﻿SPRAYING 
  AGAINST 
  GRAPE 
  LEAFHOPPER. 
  5 
  

  

  for 
  the 
  past 
  10 
  years, 
  however, 
  have 
  averaged 
  about 
  13 
  cents 
  per 
  

   basket. 
  On 
  this 
  basis 
  the 
  cash 
  increase 
  on 
  the 
  treatment 
  in 
  1910 
  

   was 
  $20.93 
  per 
  acre, 
  and 
  on 
  the 
  treatment 
  for 
  the 
  second 
  season 
  of 
  

   1911 
  the 
  increase 
  was 
  $69.42 
  over 
  that 
  of 
  1909 
  before 
  any 
  spray 
  

   treatment 
  was 
  made 
  against 
  this 
  pest. 
  

  

  The 
  actual 
  cash 
  receipts 
  for 
  the 
  three 
  seasons 
  were 
  as 
  follows: 
  

  

  1909 
  Unsprayed, 
  11 
  cents 
  per 
  basket, 
  262 
  baskets, 
  $28.82 
  per 
  acre. 
  

  

  1910 
  Sprayed, 
  19 
  cents 
  per 
  basket, 
  423 
  baskets, 
  $80.37 
  per 
  acre. 
  

  

  1911 
  Sprayed, 
  10 
  cents 
  per 
  basket, 
  79G 
  baskets, 
  $79.60 
  per 
  acre. 
  

  

  Since 
  the 
  actual 
  prices 
  in 
  1909 
  and 
  1911 
  are 
  almost 
  uniform, 
  the 
  

   increase 
  in 
  cash 
  return 
  as 
  a 
  result 
  of 
  increased 
  yield 
  is 
  readily 
  seen. 
  

   This 
  increased 
  cash 
  return 
  in 
  1911 
  was 
  $50.78 
  per 
  acre. 
  

  

  During 
  these 
  three 
  seasons 
  the 
  general 
  treatment 
  for 
  the 
  vineyard 
  

   has 
  been 
  the 
  same 
  for 
  each 
  season. 
  The 
  soil 
  was 
  cultivated 
  several 
  

   times 
  and 
  420 
  pounds 
  of 
  fertilizer 
  containing 
  5 
  per 
  cent 
  nitrogen, 
  8 
  per 
  

   cent 
  phosphoric 
  acid, 
  and 
  8 
  per 
  cent 
  potash 
  were 
  applied 
  each 
  season. 
  

   A 
  Bordeaux 
  and 
  arsenate 
  of 
  lead 
  spray 
  application, 
  consisting 
  of 
  4 
  

   pounds 
  of 
  copper 
  sulphate, 
  5 
  pounds 
  lime, 
  and 
  3 
  pounds 
  arsenate 
  of 
  

   lead 
  to 
  50 
  gallons 
  of 
  water, 
  was 
  made 
  just 
  after 
  blossoming. 
  A 
  later 
  

   application 
  of 
  1 
  pound 
  of 
  copper 
  sulphate 
  to 
  100 
  gallons 
  of 
  water 
  

   was 
  made 
  for 
  protection 
  against 
  mildew. 
  Thus 
  the 
  general 
  treat- 
  

   ment 
  of 
  the 
  vineyard 
  was 
  good 
  and 
  conducive 
  to 
  the 
  securing 
  of 
  

   maximum 
  results. 
  

  

  The 
  additional 
  cost 
  of 
  material 
  and 
  labor 
  involved 
  in 
  making 
  the 
  

   spray 
  application 
  against 
  the 
  grape 
  leafhopper 
  was 
  as 
  follows: 
  

  

  Cost 
  of 
  team 
  per 
  day 
  j 
  $2. 
  25 
  

  

  Boy 
  to 
  drive 
  1. 
  00 
  

  

  Man 
  to 
  handle 
  nozzle 
  1. 
  75 
  

  

  Tobacco 
  extract 
  No. 
  I 
  (strength 
  3 
  quarts 
  to 
  100 
  gallons 
  of 
  water, 
  applied 
  175 
  

  

  gallons 
  per 
  acre) 
  per 
  gallon. 
  . 
  . 
  85 
  

  

  Cost 
  of 
  material 
  for 
  3 
  acres 
  3. 
  36 
  

  

  Total 
  cost 
  of 
  spraying 
  3 
  acres 
  per 
  day 
  8. 
  36 
  

  

  Total 
  cost 
  of 
  spraying 
  1 
  acre 
  2. 
  79 
  

  

  The 
  power 
  was 
  supplied 
  by 
  a 
  tractor 
  sprayer. 
  

  

  There 
  is 
  no 
  doubt 
  that 
  this 
  tobacco-extract 
  application 
  during 
  the 
  

   past 
  two 
  seasons 
  has 
  effectively 
  controlled 
  the 
  grape 
  leafhopper 
  and 
  

   is 
  largely 
  responsible 
  for 
  the 
  increase 
  in 
  crop 
  yield 
  and 
  for 
  the 
  vig- 
  

   orous 
  growl 
  li 
  of 
  vine 
  in 
  this 
  vineyard. 
  

  

  EXPERIMENT 
  IN 
  VINEYARD 
  OF 
  MR. 
  W. 
  E. 
  GRAY, 
  NORTH 
  EAST, 
  PA. 
  

  

  The 
  vines 
  in 
  the 
  vineyard 
  of 
  Mr. 
  W. 
  E. 
  Gray, 
  North 
  East, 
  Pa*, 
  

   were 
  badly 
  infested 
  by 
  grape 
  leafhoppers. 
  They 
  were 
  five 
  years 
  old 
  

   and 
  were 
  bearing 
  a 
  heavy 
  crop 
  of 
  fruit. 
  No 
  spray 
  treatment 
  was 
  

   given 
  them 
  except 
  with 
  tobacco 
  extract 
  No. 
  I 
  for 
  this 
  pest. 
  About 
  

  

  40814°-Bull. 
  11C, 
  pt. 
  1—12 
  2 
  

  

  