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  THE 
  RED 
  SPIDER 
  ON 
  HOPS 
  IN 
  CALIFORNIA. 
  

  

  COST 
  OF 
  SPRAYING. 
  

  

  The 
  following 
  estimate 
  of 
  the 
  cost 
  of 
  spraying 
  for 
  the 
  red 
  spider 
  is 
  

   made 
  from 
  data 
  taken 
  from 
  actual 
  field 
  work 
  on 
  high-trellis 
  yards. 
  

   The 
  amount 
  of 
  material 
  needed 
  for 
  hops 
  on 
  short 
  poles 
  will 
  be 
  some- 
  

   what 
  less. 
  

  

  It 
  has 
  been 
  found 
  that 
  one 
  machine 
  will 
  spray 
  from 
  2 
  to 
  3 
  acres 
  

   per 
  day 
  and 
  that 
  in 
  order 
  to 
  do 
  thorough 
  work 
  it 
  is 
  necessary 
  to 
  apply 
  

   from 
  300 
  to 
  500 
  gallons 
  per 
  acre, 
  .according 
  to 
  the 
  amount 
  of 
  foliage 
  

   on 
  the 
  vines. 
  The 
  following 
  data 
  are 
  based 
  on 
  a 
  machine 
  which 
  will 
  

   spray 
  2 
  acres 
  per 
  day. 
  

  

  Table 
  IX. 
  — 
  Cost 
  of 
  spraying 
  hopyards 
  for 
  the 
  red 
  spider. 
  

  

  

  Cost 
  of 
  application 
  per 
  acre. 
  

  

  

  Flour 
  paste, 
  8-100; 
  

   cost 
  and 
  cooking, 
  

   19 
  cents 
  per 
  100 
  

   gallons. 
  

  

  Lime 
  sulphur, 
  1-100, 
  

   and 
  flour 
  paste, 
  

   4-100; 
  cost 
  per 
  100 
  

   gallons, 
  26 
  cents. 
  

  

  

  300 
  

   gallons. 
  

  

  500 
  

   gallons. 
  

  

  300 
  

   gallons. 
  

  

  500 
  

   gallons. 
  

  

  Labor 
  : 
  3 
  men 
  at 
  $2 
  per 
  day 
  for 
  one-half 
  day 
  

  

  $0.57 
  

  

  3.00 
  

  

  .25 
  

  

  $0.95 
  

  

  3.00 
  

  

  .25 
  

  

  $0.78 
  

  

  3.00 
  

  

  .25 
  

  

  $1.30 
  

   3.00 
  

  

  1 
  horse 
  at 
  $0.50 
  per 
  day 
  for 
  one-half 
  day 
  

  

  .25 
  

  

  

  

  

  3.82 
  

  

  4.20 
  

  

  4.03 
  

  

  4.55 
  

  

  

  

  

  7.64 
  

  

  8.40 
  

  

  8.06 
  

  

  9.10 
  

  

  

  

  The 
  cost 
  of 
  stripping 
  the 
  vines 
  preliminary 
  to 
  spraying 
  will 
  be 
  

   from 
  $1.80 
  to 
  $2 
  per 
  acre". 
  

  

  Comparing 
  the 
  cost 
  of 
  spraying 
  for 
  the 
  red 
  spicier 
  with 
  the 
  loss 
  

   that 
  may 
  result 
  from 
  its 
  ravages, 
  it 
  is 
  evident 
  that 
  money 
  spent 
  in 
  

   controlling 
  this 
  mite 
  will 
  be 
  well 
  invested. 
  

  

  CULTURAL 
  METHODS. 
  

  

  Stripping 
  the 
  vines. 
  — 
  The 
  practice 
  of 
  stripping 
  the 
  vines 
  is 
  a 
  common 
  

   one 
  in 
  regions 
  where 
  the 
  hop 
  aphis 
  (Phorodon 
  Jiumuli 
  Schrank) 
  is 
  

   troublesome. 
  A 
  large 
  amount 
  of 
  aphis-breeding 
  foliage 
  is 
  cleared 
  

   from 
  the 
  vines 
  and 
  only 
  the 
  more 
  readily 
  sprayed 
  leaves 
  are 
  left. 
  

  

  In 
  experimenting 
  along 
  this 
  line 
  several 
  vines 
  were 
  stripped 
  and 
  

   tied 
  together 
  at 
  various 
  points 
  to 
  determine 
  which 
  method 
  would 
  

   most 
  readily 
  facilitate 
  spraying. 
  The 
  lower 
  foliage 
  on 
  vines 
  which 
  

   were 
  not 
  stripped 
  but 
  were 
  tied 
  together 
  4 
  feet 
  from 
  the 
  ground 
  

   (fig. 
  7) 
  was 
  found 
  to 
  be 
  matted 
  and 
  very 
  difficult 
  to 
  spray 
  thoroughly. 
  

   When 
  the 
  lower 
  3 
  feet 
  of 
  the 
  vines 
  were 
  stripped 
  and 
  the 
  two 
  vines 
  

   tied 
  at 
  the 
  4-foot 
  mark 
  (fig. 
  8), 
  1 
  foot 
  of 
  the 
  vine 
  was 
  still 
  in 
  a 
  condi- 
  

   tion 
  difficult 
  to 
  spray. 
  But 
  when 
  stripped 
  and 
  tied 
  a 
  few 
  inches 
  

   below 
  the 
  lower 
  leaves 
  (fig. 
  9), 
  the 
  vines 
  spread 
  out 
  nicely 
  and 
  the 
  

  

  