  

  

  Total 
  cost 
  of 
  labor 
  and 
  material 
  per 
  acre 
  5. 
  33 
  

  

  Net 
  cash 
  gain 
  resulting 
  from 
  spraying 
  per 
  acre 
  9. 
  34 
  

  

  In 
  addition 
  to 
  this 
  increase 
  in 
  weight 
  of 
  fruit 
  yield 
  it 
  was 
  observed 
  

   that 
  the 
  berries 
  of 
  the 
  grapes 
  were 
  much 
  larger 
  and 
  of 
  better 
  color 
  

   than 
  was 
  the 
  fruit 
  on 
  the 
  unsprayed 
  vines. 
  It 
  was 
  also 
  observed 
  that 
  

   the 
  fruit 
  from 
  the 
  sprayed 
  vines 
  gave 
  a 
  greater 
  weight 
  per 
  basket. 
  

  

  507 
  baskets 
  from 
  the 
  west 
  plat 
  averaged 
  20.7 
  pounds 
  per 
  basket. 
  

   497 
  baskets 
  from 
  the 
  east 
  plat 
  averaged 
  20.7 
  pounds 
  per 
  basket. 
  

   478 
  baskets 
  from 
  the 
  unsprayed 
  plat 
  averaged 
  19 
  pounds 
  per 
  basket. 
  

  

  