﻿32 
  

  

  THE 
  KED 
  SPIDER 
  ON 
  HOPS 
  IN 
  CALIFORNIA. 
  

  

  successfully 
  control 
  the 
  mites. 
  Too 
  much 
  faith 
  should 
  not 
  be 
  placed 
  

   in 
  this 
  operation, 
  however, 
  as 
  spraying 
  may 
  have 
  to 
  be 
  resorted 
  to 
  

   as 
  a 
  final 
  measure. 
  The 
  cost 
  of 
  stripping 
  is 
  about 
  $2 
  per 
  acre 
  and 
  

   is 
  more 
  than 
  offset 
  by 
  the 
  results 
  obtained. 
  

  

  Irrigation. 
  — 
  Vines 
  which 
  have 
  not 
  a 
  large 
  supply 
  of 
  moisture 
  dry 
  

   and 
  change 
  color 
  more 
  rapidly 
  than 
  those 
  growing 
  in 
  moister 
  soil, 
  

   so 
  that 
  the 
  work 
  of 
  the 
  red 
  spider 
  is 
  most 
  noticeable 
  on 
  light 
  soil 
  in 
  

  

  Fig. 
  

  

  -Hopvine 
  tied 
  high 
  and 
  stripped; 
  lower 
  leaves 
  matted 
  and 
  difficult 
  to 
  spray. 
  (Original.) 
  

  

  the 
  drier 
  parts 
  of 
  the 
  hopyards. 
  Several 
  growers, 
  believing 
  that 
  

   irrigation 
  of 
  the 
  infested 
  vines 
  would 
  counteract 
  the 
  effect 
  of 
  the 
  

   mites, 
  pumped 
  water 
  onto 
  their 
  yards 
  and 
  gave 
  the 
  soil 
  a 
  thorough 
  

   wetting. 
  The 
  vines 
  responded 
  and 
  put 
  out 
  a 
  few 
  fresh 
  leaves, 
  but 
  

   the 
  mites 
  infested 
  these 
  in 
  the 
  same 
  manner 
  as 
  before 
  and 
  reduced 
  the 
  

   quality 
  of 
  the 
  hops 
  in 
  the 
  same 
  proportion 
  as 
  on 
  unirrigated 
  and 
  

   equally 
  infested 
  parts 
  of 
  the 
  adjoining 
  hopyards. 
  Irrigation 
  will 
  not 
  

   control 
  the 
  mites, 
  but 
  when 
  the 
  soil 
  lacks 
  sufficient 
  moisture 
  it 
  will 
  

  

  