﻿381 
  

  

  solution 
  killed 
  many 
  of 
  the 
  thrips, 
  but 
  the 
  tobacco 
  extract 
  waa 
  

   distinctly 
  more 
  effective, 
  destroying 
  practically 
  all 
  the 
  insects. 
  The 
  

   name 
  " 
  Currant 
  Thrips 
  " 
  is 
  proposed 
  for 
  this 
  insect. 
  

  

  Fernald 
  (H. 
  T.) 
  & 
  Bourne 
  (A. 
  I.). 
  Note 
  on 
  the 
  Onion 
  Thrips 
  and 
  

   the 
  Onion 
  Maggot. 
  — 
  Jl. 
  Econ. 
  Entom., 
  Concord, 
  no. 
  2, 
  April 
  1914, 
  

   pp. 
  196-200. 
  

  

  *' 
  Onion 
  Blight 
  " 
  is 
  very 
  common 
  and 
  serious 
  in 
  the 
  onion-growing 
  

   districts 
  of 
  New 
  England. 
  The 
  trouble 
  is 
  caused 
  by 
  Thrips 
  tahaci, 
  

   Lind., 
  which 
  is 
  widely 
  distributed 
  over 
  the 
  country. 
  The 
  insect 
  

   hibernates 
  as 
  an 
  adult 
  in 
  sheltered 
  places, 
  generally 
  in 
  the 
  refuse 
  left 
  

   on 
  the 
  onion 
  field, 
  or 
  at 
  the 
  base 
  of 
  grasses 
  on 
  uncultivated 
  fields 
  and 
  

   along 
  roadsides 
  near 
  the 
  onion 
  fields. 
  The 
  insects 
  pass 
  to 
  the 
  onion 
  

   plants 
  in 
  spring, 
  locating 
  themselves 
  on 
  the 
  leaves 
  to 
  suck 
  the 
  juices. 
  

   Of 
  the 
  control 
  measures 
  attempted, 
  that 
  which 
  was 
  found 
  most 
  satis- 
  

   factory 
  was 
  the 
  careful 
  destruction 
  of 
  all 
  refuse 
  after 
  the 
  crop 
  was 
  

   gathered, 
  and 
  the 
  burning 
  of 
  all 
  strips 
  of 
  grass 
  in 
  and 
  around 
  the 
  fields. 
  

  

  Another 
  pest 
  which 
  has 
  done 
  much 
  injury 
  to 
  the 
  onion 
  crop 
  in 
  

   Massachusetts 
  is 
  the 
  onion 
  maggot. 
  Many 
  treatments 
  for 
  this 
  pest 
  

   have 
  been 
  advocated 
  ; 
  of 
  these, 
  the 
  author 
  selected 
  the 
  eight 
  most 
  

   promising 
  for 
  trial, 
  namely 
  : 
  carbon 
  bisulphide, 
  " 
  nicine," 
  powdered 
  

   hellebore, 
  hellebore 
  decoction, 
  soap 
  wash, 
  carboUc 
  acid 
  and 
  Hme, 
  

   kerosene 
  emulsion, 
  and 
  carbohc 
  acid 
  emulsion. 
  The 
  conclusions 
  

   drawn 
  from 
  these 
  tests 
  were 
  that 
  none 
  of 
  the 
  treatments 
  is 
  entirely 
  

   satisfactory, 
  and 
  that 
  most 
  of 
  them 
  are 
  in 
  any 
  case 
  prohibitive 
  because 
  

   of 
  the 
  expense. 
  CarboUc 
  acid 
  emulsion 
  gave 
  the 
  best 
  results 
  ; 
  its 
  

   cost 
  was 
  from 
  35-50 
  dollars 
  (7L 
  55. 
  \Od.-\Qil. 
  8s. 
  id.) 
  per 
  acre. 
  Dating 
  

   from 
  the 
  past 
  season, 
  experiments 
  are 
  being 
  made 
  at 
  the 
  present 
  

   time 
  to 
  find 
  some 
  less 
  costly 
  method 
  of 
  treatment. 
  

  

  Gibson 
  (A.). 
  A 
  New 
  Destructive 
  Cutworm 
  of 
  the 
  Genus 
  Porosagrotis 
  

   occurring 
  in 
  Western 
  Canada. 
  — 
  Jl. 
  Econ. 
  Entom., 
  Concord, 
  vii, 
  

  

  no. 
  2, 
  April 
  1914, 
  pp. 
  201-203. 
  

  

  f— 
  

  

  The 
  cutworm 
  Porosagrotis 
  delorata, 
  Sm., 
  w^hich 
  until 
  1911 
  was 
  not 
  

   regarded 
  as 
  a 
  pest 
  in 
  Canada, 
  and 
  was 
  indeed 
  extremely 
  rare, 
  has 
  since 
  

   that 
  date 
  been 
  the 
  cause 
  of 
  several 
  cases 
  of 
  severe 
  injury 
  to 
  grain 
  crops. 
  

   In 
  the 
  Lethbridge 
  Land 
  District, 
  it 
  has 
  been 
  estimated 
  that 
  33 
  per 
  cent, 
  

   of 
  the 
  grain 
  sown 
  was 
  ruined, 
  while 
  in 
  the 
  southern 
  part 
  of 
  the 
  Province 
  

   of 
  Alberta 
  30,000 
  to 
  35,000 
  acres 
  of 
  grain 
  have 
  been 
  destroyed. 
  The 
  

   investigation 
  of 
  the 
  hfe-history, 
  habits, 
  methods 
  of 
  control, 
  etc., 
  were 
  

   begun 
  by 
  the 
  author 
  in 
  Alberta 
  in 
  the 
  spring 
  and 
  summer 
  of 
  1913. 
  

   Experiments 
  were 
  made 
  in 
  the 
  fields 
  to 
  test 
  various 
  strengths 
  of 
  Paris 
  

   green, 
  salt, 
  and 
  sugar 
  mixed 
  with 
  moistened 
  bran. 
  The 
  poisoned 
  

   bait 
  was 
  scattered 
  over 
  the 
  fields 
  in 
  the 
  usual 
  way. 
  London 
  purple 
  

   and 
  lead 
  arsenate 
  were 
  also 
  tried. 
  The 
  results 
  were 
  unsatisfactory, 
  

   only 
  about 
  25 
  per 
  cent, 
  of 
  the 
  cutworms 
  being 
  killed. 
  This 
  was 
  

   possibly 
  due 
  to 
  the 
  underground 
  feeding 
  habits 
  of 
  the 
  caterpillars, 
  

   which 
  travel 
  over 
  the 
  surface 
  of 
  the 
  soil 
  until 
  a 
  suitable 
  plant 
  for 
  attack 
  

   is 
  found, 
  and 
  then 
  burrow 
  and 
  feed 
  just 
  below 
  the 
  surface. 
  At 
  Ray- 
  

   mond, 
  26 
  miles 
  from 
  Lethbridge, 
  in 
  large 
  fields 
  of 
  sugar-beet, 
  an 
  

   attack 
  of 
  cutworms 
  was 
  stopped 
  within 
  24 
  hours 
  after 
  the 
  bran 
  was 
  

  

  