﻿EXPERIMENTS 
  FOR 
  CONTROL. 
  29 
  

  

  • 
  

  

  being 
  with 
  the 
  hands. 
  A 
  section 
  about 
  3 
  inches 
  long 
  should 
  be 
  

   coated 
  with 
  the 
  tanglefoot, 
  care 
  being 
  taken 
  that 
  no 
  parts 
  are 
  missed 
  

   and 
  that 
  no 
  leaves 
  are 
  left 
  to 
  form 
  a 
  bridge 
  across 
  it. 
  Although 
  the 
  

   tanglefoot 
  is 
  apparently 
  very 
  disagreeable 
  material 
  to 
  apply, 
  it 
  is 
  

   easily 
  washed 
  off 
  the 
  hands 
  with 
  a 
  little 
  kerosene 
  or 
  even 
  with 
  soap 
  

   and 
  hot 
  water. 
  

  

  METHODS 
  OF 
  APPLYING 
  SPRAYS. 
  

  

  No 
  spraying 
  for 
  the 
  red 
  spider 
  should 
  be 
  attempted 
  unless 
  the 
  

   proper 
  appliances 
  and 
  machinery 
  are 
  at 
  hand. 
  Hand 
  pumps 
  which 
  

   will 
  maintain 
  150 
  pounds 
  pressure 
  can 
  be 
  used, 
  but 
  power 
  outfits 
  

   are 
  preferable. 
  Traction 
  and 
  compressed-air 
  sprayers 
  which 
  will 
  

   maintain 
  the 
  proper 
  pressure 
  are 
  light, 
  convenient, 
  and 
  readily 
  hauled 
  

   through 
  the 
  hopyards, 
  but 
  unless 
  the 
  required 
  pressure 
  is 
  maintained 
  

   they 
  will 
  not 
  give 
  satisfactory 
  results 
  in 
  spraying. 
  The 
  outfits 
  used 
  

   in 
  the 
  experimental 
  work 
  at 
  Sacramento 
  were 
  composed 
  of 
  a 
  gaso- 
  

   line 
  engine, 
  a 
  spray 
  pump, 
  and 
  a 
  50-gallon 
  barrel 
  mounted 
  upon 
  a 
  

   light 
  three-wheeled 
  truck. 
  These 
  outfits 
  did 
  effective 
  work, 
  but 
  

   carried 
  so 
  little 
  spray 
  material 
  that 
  they 
  required 
  refilling 
  entirely 
  too 
  

   often. 
  A 
  large 
  orchard 
  power 
  outfit 
  (PI. 
  VI, 
  fig. 
  2) 
  equipped 
  with 
  

   two 
  150-foot 
  lines 
  of 
  hose 
  was 
  operated 
  around 
  the 
  edges 
  of 
  some 
  of 
  

   the 
  yards 
  with 
  good 
  results. 
  The 
  driver 
  assisted 
  the 
  rodmen 
  in 
  get- 
  

   ting 
  the 
  hose 
  in 
  and 
  out 
  of 
  the 
  rows 
  and 
  a 
  wide 
  strip 
  around 
  the 
  yards 
  

   was 
  treated. 
  In 
  cases 
  where 
  the 
  infestation 
  appears 
  on 
  one 
  side 
  of 
  a 
  

   field 
  such 
  machines 
  can 
  be 
  readily 
  employed. 
  

  

  The 
  mites 
  are 
  almost 
  entirely 
  found 
  on 
  the 
  underside 
  of 
  the 
  leaves, 
  

   and 
  in 
  order 
  to 
  wash 
  them 
  thoroughly 
  the 
  spray 
  must 
  be 
  directed 
  

   from 
  below. 
  When 
  angle 
  nozzles 
  are 
  not 
  available 
  the 
  spray 
  rod 
  may 
  

   be 
  bent 
  so 
  that 
  the 
  spray 
  may 
  be 
  readily 
  directed 
  to 
  the 
  underside 
  of 
  

   the 
  leaves. 
  If 
  one 
  or 
  the 
  other 
  of 
  these 
  methods 
  is 
  not 
  employed 
  the 
  

   material 
  will 
  not 
  be 
  satisfactorily 
  applied. 
  

  

  In 
  order 
  to 
  penetrate 
  all 
  of 
  the 
  webs 
  and 
  reach 
  all 
  of 
  the 
  mites 
  it 
  is 
  

   necessary 
  to 
  use 
  a 
  nozzle 
  that 
  will 
  throw 
  a 
  washing 
  rather 
  than 
  a 
  

   mist 
  spray. 
  The 
  Bordeaux 
  or 
  " 
  stopcock" 
  type 
  is 
  usually 
  too 
  coarse 
  

   and 
  wastes 
  material, 
  so 
  that 
  a 
  nozzle 
  should 
  be 
  chosen 
  somewhere 
  

   between 
  that 
  and 
  the 
  Vermorcl 
  type. 
  Some 
  of 
  the 
  recent 
  makes 
  can 
  

   be 
  regulated 
  by 
  the 
  alteration 
  of 
  the 
  size 
  of 
  the 
  opening 
  in 
  the 
  disk 
  

   so 
  that 
  any 
  degree 
  of 
  spray 
  can 
  be 
  obtained. 
  Such 
  nozzles 
  are 
  very 
  

   well 
  adapted 
  to 
  the 
  red-spider 
  work. 
  

  

  In 
  controlling 
  the 
  red 
  spider 
  in 
  the 
  hop 
  fields 
  it 
  is 
  necessary 
  that 
  a 
  

   Large 
  territory 
  be 
  covered 
  in 
  a 
  short 
  time 
  and 
  that 
  the 
  material 
  be 
  

   applied 
  very 
  thoroughly. 
  To 
  do 
  this 
  several 
  outfits 
  arc 
  1 
  necessary 
  

   and 
  these 
  must 
  be 
  in 
  good 
  working 
  condition. 
  Disabled 
  machinery 
  

   not 
  only 
  increases 
  tin 
  4 
  expense 
  of 
  spraying 
  but 
  reduces 
  (he 
  chance 
  of 
  

   controlling 
  the 
  mites. 
  

  

  