﻿25 
  

  

  Columbia 
  it 
  is 
  assisting 
  D. 
  hrevicomis 
  in 
  killing 
  bull-pine. 
  An 
  un- 
  

   described 
  species 
  of 
  Dendroctomts 
  breeds 
  in 
  the 
  fire-injured 
  timber 
  of 
  

   Manitoba, 
  and 
  has 
  killed 
  jack-pine, 
  mostly 
  near 
  the 
  burns. 
  D. 
  simplex 
  

   breeds 
  in 
  dying 
  larch-bark 
  from 
  Manitoba 
  eastward, 
  and 
  apparently 
  

   kills 
  many 
  trees 
  weakened 
  by 
  the 
  larch 
  sawfly. 
  Another 
  undescribed 
  

   Dendroctonus, 
  assisted 
  by 
  species 
  of 
  the 
  genus 
  Ijps 
  (Tomicus), 
  is 
  

   apparently 
  killing 
  much 
  white 
  spruce 
  along 
  the 
  Athabaska 
  river. 
  

   D. 
  pseudotsugae, 
  Hopk., 
  everywhere 
  kills 
  injured 
  and 
  weakened 
  trees, 
  

   and 
  frequently 
  much 
  green 
  timber. 
  D. 
  monticoJae, 
  Hopk., 
  has 
  killed 
  

   many 
  western 
  white 
  pines 
  (Pmus 
  monticola) 
  in 
  the 
  Sugar 
  Lake 
  region 
  

   of 
  British 
  Columbia, 
  and 
  the 
  outbreak 
  is 
  still 
  spreading. 
  It 
  also 
  kills 
  

   the 
  black 
  pine 
  there. 
  D. 
  engelmanni, 
  D. 
  borealis, 
  D. 
  murraijanae, 
  and 
  

   D. 
  obesies 
  are 
  variably 
  destructive 
  to 
  spruce 
  and 
  pine 
  in 
  the 
  Province. 
  

   Many 
  species 
  of 
  genus 
  Ips 
  {Tomicus) 
  are 
  abundant 
  in 
  dying 
  bark 
  of 
  

   pine, 
  spruce, 
  and 
  larch. 
  They 
  are 
  mostly 
  secondary 
  enemies, 
  seldom 
  

   attacking 
  green 
  timber. 
  Some 
  species, 
  however, 
  are 
  injurious 
  to 
  pine 
  

   and 
  spruce 
  in 
  British 
  Columbia 
  and 
  Alberta, 
  and 
  IpsbcJsameus,Jjec., 
  

   is 
  a 
  serious 
  enemy 
  to 
  balsam 
  fir 
  throughout 
  Ontario, 
  Quebec, 
  and 
  

   New 
  Brunswick, 
  also 
  injuring 
  larch 
  to 
  a 
  lesser 
  degree. 
  Polygraphiis 
  

   nifipennis, 
  Kirby, 
  and 
  allied 
  undescribed 
  forms 
  are 
  everywhere 
  im- 
  

   portant 
  secondary 
  enemies 
  to 
  pine, 
  spruce, 
  and 
  larch. 
  Several 
  species 
  

   of 
  Phloeosinus 
  are 
  locally 
  injurious 
  to 
  cedars. 
  Certain 
  twig-beetles 
  of 
  

   the 
  genus 
  Pityophthorus 
  at 
  times 
  become 
  sufficiently 
  numerous 
  to 
  

   check 
  and, 
  rarely, 
  kill 
  the 
  infested 
  trees. 
  Such 
  injury 
  was 
  abundant 
  

   on 
  jack-pine 
  in 
  northern 
  Ontario, 
  and 
  bull-pine 
  in 
  British 
  Columbia. 
  

   Belonging 
  to 
  this 
  group 
  are 
  the 
  peach-tree 
  bark-beetle 
  (Phloeotribus 
  

   liminaris) 
  and 
  the 
  fruit-tree 
  bark-beetle 
  (Eccoptogaster 
  nigulosus) 
  

   which 
  are 
  important 
  pests 
  in 
  southern 
  Ontario, 
  and 
  the 
  former 
  breeds 
  

   also 
  in 
  the 
  wild 
  cherry 
  in 
  Quebec 
  Province. 
  The 
  clover 
  bark-beetle 
  

   {Hylastinus 
  obscunts. 
  Marsh.) 
  is 
  injurious 
  to 
  red 
  mammoth, 
  alsike 
  

   and 
  crimson 
  clovers 
  in 
  parts 
  of 
  Quebec 
  and 
  Ontario. 
  The 
  deciduous 
  

   trees 
  of 
  Canadian 
  forests 
  suffer 
  less 
  from 
  this 
  family. 
  Ambrosia- 
  

   beetles, 
  do 
  not, 
  as 
  a 
  rule, 
  attack 
  sound 
  timber 
  ; 
  in 
  British 
  Columbia 
  

   their 
  injury 
  is 
  only 
  noticed 
  in 
  felled 
  timber 
  left 
  out 
  of 
  water, 
  or 
  in 
  fire- 
  

   injured 
  trees. 
  

  

  F. 
  Die 
  Bekampfung 
  des 
  Heu- 
  und 
  Sauerwurms 
  mit 
  Nikotin 
  

   wahrend 
  des 
  Jahres 
  1913. 
  [The 
  use 
  of 
  nicotin 
  against 
  the 
  vine 
  

   moth 
  in 
  191^.]- 
  -Luxemburger 
  Weinzeitung, 
  Grevenmacher, 
  i, 
  

   no. 
  29, 
  1st 
  Nov. 
  1913, 
  pp. 
  499-506. 
  

  

  ^B 
  jelly 
  and 
  \\ 
  parts 
  of 
  Evert's 
  tobacco 
  extract 
  (10%) 
  per 
  100 
  parts 
  spray. 
  

  

  ^^ 
  Eight 
  reports 
  were 
  dealt 
  with. 
  Three 
  stated 
  there 
  was 
  no 
  foreign 
  

   taste 
  in 
  the 
  must, 
  two 
  reported 
  a 
  bad 
  taste, 
  and 
  the 
  remaining 
  three 
  

   a 
  very 
  bad 
  one. 
  Too 
  strong 
  a 
  percentage 
  of 
  nicotin 
  (4%), 
  and 
  in 
  one 
  

   €ase 
  the 
  admixture 
  of 
  casein, 
  are 
  supposed 
  to 
  account 
  for 
  this. 
  Several 
  

   experimenters 
  suggested 
  that 
  the 
  copper 
  was 
  the 
  cause 
  and 
  not 
  the 
  

   nicotin. 
  Particular 
  stress 
  is 
  laid 
  on 
  the 
  fact 
  that 
  the 
  successful 
  use 
  of 
  

   poisons 
  can 
  only 
  be 
  expected 
  when 
  the 
  vineyard 
  is 
  at 
  the 
  same 
  time 
  

   efficiently 
  protected 
  against 
  Oidium 
  and 
  Peronospora. 
  Nicotin 
  is 
  most 
  

   advantageously 
  employed 
  when 
  the 
  flight 
  of 
  the 
  moths 
  is 
  at 
  its 
  height. 
  

  

  