﻿79 
  

  

  the 
  drier 
  cotton 
  sections 
  of 
  western 
  and 
  north-western 
  Texas, 
  although 
  

   it 
  is 
  probable 
  that 
  it 
  will 
  gradually 
  adapt 
  itself 
  to 
  the 
  more 
  rigid 
  con- 
  

   ditions 
  obtaining 
  there. 
  It 
  is 
  of 
  extreme 
  importance 
  that 
  the 
  Arizona 
  

   weevil 
  be 
  kept 
  out 
  of 
  western 
  Texas 
  and 
  any 
  part 
  of 
  the 
  south-east. 
  

   If 
  accidentally 
  introduced 
  into 
  other 
  sections, 
  there 
  is 
  reason 
  to 
  believe 
  

   that 
  it 
  might 
  be 
  able 
  to 
  stand 
  much 
  greater 
  variations 
  of 
  climate 
  

   than 
  Anthonomiis 
  grandis, 
  and 
  become 
  a 
  much 
  more 
  serious 
  pest. 
  

  

  DoBRovLiANSKY 
  (V. 
  V.). 
  K"b 
  OioHoriM 
  TJieii 
  nnoAOBbixij 
  AepeBbeei* 
  

   H 
  nrOflHblX'b 
  KyCTOBTa. 
  [On 
  the 
  Biology 
  of 
  Aphis 
  pests 
  of 
  tree 
  

   and 
  bush 
  Fruit.] 
  KieecKafl 
  SHTOMOJiornMecKan 
  CiaHuin 
  npw 
  

   KDwHO-PyccKOM-b 
  06LuecTBt 
  riooLUpeHifl 
  SeiyiJieAt/iifi 
  m 
  Ce/ibCKOH 
  

   ripOMbimneHHOCTM. 
  — 
  [Pubd. 
  by 
  the 
  Kiev 
  Entomological 
  Station 
  of 
  

   the 
  South-Russian 
  Agricultural 
  Syndicate], 
  Kiev, 
  1913, 
  48 
  pp. 
  

  

  This 
  memoir 
  is 
  the 
  result 
  of 
  observations 
  on 
  aphids 
  collected 
  by 
  the 
  

   author 
  during 
  the 
  summer 
  of 
  1912 
  around 
  Kiev 
  ; 
  his 
  primary 
  object 
  

   being 
  the 
  study 
  of 
  the 
  life-history 
  of 
  Aphis 
  2Jomi, 
  de 
  G. 
  He 
  first 
  gives 
  

   the 
  following 
  list 
  of 
  aphids 
  found 
  on 
  certain 
  fruit 
  trees, 
  but 
  does 
  not 
  

   •claim 
  that 
  it 
  is 
  exhaustive. 
  On 
  fruit 
  trees 
  of 
  the 
  genus 
  Pirus 
  : 
  — 
  

   Myziis 
  mali, 
  Ferr., 
  M. 
  pyrinus, 
  Fen., 
  M. 
  jyyyciritis, 
  Pass., 
  Aphis 
  pomi, 
  

   de 
  G., 
  A. 
  fitchi, 
  Sand., 
  A. 
  sorbi, 
  Kit., 
  A. 
  crataegi, 
  Kit., 
  A, 
  pyri, 
  Koch, 
  

   Schizoneura 
  lanigera, 
  Hausm., 
  S. 
  jyyri, 
  Goethe, 
  Rhizoctonus 
  ampelinus, 
  

   Horv., 
  Phylloxera 
  piri, 
  Mokr. 
  On 
  fruit 
  trees 
  of 
  the 
  genus 
  Prunus 
  : 
  — 
  

   Phorodon 
  humuli, 
  Schr., 
  Rhopalosijjhum 
  persicae, 
  Sulz., 
  Myzus 
  cerasi, 
  

   F., 
  Hyalopterus 
  pruni, 
  F., 
  Aphis 
  prunorum, 
  sp. 
  n., 
  A. 
  pninina, 
  Walk., 
  

   A. 
  cerasina, 
  Walk., 
  A. 
  persicae, 
  Kit., 
  A. 
  pruni, 
  Koch, 
  A. 
  prunicola, 
  

   Kit., 
  Lachnus 
  persicae, 
  Choi. 
  On 
  bush 
  fruit 
  of 
  the 
  genus 
  Ribes 
  : 
  — 
  

   Rhopahsiphuni 
  ribis, 
  L., 
  Myzus 
  ribicolus. 
  Kit., 
  M. 
  ribis, 
  L., 
  Aphis 
  

   ^rossulariae. 
  Kit., 
  Schizoneura 
  ulmi, 
  L., 
  (fodiens, 
  Buckt.), 
  S. 
  grossu- 
  

   lariae, 
  Schule. 
  On 
  bush 
  fruit 
  of 
  the 
  genus 
  Rubus 
  :^Macrosiphum 
  

   rubi, 
  Kit., 
  Aphis 
  idaei, 
  Goot., 
  A. 
  urticaria, 
  Kit., 
  A. 
  mordivilkiana, 
  sp. 
  n. 
  

  

  Aphis 
  jmmi. 
  The 
  author 
  found 
  these 
  aphids 
  mostly 
  on 
  apple 
  and 
  

   pear 
  trees 
  ; 
  also 
  on 
  white 
  thorn, 
  Cydonia 
  vulgaris, 
  Pers., 
  (quince), 
  

   Mespilus 
  germanica, 
  L. 
  (common 
  medlar), 
  and 
  on 
  Cotoneaster 
  vulgaris 
  

   Lindl. 
  (medlar 
  var.) 
  On 
  apple 
  and 
  pear 
  trees 
  they 
  first 
  suck 
  the 
  buds, 
  

   then 
  the 
  lower 
  sides 
  of 
  young 
  leaves 
  and 
  shoots 
  ; 
  from 
  June 
  onwards 
  

   they 
  are 
  found 
  mostly 
  on 
  the 
  lower 
  sides 
  of 
  leaves 
  of 
  apple, 
  while 
  on 
  

   pear 
  trees 
  they 
  are 
  found 
  less 
  frequently 
  ; 
  in 
  the 
  autumn 
  they 
  were 
  

   found 
  only 
  on 
  the 
  leaves 
  of 
  apple. 
  The 
  development 
  of 
  the 
  larvae, 
  

   from 
  birth 
  till 
  after 
  the 
  last 
  moult, 
  occupied 
  2 
  weeks 
  in 
  April, 
  while 
  

   in 
  May 
  and 
  in 
  June 
  it 
  was 
  only 
  10 
  days. 
  The 
  number 
  of 
  larvae 
  pro- 
  

   duced 
  by 
  each 
  parthenogenetic 
  female 
  was 
  25-30, 
  in 
  the 
  case 
  of 
  wing- 
  

   less 
  specimens, 
  and 
  20-25 
  in 
  the 
  case 
  of 
  winged 
  ones. 
  Amongst 
  

   their 
  natural 
  enemies 
  the 
  author 
  records, 
  Exochomus 
  quadripustulatus 
  

   in 
  April, 
  while 
  in 
  June 
  larvae 
  of 
  another 
  ladybird 
  were 
  found, 
  as 
  well 
  

   as 
  those 
  of 
  Syrphid 
  flies 
  ; 
  in 
  July 
  and 
  August 
  the 
  larvae 
  were 
  destroyed 
  

   by 
  the 
  larvae 
  of 
  Bremia, 
  as 
  well 
  as 
  by 
  Coccinella 
  li-punctata, 
  L., 
  in 
  

   August. 
  Some 
  specimens 
  were 
  infected 
  by 
  a 
  parasite, 
  and 
  the 
  author 
  

   reared 
  some 
  secondary 
  parasites 
  : 
  Pachyneuron 
  ap)hidis, 
  Bouche, 
  

   Encyrtus 
  aphidivorus, 
  Mayr, 
  and 
  Lygocerus 
  sp. 
  The 
  author 
  is 
  satisfied 
  

   (1) 
  that 
  there 
  is 
  no 
  total 
  disappearance 
  of 
  these 
  aphids 
  from 
  apple 
  trees 
  

   during 
  the 
  summer, 
  but 
  that 
  they 
  pass 
  their 
  whole 
  Ufe-cycle 
  on 
  them 
  ; 
  

  

  