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                                                                                     Table 1.1. 
           Some
examples showing the abundance of plants and animals dependent on the presence 
                            
                of one or a few
organisms in the ecosystem.
 
        
_________________________________________________________________________________________________________
      
Controlled Organisms                                              Causative Agent(s)
-- See <Detailed Cases> for discussion]
       
_________________________________________________________________________________________________________
 
| Phytophagous
  Insects | -------------------------------------------------------- | 
| Alfalfa
  weevil in coastal California----------------------------- | Bathyplectes curculionis (Thoms.) | 
| Apple
  mealybug in Canada---------------------------------------- | Allotropa
  utilis Muesebeck | 
| Black
  scale in southern California----------------------------- | Metaphycus helvolus (Compere) | 
| Blue
  gum scale in New Zealand---------------------------------- | Rhizobius ventralis (Erichson) | 
| Brown-tail
  moth in Canada---------------------------------------- | Compsilura
  concinnata (Mg.), Apanteles lacteicolor Viereck
  & Meteorus versicolor | 
| California red scale in California
  & Europe------------------ | Aphytis melinus DeBach | 
| Citrophilus mealybug in
  California----------------------------- | Coccophagus gurneyi Compere | 
| Citrus
  blackfly in Cuba--------------------------------------------- | Eretmocerus
  serius Silvestri | 
| Citrus
  blackfly in Mexico------------------------------------------ | Amitus
  hesperidum Silvestri, Prospaltella opulenta
  Silvestri | 
| Citrus
  mealybug in Israel------------------------------------------ | Clausenia purpurea Ishii | 
| Coconut
  leaf mining beetle in Fiji-------------------------------- | Pleurotropic
  parvulus Ferr. | 
| Coconut
  moth in Fiji------------------------------------------------- | Ptychomyia
  remota Aldrich | 
| Coconut
  scale in Fiji------------------------------------------------- | Cryptognatha nodiceps Mshll | 
| Coconut
  scale in Mauritius---------------------------------------- | Chilocorus politus Muls. & C.
  nigritus Muls. | 
| Coffee
  mealybug in Kenya             ----------------------------------------- | Anagyrus nr. kivuensis
  (Compere) | 
| Comstock
  mealybug in California------------------------------- | Allotropa
  burrelli Muesebeck & Pseudaphycus malinus Gahan | 
| Cottony-cushion
  scale in >50 countries------------------------ | Rodolia cardinalis (Mulsant) &/or Cryptochaetum iceryae
  (Willis.) | 
| Diamond-back
  moth in New Zealand---------------------------- | Angitia
  cerophaga (Grav.) | 
| Dictyospermum scale in Greece--------------------------------- | Aphytis melinus DeBach | 
| Florida red scale in Israel,
  Florida, Africa, S. Amer ------- | Aphytis
  holoxanthus DeBach | 
| Green vegetable bug in Australia
  & Hawaii------------------- | Trissolcus
  basalis (Wollaston), etc. | 
| Navel Orangeworm
  -------------------------------------------------- | Goniozus legneri,
  Goniozus emigratus & Copidosomopsis plethorica Caltagirone | 
| Olive
  scale in California and Europe---------------------------- | Aphytis maculicornis (Masi) & Coccophagoides utilis Doutt | 
| Oriental
  beetle in Saipan------------------------------------------- | Campsomeris annulata Fab. | 
| Oriental
  fruit fly in Hawaii---------------------------------------- | Opius oophilus Fullaway | 
| Purple
  scale in California------------------------------------------ | Aphytis lepidosaphes Compere | 
| Red
  wax scale in Japan---------------------------------------------- | Anicetus beneficus Ishii & Yasumatsu | 
| Rhodesgrass
  scale in southeastern United States----------- | Neodusmetia
  sangwani (Rao) | 
| Spiny
  blackfly in Japan--------------------------------------------- | Prospaltella
  smithi Silvestri | 
| Sugarcane borer in
  Barbados------------------------------------ | Apanteles
  flavipes (Cameron) | 
| Sugarcane
  leafhopper in Hawaii--------------------------------- | Cyrtorhinus mundulus (Bredd.) | 
| Tea tortrix in Sri
  Lanka-------------------------------------------- | Macrocentrus homonae Nixon | 
| Walnut
  aphid in central California                ----------------------------- | Trioxys sp. from Iran | 
| Walnut
  aphid in southern California--------------------------- | Trioxys pallidus Haliday from France | 
| Winter
  moth in Canada-------------------------------------------- | Cyzenis albicans (Fall.) & Agrypon flaveolatus (Grav.) | 
| Winter
  moth in England------------------------------------------- | Small
  rodents (feeding on overwintering pupae) | 
| Woolly
  apple aphid in New Zealand----------------------------- | Aphelinus mali (Hald.) | 
|   |   | 
| Terrestrial
  Plants | --------------------------------------------------------- | 
| American
  chestnut in eastern North America--------------- | Endothia
  parasitica (Murr.) | 
| American
  elms in eastern North America-------------------- | Scolytus multistriatus (Marsham) vectoring Ceratocystis ulmi (Buisman)
  C. Moreau | 
| Apple
  trees in Europe----------------------------------------------- | Prospaltella perniciosi Tow attacking San Jose Scale | 
| Endemic
  cedars in Bermuda-------------------------------------- | Carulaspis visci (Schrank) & Lepidosaphes newsteadi (Sulc.) | 
| Eucalyptus
  at <500 meters in South Africa------------------- | Patasson nitens (Girault) attacking eucalyptus snout beetle | 
| Eucalyptus
  at >500 meters in South Africa------------------- | Patasson nitens, but at a higher density | 
| Klamath
  weed in northwestern United States----------------- | Chrysolina
  hyperici (Forster) & C. quadrigemina
  (Suffrian) | 
| Opuntia cactus in
  Australia--------------------------------------- | Cactoblastis cactorum (Berg) | 
| Opuntia cactus in Sri Lanka-------------------------------------- | Dactylopius indicus
  Green | 
| Opuntia cactus on Santa Cruz Island, Calif.------------------ | Dactylopius sp. | 
| Puncturevine
  in coastal California               ----------------------------- | Microlarinus lypriformis (Woll.) | 
|   |   | 
| Aquatic
  Plants | --------------------------------------------------------- | 
| Eichornia in
  Florida------------------------------------------------- | Neochetina bruchi | 
| Potamogeton the Imperial Valley, California---------------- | Tilapia zillii (Gervais) | 
|   |   | 
| Medical
  & Veterinary Pests | --------------------------------------------------------- | 
| Black
  stable fly in Mauritius-------------------------------------- | Tachinaephagus stomoxcida Subba-Rao | 
| Chironomid
  midges in L.A drainage channels--------------- | Oreochromis hornorum Trewazas & O. mossambica (Peters) | 
| Common
  housefly in S. Africa & New Zealand-------------- | Tachinaephagus zealandicus Ashmead | 
| Culex mosquitoes in California irrigation
  drains----------- | Gambusia & Cyprinodon
  spp. | 
| Culex mosquitoes in California rice
  fields-------------------- | Mesostoma flatworms | 
| Housefly
  and stable fly in Puerto Rico-------------------------- | Spalangia nigroaenea Curtis, S.
  cameroni Perkins & S. endius   Walker | 
|   |   | 
| Vertebrates | --------------------------------------------------------- | 
| European
  rabbits in Australia------------------------------------- | Myxomytosis virus #1 | 
| European
  rabbits in England--------------------------------------- | Myxomytosis virus #2 | 
|   |   |