﻿334 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  United 
  States. 
  It 
  is 
  known 
  to 
  be 
  present 
  in 
  a 
  number 
  of 
  widely 
  sepa- 
  

   rated 
  localities 
  in 
  New 
  York 
  state, 
  and 
  it 
  will 
  probably 
  be 
  found 
  in 
  

   greater 
  or 
  less 
  numbers 
  wherever 
  greenhouse 
  plants 
  have 
  been 
  grown 
  for 
  

   ■some 
  years. 
  

  

  Food 
  plants. 
  This 
  pest 
  is 
  able 
  to 
  subsist 
  on 
  a 
  number 
  of 
  different 
  

   plants. 
  Prof. 
  Comstock 
  has 
  studied 
  it 
  on 
  acacia, 
  magnolia, 
  oleander, 
  

   maple, 
  yucca, 
  plum, 
  cherry, 
  currant 
  and 
  the 
  china-tree, 
  M 
  e 
  1 
  i 
  a 
  a 
  z 
  e 
  d 
  - 
  

   arach, 
  in 
  California 
  and 
  on 
  ivy 
  at 
  Ithaca 
  (N. 
  Y.) 
  He 
  also 
  found 
  it 
  

   on 
  grass 
  and 
  clover 
  growing 
  in 
  pots 
  with 
  infested 
  trees 
  and 
  on 
  lemons 
  

   from 
  the 
  Mediterranean 
  and 
  from 
  California, 
  Prof. 
  Morgan 
  states 
  that 
  

   it 
  is 
  very 
  abundant 
  on 
  the 
  " 
  china-tree 
  " 
  in 
  Louisiana. 
  It 
  is 
  recorded 
  as 
  

   a 
  pest 
  of 
  the 
  olive 
  in 
  countries 
  where 
  that 
  tree 
  grows. 
  Prof, 
  Johnson 
  

   :States 
  that 
  it 
  is 
  particularly 
  destructive 
  in 
  Maryland 
  to 
  Asparagus 
  

   plumosus, 
  the 
  so-called 
  lace 
  fern. 
  D. 
  W. 
  Coquillett 
  records 
  it 
  in 
  

   California 
  on 
  the 
  following 
  additional 
  plants: 
  lilac, 
  arbor 
  .vitae, 
  century 
  

   plant 
  or 
  aloe, 
  oak, 
  Quercus 
  agri 
  folia, 
  and 
  nightshade, 
  S 
  o 
  1 
  a 
  n 
  u 
  m 
  

   douglasii. 
  It 
  has 
  also 
  been 
  collected 
  in 
  Albany 
  greenhouses 
  on 
  

   Areca 
  lutescens, 
  Cyperus, 
  Kentia 
  belmoreana 
  and 
  

   Strelitzia 
  reginae. 
  

  

  Natural 
  enemies. 
  Prof. 
  Morgan 
  reports 
  rearing 
  a 
  hymenopterous 
  

   parasite 
  from 
  this 
  scale 
  insect, 
  and 
  Mr 
  Coquillett 
  states 
  that 
  the 
  imported 
  

   Australian 
  lady 
  bug, 
  Rhizobius 
  debilis 
  Blackb., 
  feeds 
  on 
  this 
  

   species 
  in 
  California. 
  

  

  Preventives 
  and 
  remedies. 
  It 
  is 
  comparatively 
  easy 
  to 
  control 
  

  

  this 
  insect 
  in 
  New 
  York 
  state, 
  since 
  it 
  can 
  not 
  live 
  outdoors. 
  It 
  can 
  be 
  

  

  kept 
  in 
  check 
  by 
  spraying 
  or 
  washing 
  the 
  infested 
  plants 
  with 
  whale 
  oil 
  

  

  soap 
  solution 
  (i 
  pound 
  to 
  about 
  5 
  gallons), 
  kerosene 
  emulsion 
  (diluted 
  

  

  with 
  12 
  parts 
  of 
  water, 
  see 
  p. 
  339) 
  or 
  an 
  ivory 
  soap 
  solution 
  (a 
  5 
  cent 
  

  

  cake 
  of 
  the 
  latter 
  to 
  8 
  gallons 
  of 
  water). 
  These 
  substances 
  will 
  hardly 
  

  

  do 
  more 
  than 
  keep 
  this 
  insect 
  in 
  check, 
  and 
  repeated 
  applications 
  will 
  be 
  

  

  necessary. 
  It 
  will 
  be 
  much 
  more 
  satisfactory, 
  as 
  a 
  rule, 
  to 
  clean 
  the 
  

  

  greenhouse 
  thoroughly 
  in 
  the 
  summer 
  and 
  then 
  stock 
  up 
  with 
  clean 
  

  

  plants. 
  

  

  Bibliography 
  

  

  The 
  more 
  important 
  articles 
  treating 
  of 
  this 
  species 
  in 
  America 
  are 
  

   listed 
  below. 
  No 
  attempt 
  has 
  been 
  made 
  to 
  look 
  up 
  references 
  in 
  foreign 
  

   publications, 
  as 
  the 
  list, 
  at 
  best, 
  would 
  be 
  very 
  incomplete. 
  

  

  Signoret, 
  Victor. 
  Essai 
  sur 
  les 
  Cochenilles 
  ou 
  GaUinsectes. 
  1868. 
  

   p. 
  96-97 
  (description) 
  100-3 
  (food 
  plants, 
  description, 
  as 
  A. 
  nerii). 
  

  

  