Technomyrmex vitiensis a Challenge for Tropical Greenhouses
Transcript of Technomyrmex vitiensis a Challenge for Tropical Greenhouses
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Conclusion:
The White footed ant (genus Technomyrmex vitiensis, Formicidae,Dolichoderinae) is native to the Pacific and Indo-Australian region and wasintroduced by global trade to European tropical greenhouses at the end oflast century. It is now the most common ant species in buildings with tropicalclimate. The species has decentralized colonies over large territories and theworkers tend aphids. Large colonies may interfere with the biological controlprograms to control aphids in tropical greenhouses.
(Lecture at the Conference of the DGaaE 2015 in Frankfurt)
Technomyrmex vitiensis –
a Challenge for Tropical Greenhouses
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Technomyrmex vitiensis –
a Challenge for Tropical Greenhouses
Reiner PospischilBergheim-Erft Germany
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1900 19751950 1990 2000 2014
Cardiocondyla
sp.
Plagiolepis
sp.
Hypoponera
sp.
Linepithema
humile
Tapinoma
melanocephalum
Monomorium
pharaonis
Technomyrmex
vitiensis
Tetramorium
bicarinatum
Introduction of Ants Into Tropical Greenhouses
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Distribution of Technomyrmex vitiensis
in Central Europe
DNL
GB
F A
CH
B
PL
CZ
IFurther ref.:
Bolton 2006, Vierbergen 2003
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Ants Found in Buildings With Tropical Climate in
NL (Boer & Vierbergen 2008)
before 1945 1946 – 1999 2000 - 2006
Formicinae
Plagiolepis sp. (alluaudi) - 4 2
Dolichoderinae
Linepithema humile x -
Tapinoma melanocephalum x -
Technomyrmex albipes (vitiensis ?) 1 8
Myrmicinae
Monomorium pharaonis x -
Pheidole megacephala - 1 1
Pheidole fervens 1 1 -
Pheidole anastasii 2 2 1
Tetramorium bicarinatum 5 3 2
Tetramorium insolens 1 2
Pseudomyrmecinae
Pseudomyrmex gracilis - 1 1
Ponerinae
Hypoponera schauinslandi 1 2 5
Counts from 9 botanical and zoological gardens
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Zoological
(4)
1
3
Office
(1)
1
Others
(1)
1
Lasius emarginatus, niger
Technomyrmex vitiensis
Tetramorium bicarinatum
Pheidole sp.
Botanical
(18)
2
9
8
2
Total
(24)
2
10
10
5
T. bicarinatumL. niger T. vitiensis Pheidole sp
Locations
Species
Samples were sent from 24 different places (11. 2008)
Distribution of Exotic Ants in
Botanical/Zoological Buildings in 1 Garden!
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2
(5)
2
1
3
(8)
3
8
2
4
(3)
2
1
Lasius emarginatus, niger
Technomyrmex vitiensis
Tetramorium bicarinatum
Solenopsis molesta
Temnothorax unifasciata
1
(6)
2
1
2
1
Total
(27)
7
18
7
1
1
T. bicarinatumL. niger T. vitiensis Solenopsis molesta
Locations
Species
Samples were sent from 24 different places (04. 2012)
Distribution of Exotic Ants in Tropical
Botanical/Zoological Buildings in 1 Garden!
5
(2)
2
1
6
(3)
4
2
>
>>
<
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Occurrence and Identification
T. vitiensis
1Bolton 2007 , 2Wetterer 2008, 3Boer & Vierbergen
Technomyrmex
vitiensis
Technomyrmex
albipes
Technomyrmex
difficilis
Origin Continental and
Insular southeast
Asia2
Continental and
Insular southeast
Asia2
Madagascar1,2
Introduction Europe1,2
San Francisco CA
French Guiana SA
Netherlands,
Belgium3
Florida, Georgia,
Lousiana, South
Carolina, Seattle
Australia?
Identification 1 pair of pronotal hairs,
1 pair of propodeal hairs
2 pairs of pronotal hairs,
2 pairs of propodeal
hairs
1 pair of pronotal hairs,
1 pair of mesonotal
hairs,
1 pair of propodeal hairs
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Technomyrmex vitiensis –
Factors for its success as tramp ant
Decentralized colonies over large territories with regular exchange of workers;
Inseminated queens only in new colonies and later replaced by intercastes;
Transfer of nutrients through trophic eggs; (Yamauchi et al 1991)
Interference with the biological control programs to control aphids.
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Nutrition sources
Honey dew
Plant juice
Honey
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Technomyrmex
vitiensis
Construction of
galleries on leaves
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Transfer of nutrients
through trophic eggs
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1
4
2
3
Polyrhachis ammon
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T. vitiensis as hygiene pest in a cafeteria
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T. vitiensis – an Ant – Plant Community
Myrmecodia platyrea (Myrmecodia)
Myrmecodia sp. are epiphytic plants with origin in South Asia and Australia. They develop
bulbs with cavities which have small exits and are colonized by different ant species
(Technomyrmex, Tapinoma, Tetramorium, Plagiolepis and others).
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Nests below dead leaves on palmes
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Components of an Effective Ant Management
Programm in Buildings With Tropical Climate
1. Identification;
2. Detection of the nesting sites and the trails ;
4. Selection of a suitable control strategy;
5. To close cracks and crevices in the foundation;
6. Documentation
Preventive measures in buildings with tropical climate (zoological and botanical
gardens, tropical bathes, restaurants, hotels, shoping moles etc.
Quarantaine of new plants but also trunks, branches and roots (to be placed on
the ground as underground or fixing for plants), in a special room which is not
connected to the green house or the plantation;
Nocturnal inspection of the greenhouse or plantation;
Removal of dead vegetation (leaves, trunks, bark etc.) and fallen down fruits.
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Conclusion
Small decentralised nests
Delivery of nutritient through trophic eggs
The primary queen is replaced by workers
Workers (+brood) leave their nest immediately when disturbed
Outnumber native ant species
They tend aphids and protect them effektively against predators and control
measures;
Buildings with tropical climate provide excellent conditions for the
establishment of Technomyrmex vitiensis.
Distribution of small Technomyrmex colonies with potted plants, flowers,
branches and roots
Transmission of plant diseases may also be possible.
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References
BOER, R. & VIERBERGEN, B. (2008): Exotic ants in the Netherlands (Hymenoptera:
Formicidae). Entomologische Berichten 68: 121-129.
BOLTON, B. (2007): Taxonomy of the Dolichoderinae ant genus Technomyrmex Mayr
(Hymenoptera: Formicidae) based on the worker caste. Contributions of the Amercan
Entomological Institute 35: 1-149.
VIERBERGEN, G. (2003): Technomyrmex albipes en andere exoten in Nederland. Forum
Formicedarum 4: 4-7.
WETTERER, J.K. (2008): Technomyrmex difficilis (Hymenoptera: Formicidae) in the West
Indies. Florida Entomol. 91: 428-430.
Yamauchi, K., Furukawa, T., Kinomura, K., Takamine, H. & Tsuji, K. (1991): Secondary
polygyny by inbred wingless sexuals in the dolichoderine ant Technomyrmex albipes.
Behavioral Ecology and Sociobiology 29: 313-319.
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Questions please ???
Thank you very much for your attention