ミノムシ いとあはれなり - kochi uarakawar/bagworm/08seminarslide.pdf · 2011-08-22 ·...
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ミノムシミノムシいといとああはれなりはれなり
Dr. Ryo ADr. Ryo ARAKAWARAKAWAEntomological Lab.Entomological Lab.
Kochi Univ.Kochi Univ.
A bagworm is A bagworm is very lovelyvery lovely
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Eumeta variegata (=E. japonica)
BagwormBagworm (Minomushi)(Minomushi)
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BagwormBagworm
Larva of psychid moth
(Lepidoptera: Psychidae)
World: 1,700 spp.
Japan: 21 spp.
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Their outbreak hasTheir outbreak has sometimes occurred before and they sometimes occurred before and they are known as the pest of orchardare known as the pest of orchard and garden trees.and garden trees.
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Eumeta variegata(Oo-minoga)ca. 5cm
Eumeta minuscula(Cha-minoga)ca. 3cm
Common bagworm in Japan
Winter season
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Overwinter(diapause) insilken bag
Foraging(Larva)
PupationEmergenceOviposition
Wi Sp Su Au Wi Sp Su Au Wi
generation generation
Life cycle of E. variegata
After diapause termination
No foraging → E. variegata
Foraging → E. minuscula
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Male of E. variegata
3-4cmpupal sheath
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Female after oviposition
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First instar larva of E. variegata just after hatching
1mm
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Silken bag making by the 1st instar larva
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Silken bag making completed
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Jan. 12, 1999Asahi Shimbun
A species of parasitic fly has invaded from China.
The bagworm has fear of extinction in west Japan.
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Adult of Nealsomyia rufella(Diptera: Tachinidae)
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NealsomyiaNealsomyia rufellarufella
♂ ♀Small egg productive type
Oviposit on the leaf foraging by E. variegata larva
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Eggs of N. rufella on the chestnut leaf
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Eggs of N. rufella
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Puparia of the parasitic fly and dead body of bagworm.
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Gregarious parasitismGregarious parasitism((Sep. 23, 2007 Kochi Univ.Sep. 23, 2007 Kochi Univ.))
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How did N. rufella invade to Japan?
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Invaded pests
Classical Classical Biological ControlBiological Control
Introduced natural enemiesfrom the original habitat of pests
permanent control
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IceryaIcerya pruchasipruchasi and and RodoliaRodolia cardinaliscardinalisイセリアカイガラムシとベダリアテントウイセリアカイガラムシとベダリアテントウ
Classical Classical Biological ControlBiological Control
(The end of the 19th century)
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A variety of natural agents killing another organisms in nature.
A predator, parasite, parasitoid or pathogen of another animal, especially an insect. Several species have been using as the biological control agents.
Natural EnemiesNatural Enemies
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Adults are free living. Females search hosts and oviposit on, in or near the host.
ParasitoidsParasitoidsparasitic waspsparasitic flies
Larva of parasitoid consumes one or less than one host for its lifetime.
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In Shandong, N. rufella was introduced from Southern China to control E. variegata in about 1990.
山東省
Shandong province
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Study area in Kochi Pref.
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Younger larva parasitized by the fly.
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Head width of bagworm
No.
of p
upar
iain
a b
ag
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Parasitic character of Parasitic character of N. N. rufellarufella
host specifichost specificmultivoltinemultivoltine (against (against univoltineunivoltine
host)host)gregariousgregarious parasitismparasitism
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Life cycles of E. variegata and N. rufella
Overwinter
Pupa AdultEgg Larva (Foraging) Overwinter
Apr. Jun. Aug. Oct. Dec. Feb.
??
Univoltine (年1化性)
Multivoltine (多化性)
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Mar. 22, 2000Kochi Shimbun
The density of the bagworm has extremely decreasedbecause of parasitism by invaded fly.
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Dec. 14, 2001Yomiuri Shimbun
Protection of the bagworm is expected.
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Jan. 29, 2002
Weekly Playboy, Japan
Dear bagworm,are you extinction?
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Parasitism and alive of E. variegata
0
%
100
1999 2000Year
5029.5
90.3
19.31.1 5.6 4.0 4.4
65.9 65.1 62.3
2001 2002 2003
Parasitism
Adult emergence
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Parasitism of different area
2000 2001 2002
50
%
100Nankoku
Aki
Nakamura
KubokawaSagawa
1999Year
0
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We found that severalWe found that several indigenous indigenous natural enemies attacked natural enemies attacked N. N. rufellarufella
in Kochi Pref.in Kochi Pref.
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Parasitic wasps emerged from the Parasitic wasps emerged from the pupariumpuparium of of N. N. rufellarufella..
Brachymeria lasus(Chalcididae) Eulophidae sp.1
Eulophidae sp.2 Eulophidae sp.3
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Parasitic wasps emerged from the Parasitic wasps emerged from the pupariumpupariumof of N. N. rufellarufella..
Pteromalidae sp.1
Eupelmidae sp. Trigonalidae sp.
Pteromalidae sp.2
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In 2002・ location 16/24・Silkenbag 101/854(11.8%)・Puparium 183/7.297 (2.5%)
Dominant species: Brachymeria lasus(キアシブトコバチ)
Hyperparasitism(高次寄生)
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Predation by Jumping Spider (Just after adult emeregence)
Sep. 9, 2000, Kochi Univ.
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Predation by Ants in Silken BagAug. 30, 2007, Kochi Univ.
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Present condition of Present condition of E. E. vareiagatavareiagata and and N. N. rufellarufella in Kochi Pref.in Kochi Pref.
N. N. rufellarufella is established.is established.E. E. variegatavariegata still alive.still alive. (Not (Not
extincionextincion)) Indigenous natural enemies attack Indigenous natural enemies attack
N. N. rufellarufella..
Ecological stability
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ConclusionConclusion
E. E. variegatavariegata and and N. N. rufellarufellawill continuewill continue coexistence.coexistence.
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E. variegata
E. minuscula
Wanted
No need