﻿641 
  

  

  Koolziekten. 
  [Diseases 
  of 
  Cabbages]. 
  — 
  Inst, 
  voor 
  Phytopath., 
  Wage- 
  

   ningen, 
  Vlugschr. 
  no. 
  10, 
  June 
  1914, 
  4 
  pp., 
  1 
  fig. 
  

  

  The 
  most 
  important 
  pest 
  of 
  cabbages 
  dealt 
  with 
  in 
  this 
  leaflet 
  is 
  

   Chortophila 
  {Anihomyia) 
  brassicae. 
  It 
  appears 
  early 
  in 
  the 
  spring, 
  

   the 
  eggs 
  being 
  laid 
  on 
  the 
  stems 
  of 
  the 
  cabbages 
  close 
  to 
  the 
  surface 
  

   of 
  the 
  soil. 
  The 
  larvae 
  eat 
  their 
  way 
  into 
  the 
  stalks 
  and 
  bore 
  down- 
  

   wards. 
  The 
  flies 
  emerge 
  in 
  June, 
  and 
  in 
  the 
  course 
  of 
  the 
  summer 
  

   there 
  appears 
  to 
  be 
  a 
  third 
  generation 
  which 
  winters 
  as 
  pupae 
  in 
  

   places 
  where 
  cabbages 
  are 
  stored 
  or 
  in 
  the 
  soil 
  itself. 
  The 
  pest 
  

   must 
  be 
  attacked 
  on 
  the 
  young 
  cabbage 
  plants 
  before 
  they 
  are 
  planted 
  

   out, 
  the 
  stems 
  being 
  freed 
  from 
  the 
  eggs 
  and 
  a 
  flat, 
  tarred 
  paper 
  collar 
  

   placed 
  round 
  them, 
  parallel 
  \\^th 
  but 
  not 
  touching^ 
  the 
  soil. 
  

  

  Eenige 
  Rhododendron-vijanden. 
  [Some 
  Rhododendron 
  Pests.] 
  — 
  Inst, 
  

   voor 
  Phytopath., 
  Wageningen, 
  Vlugschr. 
  no. 
  11, 
  June 
  1914, 
  4 
  pp. 
  

  

  The 
  bug, 
  Tingis 
  rhododendri, 
  has 
  probably 
  been 
  imported 
  into 
  

   Holland 
  with 
  rhododendrons 
  from 
  abroad, 
  possibly 
  from 
  Japan, 
  and 
  

   has 
  caused 
  very 
  considerable 
  damage 
  in 
  rhododendron 
  nurseries. 
  

   The 
  eggs 
  are 
  laid 
  on 
  the 
  underside 
  of 
  the 
  leaf, 
  generally 
  along 
  the 
  

   principal 
  veins, 
  and 
  a 
  small 
  swelhng 
  marks 
  the 
  point 
  of 
  deposit 
  of 
  each 
  

   egg. 
  The 
  bugs 
  suck 
  the 
  juices 
  of 
  the 
  leaves 
  and 
  the 
  punctures 
  made 
  

   on 
  the 
  underside 
  of 
  the 
  leaf 
  show 
  themselves 
  on 
  the 
  upper 
  side 
  as 
  a 
  

   fine 
  stipphng. 
  All 
  varieties 
  of 
  rhododendrons 
  are 
  said 
  to 
  be 
  attacked 
  

   and 
  also 
  Andromeda 
  japonica 
  and 
  Kalmia 
  latifolia. 
  Nothing 
  can 
  be 
  

   done 
  against 
  the 
  pest 
  in 
  the 
  winter, 
  as 
  the 
  eggs 
  are 
  then 
  within 
  the 
  

   leaf 
  and 
  cannot 
  be 
  reached. 
  The 
  best 
  plan 
  is 
  to 
  attack 
  the 
  young 
  

   bugs 
  with 
  contact 
  poisons 
  as 
  soon 
  as 
  they 
  emerge. 
  Fish-oil 
  soap 
  

   (J 
  to 
  1 
  lb. 
  in 
  3 
  gals, 
  water) 
  has 
  proved 
  particularly 
  useful. 
  Another 
  

   useful 
  spray 
  is 
  a 
  solution 
  of 
  soap 
  in 
  spirit 
  ; 
  2 
  gallons 
  of 
  soft 
  soap, 
  

   J 
  to 
  1 
  gallon 
  of 
  crude 
  spirit 
  and 
  100 
  gallons 
  of 
  water, 
  with 
  or 
  without 
  

   the 
  addition 
  of 
  tobacco 
  extract. 
  Care 
  should 
  be 
  taken 
  to 
  spray 
  the 
  

   undersides 
  of 
  the 
  leaves 
  thoroughly 
  and 
  the 
  spraying 
  should 
  be 
  repeated 
  

   in 
  a 
  few 
  weeks. 
  

  

  Otiorrhynchus 
  sulcatus 
  attacks 
  both 
  rhododendrons 
  and 
  yew, 
  the 
  

   leaves 
  and 
  buds 
  of 
  which 
  it 
  eats 
  in 
  a 
  characteristic 
  manner. 
  These 
  

   weevils 
  can 
  be 
  caught 
  by 
  laying 
  tufts 
  of 
  wood 
  wool 
  or 
  small 
  pieces 
  of 
  

   board 
  between 
  the 
  plants. 
  These 
  should 
  be 
  examined 
  early 
  in 
  the 
  

   morning 
  and 
  the 
  beetles 
  which 
  have 
  collected 
  in 
  or 
  under 
  them 
  should 
  

   be 
  destroyed. 
  A 
  solution 
  of 
  1 
  ounce 
  of 
  Paris 
  green 
  and 
  2 
  lb. 
  of 
  Hme 
  

   in 
  19 
  gallons 
  of 
  water 
  is 
  useful 
  against 
  this 
  and 
  similar 
  pests. 
  

  

  Eeniger 
  belangrijke 
  rozenvijanden. 
  [Some 
  important 
  pests 
  of 
  roses.] 
  

   — 
  Inst, 
  voor 
  Phytopath., 
  Wageningen, 
  Vlugschr. 
  no. 
  12, 
  June 
  

   1914, 
  6 
  pp. 
  

  

  The 
  sawfly, 
  Eriocampoides 
  aethiops, 
  does 
  great 
  damage 
  in 
  Dutch 
  

   rose 
  gardens. 
  Spraying 
  with 
  a 
  10 
  per 
  cent, 
  solution 
  of 
  Paris 
  green 
  

   or 
  a 
  ^ 
  per 
  cent, 
  solution 
  of 
  lead 
  arsenate 
  is 
  of 
  some 
  value. 
  Dusting 
  

   with 
  American 
  insect 
  powder 
  by 
  means 
  of 
  bellows 
  is 
  also 
  a 
  very 
  

   good 
  method 
  of 
  combating 
  the 
  pest. 
  Tbe 
  same 
  treatment 
  should 
  

   be 
  used 
  against 
  Hylotoma 
  rosae. 
  The 
  eggs 
  of 
  another 
  sawfly, 
  

  

  (C88) 
  B 
  

  

  