﻿719 
  

  

  DEssiATOv 
  (G.). 
  Posa 
  : 
  Kynbiypa 
  btj 
  rpyHiy 
  m 
  noflij 
  cieKnoMii. 
  

  

  [Rose 
  cultivation 
  in 
  soil 
  and 
  under 
  glass.] 
  — 
  « 
  nporpecCHBHOe 
  

   CaflOBOflCTBO 
  M 
  OropOflHMHeCTBO. 
  [Supplement 
  to 
  Progressive 
  

   Fruit-Growing 
  and 
  Market-Gardening], 
  Petrograd, 
  1914, 
  128 
  pp., 
  

   84 
  figs. 
  

  

  In 
  this 
  book 
  some 
  twenty 
  pages 
  are 
  devoted 
  to 
  the 
  description 
  of 
  

   various 
  insect 
  pests 
  and 
  diseases 
  of 
  roses. 
  Of 
  70 
  species 
  of 
  insects 
  

   injurious 
  to 
  roses, 
  only 
  the 
  principal 
  ones 
  are 
  described, 
  classified 
  

   according 
  to 
  the 
  part 
  of 
  the 
  plant 
  they 
  attack. 
  

  

  The 
  insect 
  most 
  dangerous 
  to 
  the 
  roots 
  is 
  Melolontha 
  melolontha, 
  

   the 
  damage 
  being 
  done 
  by 
  the 
  larvae. 
  The 
  only 
  preventive 
  remedy 
  

   seems 
  to 
  be 
  to 
  make 
  the 
  bottom 
  and 
  sides 
  of 
  rose 
  beds 
  impassable 
  

   for 
  the 
  larvae, 
  fining 
  them 
  with 
  broken 
  glass 
  or 
  gravel. 
  To 
  protect 
  

   the 
  beds 
  from 
  direct 
  oviposition 
  by 
  the 
  females, 
  they 
  must 
  be 
  covered 
  

   with 
  straw 
  during 
  the 
  whole 
  time 
  the 
  pests 
  are 
  on 
  the 
  wing 
  and 
  the 
  

   straw 
  afterwards 
  destroyed. 
  

  

  Of 
  the 
  insects 
  injurious 
  to 
  the 
  stems, 
  Arge 
  (Hylotoma) 
  rosae, 
  L., 
  

   oviposits 
  inside 
  the 
  ends 
  of 
  the 
  young 
  shoots. 
  Usually 
  two 
  genera- 
  

   tions 
  of 
  this 
  sawfly 
  occur 
  in 
  Russia, 
  the 
  first 
  one 
  appearing 
  in 
  May 
  and 
  

   the 
  second 
  in 
  August. 
  The 
  larvae 
  feed 
  on 
  the 
  parenchyma 
  of 
  the 
  

   leaves 
  of 
  roses, 
  and 
  after 
  a 
  few 
  weeks, 
  pass 
  into 
  the 
  earth 
  and 
  pupate. 
  

   The 
  most 
  effective 
  remedy 
  consists 
  in 
  collecting 
  the 
  imagines 
  while 
  

   ovipositing, 
  and 
  against 
  the 
  larvae, 
  spraying 
  with 
  arsenicals 
  is 
  

   recommended. 
  Another 
  species, 
  Arge 
  (Hylotoma) 
  pagana, 
  Panz., 
  

   is 
  less 
  widespread. 
  Aulacaspis 
  (Diaspis) 
  rosae, 
  the 
  larvae 
  of 
  

   which 
  appear 
  in 
  spring, 
  is 
  very 
  injurious. 
  Roses 
  of 
  the 
  

   centifolia 
  variety 
  and 
  those 
  which 
  are 
  fightly 
  pruned, 
  are 
  more 
  

   subject 
  to 
  attack. 
  The 
  remedies 
  consist 
  in 
  cutting 
  away 
  and 
  

   burning 
  the 
  damaged 
  shoots, 
  in 
  cleaning 
  the 
  less 
  affected 
  shoots, 
  

   with 
  a 
  brush 
  or 
  a 
  wooden 
  spatula, 
  and 
  spraying 
  in 
  spring, 
  before 
  

   the 
  scales 
  have 
  hardened, 
  with 
  tobacco 
  extract 
  or 
  kerosene 
  emul- 
  

   sion. 
  Tenthredo 
  bipunctata 
  attacks 
  the 
  tips 
  of 
  young 
  shoots, 
  inside 
  

   which 
  the 
  larvae 
  form 
  a 
  burrow. 
  When 
  mature 
  the 
  larvae 
  leave 
  the 
  

   shoots 
  and 
  pupate 
  in 
  the 
  earth, 
  wintering 
  in 
  the 
  pupal 
  stage 
  and 
  

   producing 
  the 
  imago 
  in 
  the 
  following 
  May. 
  Attacked 
  shoots 
  should 
  

   be 
  cut 
  off 
  and 
  destroyed. 
  Thomasia 
  (Clinodiplosis) 
  oculiperda, 
  

   Rubs., 
  is 
  a 
  dangerous 
  pest 
  in 
  nurseries 
  where 
  the 
  grafting 
  of 
  roses 
  is 
  

   carried 
  on. 
  The 
  fly 
  oviposits 
  in 
  June, 
  at 
  the 
  point 
  of 
  the 
  slit 
  

   between 
  the 
  graft 
  and 
  the 
  edge 
  of 
  the 
  bark 
  of 
  the 
  wild 
  stock, 
  fresh 
  

   grafts, 
  as 
  well 
  as 
  those 
  8-14 
  days 
  old, 
  being 
  attacked, 
  a 
  proper 
  umon 
  

   being 
  prevented 
  by 
  the 
  injuries 
  to 
  the 
  tissue 
  and 
  the 
  excrement 
  of 
  the 
  

   larvae. 
  In 
  from 
  4 
  to 
  6 
  weeks 
  the 
  larvae 
  pupate 
  in 
  the 
  earth 
  

   at 
  a 
  depth 
  of 
  about 
  2 
  inches, 
  and 
  remain 
  in 
  this 
  stage 
  8-10 
  months, 
  

   the 
  imago 
  appearing 
  in 
  the 
  following 
  year. 
  This 
  pest, 
  which 
  is 
  very 
  

   widespread 
  in 
  Germany, 
  is 
  less 
  common 
  in 
  Russia. 
  Grafts 
  on 
  the 
  stem 
  

   suffer 
  more 
  than 
  those 
  on 
  the 
  collar, 
  which 
  if 
  covered 
  with 
  earth 
  are 
  

   effectually 
  protected. 
  The 
  dressing 
  on 
  the 
  graft 
  must 
  be 
  fitted 
  so 
  

   closely 
  that 
  the 
  female 
  will 
  be 
  unable 
  to 
  oviposit 
  thereon, 
  this 
  being 
  

   effected 
  by 
  means 
  of 
  a 
  2 
  inch 
  bandage 
  of 
  cotton 
  thread 
  underneath 
  

   the 
  raffia, 
  or 
  the 
  grafting 
  point 
  may 
  be 
  smeared, 
  over 
  the 
  raffia, 
  with 
  

   garden 
  pitch. 
  Rose 
  bushes 
  attacked 
  by 
  Aphis 
  rosae 
  should 
  be 
  

   sprayed 
  with 
  quassia 
  extract, 
  prepared 
  from 
  chips 
  of 
  Quassia 
  amara, 
  L., 
  

  

  