﻿28 
  

  

  THE 
  BED 
  SPIDER 
  ON 
  HOPS 
  IN 
  CALIFORNIA. 
  

  

  BANDING 
  WITH 
  TANGLEFOOT. 
  

  

  Banding 
  with 
  tanglefoot 
  has 
  become 
  the 
  chief 
  method 
  of 
  control- 
  

   ling 
  the 
  hop 
  flea-beetle 
  (Psylliodes 
  punctulata 
  Melsh.) 
  in 
  British 
  

   Columbia, 
  and 
  as 
  the 
  mites 
  also 
  work 
  up 
  the 
  vine 
  mainly 
  by 
  crawling 
  

   it 
  was 
  deemed 
  advisable 
  to 
  attempt 
  to 
  check 
  their 
  progress 
  by 
  means 
  

   of 
  the 
  tanglefoot 
  bands. 
  In 
  order 
  to 
  test 
  this 
  method, 
  10 
  infested 
  

  

  hop 
  vines 
  were 
  selected. 
  A 
  few 
  

   leaves 
  were 
  removed 
  to 
  prevent 
  

   bridging, 
  and 
  in 
  some 
  cases 
  the 
  

   vines 
  were 
  stripped; 
  tree 
  tanglefoot 
  

   was 
  then 
  applied 
  to 
  the 
  vines 
  in 
  3- 
  

   inch 
  bands. 
  (See 
  fig. 
  6.) 
  About 
  20 
  

   badly 
  infested 
  leaves 
  were 
  next 
  at- 
  

   tached 
  to 
  the 
  vines 
  below 
  the 
  bands 
  

   and 
  the 
  lower 
  parts 
  thus 
  thoroughly 
  

   infested. 
  During 
  the 
  following 
  week 
  

   these 
  vines 
  were 
  continuously 
  ob- 
  

   served. 
  Hundreds 
  of 
  mites 
  were 
  

   found 
  around 
  the 
  lower 
  edges 
  of 
  the 
  

   bands, 
  and 
  in 
  cases 
  where 
  the 
  lower 
  

   leaves 
  had 
  been 
  stripped 
  off 
  some 
  

   web 
  was 
  found 
  at 
  the 
  base 
  of 
  the 
  

   tanglefoot, 
  but 
  there 
  was 
  no 
  evidence 
  

   that 
  the 
  mites 
  had 
  crossed 
  over. 
  

   Although 
  mites 
  were 
  seen 
  above 
  

   the 
  bands, 
  these 
  probably 
  were 
  car- 
  

   ried 
  there 
  on 
  the 
  observer's 
  hands 
  

   during 
  previous 
  observations. 
  

  

  Similar 
  experiments 
  were 
  con- 
  

   ducted, 
  in 
  1912, 
  except 
  that 
  some 
  

   foliage 
  was 
  left 
  below 
  the 
  bands 
  on 
  

   which 
  the 
  mites 
  could 
  multiply 
  and 
  

   from 
  which 
  they 
  could 
  migrate. 
  

   Three 
  weeks' 
  observation 
  failed 
  to 
  reveal 
  mites 
  above 
  properly 
  banded 
  

   vines, 
  but 
  after 
  this 
  time 
  the 
  tanglefoot 
  became 
  filled 
  with 
  sand 
  and 
  

   was 
  not 
  effective. 
  

  

  One 
  large-scale 
  experiment 
  with 
  tanglefoot 
  was 
  attempted, 
  but 
  

   the 
  work 
  was 
  done 
  so 
  late 
  in 
  the 
  season 
  that 
  a 
  few 
  mites 
  were 
  already 
  

   above 
  the 
  point 
  of 
  banding 
  and 
  no 
  definite 
  results 
  could 
  be 
  obtained. 
  

   Banding 
  with 
  tanglefoot 
  in 
  itself 
  will 
  probably 
  not 
  act 
  as 
  a 
  control 
  

   for 
  the 
  red 
  spider, 
  but 
  in 
  yards 
  where 
  late 
  clean 
  culture 
  is 
  not 
  practi- 
  

   cable 
  it 
  will 
  probably 
  protect 
  the 
  sprayed 
  vines 
  from 
  the 
  late 
  summer 
  

   migrations. 
  

  

  Application. 
  — 
  It 
  is 
  necessary 
  to 
  get 
  the 
  tanglefoot 
  well 
  into 
  the 
  

   spaces 
  between 
  the 
  two 
  vines, 
  the 
  simplest 
  way 
  to 
  accomplish 
  this 
  

  

  Fig. 
  6. 
  — 
  Hopvines 
  banded 
  with 
  tanglefoot, 
  in 
  an 
  

   attempt 
  to 
  prevent 
  the 
  mites 
  from 
  ascending. 
  

   (Original.) 
  

  

  