﻿236 
  

  

  July 
  and 
  September 
  is 
  probably 
  an 
  important 
  check 
  to 
  this 
  pest, 
  

   which 
  is 
  httle 
  attacked 
  by 
  parasites. 
  Most 
  damage 
  seems 
  to 
  be 
  done 
  

   on 
  irrigated 
  crops 
  in 
  November. 
  Much 
  injury 
  may 
  be 
  avoided 
  by 
  

   spraying 
  or 
  dusting 
  plants 
  of 
  the 
  cabbage 
  family 
  as 
  a 
  preventive 
  

   measure. 
  Any 
  arsenical 
  preparation 
  may 
  be 
  used, 
  such 
  as 
  arsenite 
  

   of 
  lime, 
  arsenate 
  of 
  lead 
  or 
  Paris 
  green, 
  and 
  spraying 
  should 
  be 
  com- 
  

   menced 
  while 
  the 
  plants 
  are 
  in 
  the 
  seed 
  bed. 
  For 
  use, 
  3 
  lb. 
  of 
  arsenate 
  

   of 
  lead 
  is 
  added 
  to 
  50 
  gallons 
  of 
  water 
  ; 
  for 
  Paris 
  green, 
  1 
  lb. 
  green 
  and 
  

   2 
  lb. 
  fresh 
  lime 
  (quick 
  or 
  water-slaked) 
  is 
  mixed 
  with 
  160 
  gallons 
  of 
  

   water. 
  In 
  preparing 
  arsenite 
  of 
  lime 
  J 
  lb. 
  of 
  arsenite 
  of 
  soda 
  is 
  dis- 
  

   solved 
  in 
  a 
  little 
  hot 
  water 
  and 
  made 
  up 
  to 
  25 
  gallons 
  ; 
  2 
  lb. 
  of 
  fresh 
  

   lime 
  after 
  slaking 
  should 
  be 
  mixed 
  with 
  25 
  gallons 
  of 
  water 
  ; 
  the 
  two 
  

   preparations 
  can 
  then 
  be 
  mixed. 
  For 
  dusting, 
  use 
  Paris 
  green 
  1 
  lb., 
  

   flour 
  or 
  lime 
  20 
  lb., 
  thoroughly 
  mixed 
  together. 
  For 
  plants 
  with 
  

   smooth 
  leaves 
  a 
  sticky 
  substance 
  should 
  be 
  added, 
  such 
  as 
  a 
  mixture 
  

   of 
  resin. 
  This 
  is 
  made 
  by 
  boiling 
  together 
  4 
  lb. 
  resin, 
  2 
  lb. 
  carbonate 
  

   of 
  soda 
  crystals 
  and 
  1 
  gallon 
  of 
  water. 
  This 
  quantity 
  may 
  be 
  mixed 
  

   with 
  50 
  gallons 
  of 
  spraying 
  liquid 
  and 
  is 
  most 
  effective 
  in 
  connection 
  

   with 
  preparations 
  containing 
  lime. 
  All 
  plants 
  should 
  be 
  destroyed 
  

   as 
  soon 
  as 
  their 
  period 
  of 
  usefulness 
  is 
  past, 
  since 
  such 
  plants, 
  cabbage 
  

   stumps, 
  etc., 
  serve 
  as 
  breeding 
  grounds 
  for 
  insect 
  pests 
  such 
  as 
  web- 
  

   worms, 
  turnip 
  sawfly 
  {Athalia 
  rosae), 
  Bagrada 
  bug 
  (Bagrada 
  hilaris), 
  

   diamond-back 
  moth 
  (Plutella 
  sp.), 
  and 
  cabbage 
  aphis 
  (Aphis 
  brassicae)^ 
  

   all 
  of 
  which 
  occur 
  in 
  Southern 
  Rhodesia. 
  

  

  VuiLLET 
  (A.). 
  Tableaux 
  Illustr6s. 
  [Illustrated 
  Identification 
  Tables.] 
  

   — 
  Rev. 
  Phytopath. 
  App., 
  Paris, 
  i, 
  nos. 
  9-12, 
  5th 
  Oct.-20th 
  Nov. 
  

   1913, 
  pp. 
  119-123, 
  138-140, 
  152-157, 
  figs. 
  15. 
  [Received 
  

   30th 
  March 
  1914.] 
  

  

  These 
  tables 
  are 
  intended 
  to 
  facilitate 
  the 
  identification 
  of 
  insect 
  

   pests 
  of 
  cultivated 
  plants 
  in 
  France 
  and 
  the 
  neighbouring 
  countries. 
  

  

  Gaumont 
  (L.). 
  Contribution 
  a 
  I'Etude 
  de 
  la 
  Biologie 
  du 
  Puceron 
  Noir 
  

   de 
  la 
  Betterave. 
  [Contribution 
  to 
  the 
  Study 
  of 
  the 
  Biology 
  of 
  

   the 
  Black 
  Aphis 
  of 
  the 
  Beetroot.]— 
  J?ei'. 
  Phytopath. 
  Ajyp-, 
  Paris 
  ^ 
  

   i, 
  nos. 
  16 
  and 
  17, 
  20th 
  Jan. 
  and 
  5th 
  Feb. 
  1914, 
  pp. 
  4-5. 
  

  

  The 
  black 
  aphis 
  of 
  the 
  beetroot 
  (Aphis 
  euonymi) 
  every 
  year 
  causes 
  

   considerable 
  damage 
  to 
  the 
  crops 
  in 
  north 
  and 
  central 
  France. 
  The 
  

   insects 
  appear 
  at 
  the 
  beginning 
  of 
  June 
  on 
  the 
  young 
  sugar 
  and 
  fodder 
  

   beetroots, 
  as 
  well 
  as 
  on 
  those 
  left 
  for 
  seed. 
  They 
  multiply 
  abundantly 
  

   during 
  summer, 
  so 
  that 
  the 
  lower 
  leaves 
  of 
  the 
  plants 
  become 
  yellow 
  

   and 
  shrivel 
  up 
  and 
  the 
  inflorescences 
  remain 
  small. 
  The 
  same 
  

   injuries 
  have 
  been 
  noticed 
  by 
  Jablonovsky 
  in 
  Hungary 
  and 
  by 
  Mord- 
  

   wilko 
  in 
  Russia. 
  According 
  to 
  Mordwilko, 
  the 
  insects 
  pass 
  the 
  winter 
  

   in 
  the 
  egg 
  stage 
  on 
  the 
  European 
  spindlewood 
  (Euonymus 
  europaeus, 
  

   L.) 
  and 
  alburnum 
  (Viburnum 
  opulus, 
  L.) 
  From 
  this 
  it 
  would 
  follow 
  

   that 
  destruction 
  of 
  these 
  shrubs 
  would 
  be 
  of 
  great 
  value 
  to 
  agriculture. 
  

   The 
  author, 
  however, 
  has 
  found 
  A. 
  euonymi 
  also 
  on 
  Japanese 
  spindle- 
  

   woods, 
  which 
  are 
  very 
  numerous 
  in 
  parks 
  and 
  public 
  gardens 
  ; 
  but 
  

   even 
  if 
  all 
  these 
  shrubs 
  were 
  destroyed 
  the 
  aphis 
  would 
  still 
  exist. 
  

   The 
  author 
  observed 
  at 
  the 
  end 
  of 
  October 
  a 
  field 
  of 
  beetroots 
  in 
  which 
  

  

  