﻿447 
  

  

  very 
  few 
  insect 
  pests 
  ; 
  the 
  young 
  trees 
  have 
  only 
  on 
  rare 
  occasions 
  

   had 
  to 
  be 
  replanted 
  o^^^ng 
  to 
  damage 
  done 
  by 
  insects, 
  and 
  older 
  trees 
  

   have 
  suffered 
  but 
  slightly 
  in 
  any 
  part 
  of 
  the 
  district. 
  Stored 
  coffee 
  

   is 
  attacked 
  by 
  the 
  Scolytid, 
  Stephanoderes 
  coffeae, 
  Haged., 
  though 
  the 
  

   berries 
  on 
  the 
  trees 
  appeared 
  quite 
  free 
  from 
  the 
  insect. 
  The 
  same 
  

   beetle 
  has 
  recently 
  been 
  recorded 
  from 
  Amani, 
  where 
  it 
  was 
  found 
  on 
  

   other 
  plants, 
  notably 
  on 
  w^ld 
  blackberry, 
  but 
  not 
  on 
  coffee. 
  Gowdey 
  

   noticed 
  that 
  Arabian 
  coffee 
  was 
  less 
  often 
  attacked 
  than 
  other 
  varieties, 
  

   an 
  observation 
  that 
  was 
  made 
  also 
  by 
  the 
  author 
  when 
  dealing 
  with 
  

   the 
  stored 
  berries 
  obtained 
  in 
  Bukoba. 
  The 
  coffee 
  borer, 
  Dirphya 
  

   (Nitocris) 
  princeps, 
  Jord., 
  is 
  occasionally 
  found 
  on 
  Arabian 
  and 
  the 
  so- 
  

   called 
  Guatemala 
  coffee. 
  The 
  bug, 
  Antestia 
  variegata, 
  var. 
  lineaticollis, 
  

   has 
  been 
  observed 
  on 
  Guatemala 
  coffee 
  and 
  a 
  species 
  of 
  Calidea 
  on 
  

   Arabian 
  coffee, 
  but 
  it 
  is 
  doubtful 
  whether 
  they 
  are 
  harmful. 
  Various 
  

   scale-insects 
  have 
  been 
  found, 
  which 
  have 
  sometimes 
  been 
  present 
  

   in 
  numbers 
  large 
  enough 
  to 
  do 
  serious 
  damage 
  to 
  young 
  trees 
  ; 
  the 
  

   most 
  common 
  is 
  Pulvinaria 
  psidii, 
  Mask., 
  which 
  has 
  been 
  also 
  observed 
  

   on 
  coffee 
  in 
  Uganda. 
  Ceroplastes 
  ceriferus, 
  And., 
  and 
  Coccus 
  (Lecanium) 
  

   viridis 
  also 
  occur. 
  Leaf 
  miners 
  are 
  rare 
  ; 
  Ceratitis 
  capitata, 
  Wied., 
  

   which 
  is 
  common 
  in 
  Uganda, 
  has 
  so 
  far 
  not 
  been 
  found 
  in 
  Bukoba. 
  

   The 
  only 
  species 
  of 
  termite 
  that 
  is 
  harmful 
  is 
  Termes 
  bellicosus, 
  which 
  

   sometimes 
  destroys 
  the 
  very 
  young 
  plants. 
  

  

  A 
  few 
  pests 
  have 
  been 
  observed 
  on 
  cotton 
  in 
  the 
  Nyassa-Upland 
  

   plantation, 
  near 
  Kifumbiro. 
  The 
  worst 
  of 
  these 
  is 
  probably 
  the 
  pink 
  

   boll-worm, 
  Gelechia 
  gossypiella. 
  The 
  bugs, 
  Dysdercus 
  fasciatus 
  and 
  

   D. 
  nigrofasciatus, 
  are 
  common; 
  and 
  also- 
  Phonoctonus 
  fasciatus, 
  which 
  

   m.ust 
  be 
  regarded 
  as 
  useful, 
  as 
  it 
  preys 
  upon 
  the 
  other 
  two 
  species. 
  

   The 
  buds 
  of 
  cotton 
  are 
  frequently 
  attacked 
  by 
  species 
  of 
  Mylabris. 
  

   A 
  species 
  of 
  Xyleborus 
  is 
  recorded 
  as 
  damaging 
  the 
  plants 
  by 
  eating 
  into 
  

   the 
  young 
  shoots 
  and 
  causing 
  them 
  to 
  dry 
  up. 
  

  

  MoRSTATT 
  (H.). 
  Die 
  wichtigsten 
  chemischen 
  Mittel 
  des 
  Pflanzen- 
  

   schutzes. 
  [The 
  most 
  important 
  chemical 
  methods 
  of 
  protecting 
  

   plants.] 
  — 
  Der 
  Pflanzer, 
  Daressalaam, 
  x, 
  no. 
  3, 
  March 
  1914, 
  

   pp. 
  144-149. 
  

  

  The 
  paper 
  gives 
  a 
  brief 
  summary 
  of 
  the 
  more 
  important 
  chemical 
  

   compounds 
  used 
  to 
  protect 
  cultivated 
  plants 
  from 
  insects 
  and 
  disease. 
  

   Petroleum 
  is 
  recommended 
  as 
  a 
  contact 
  insecticide 
  against 
  

   bugs, 
  grasshoppers, 
  beetles, 
  caterpillars, 
  etc. 
  ; 
  insects 
  collected 
  

   by 
  hand 
  are 
  readily 
  killed 
  when 
  dropped 
  into 
  a 
  wide-mouthed 
  vessel 
  

   containing 
  a 
  mixture 
  of 
  water 
  and 
  petroleum. 
  For 
  spraying, 
  the 
  

   following 
  solutions 
  are 
  recommended 
  : 
  from 
  J 
  to 
  3 
  per 
  cent, 
  soap 
  

   solution 
  ; 
  against 
  Aphids 
  and 
  small 
  insects 
  the 
  solution 
  should 
  be 
  

   weaker 
  than 
  against 
  larger 
  insects. 
  Petroleum 
  and 
  soap 
  emulsion 
  

   against 
  Aphids, 
  beetle 
  larvae 
  and 
  caterpillars 
  : 
  2^ 
  lb. 
  of 
  soap 
  to 
  be 
  

   dissolved 
  in 
  half 
  a 
  gallon 
  of 
  hot 
  water 
  and 
  mixed 
  with 
  2 
  gallons 
  of 
  

   petroleum 
  until 
  a 
  uniformly 
  milky 
  solution 
  is 
  obtained 
  ; 
  this 
  is 
  added 
  

   to 
  1 
  gallon 
  of 
  hot 
  w^ater 
  and 
  the 
  whole 
  is 
  diluted 
  with 
  100 
  gallons 
  of 
  

   cold 
  water. 
  Tobacco 
  mixture 
  is 
  used 
  against 
  Aphids, 
  scale-insects, 
  

   leaf-eating 
  beetles 
  and 
  their 
  larvae, 
  bugs, 
  etc. 
  ; 
  3 
  or 
  4 
  dried 
  tobacco 
  

   leaves 
  and 
  stems 
  are 
  cut 
  up 
  and 
  boiled 
  in 
  10 
  gallons 
  of 
  water 
  and 
  left 
  

   standing 
  for 
  24 
  hours 
  ; 
  10 
  to 
  20 
  lb. 
  of 
  soap 
  are 
  dissolved 
  in 
  4 
  gallons 
  

  

  