Frelon européen ou asiatique : comment les différencier ?

The Asian hornet : 
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June 19, 2009
News of the trapping 2009 Dordogne sarladaise's valley 

Disappointment goes up in the trappers.They passed from the capture of the young queens to the capture of the young workers. In fact in mid-June they capture simultaneously supposed founders and workers of spring 2009. It will seem well that their traps works for nothing ,just  wandering insects completely unable to build a nest. On the 4 trapped sectors; it was captured workers 2009, out of 3 sectors. there is no captures of workers on the 4th sector. ….

Congratulation for Jean François (voluntary) for the  enormous work of precision he realized.... 

Chart of the colonized deparment (http://www.frelon-asiatique.com/09/img/carte.mnhn.jpg ) in France source : Muséum National Histoire Naturelle (Paris)

Other sectors:
 On the 2 micro territories (Sergeac and Galinat) éradiqués into 2008 the catches of supposed founders account for 10% of the quantity trapped in 2008.
June 17, 2009
new testing site of the Frelons : 

2009 installation of a colony of Vespa crabo close to the hives of the greenhouse of Galinat. Happy surprised in May: two young queens Vespa crabo elected residence in the garden of Galinat. One in a hive,the other under ground. (a green lizard also brooded one in this same garden, it will be preserved)
 Friday June 19, it will be installed an enlarging with the Queen who is in the hive with a windows of sight inside Thus it will have a rather consequent volume, we hope which will remain in this housing increased especially for it (photos) 
Required observations: - reality of the predation of Vespa crabo on the hives. 2010,installation of two colonies, one of European Frelon,the other of Frelons Asian on the same site of the greenhouse of Galinat and the experimental hives of the same hamlet.
Required observations
: - reality of the predation of the Vespa crabo and the nigrithorax on the hives with the cohabitation (or competes with) of the two species - incidence of the cohabitation of the two species on the bees.maybe some  video's to certify the observations
April 25, 2009
How to build a residential trap ? from now only one month to capture the young queens
April 23, 2009 
http://www.frelon-asiatique.com/ccpn/comparatif_2007_2008.gif
This link led towards a graph which in known as length on the incertitude of the founder traps. Think of multiplying by 10 the green columns to obtain the number of traps in 2008 per commune. Currently the results are reduced to this graph. They represent one year under review (2007) for the discovered nests, one spring of trapping (2008) and the nests discovered in 2008. The territories of these communes were passed to the fine comb. It is improbable that nests on the trees is forgotten. This graph seems to give reason to those which think that the traps are not very useful. There or we think that the good pressure of the traps of summer that s' it passed if this n' is not the captures which reduced the number of nest?. Which is l' crucial factor which on seven common made that the number of nest increased in 2008 in spite of the 750 captures of supposed founders? Concurrently to that of the micro sectors completely kill the Frelons in 2008. The two nests under the place says Farouchie to Sergeac are nests established for observations and studies after the countryside of the traps 2008. 
http://www.frelon-asiatique.com/09/Galinat_Sergeac_2009.jpg.
 
We seek the small ones for studies, thank you to announce us all discovery of small nests 2009 before destruction

March 26, 2009 
The ball of the beginners (humorous reference to the ball of the beginners of G7) was open on March 20, 2009 sarladais some. Hardly the orchestra it had started to play the waltz of Vienna that already our friend Thierry had chosen " its reine". D' a so light step which we would have thought qu' they went s' to fly away, it whirled with its beautiful and s' hurled resolutely turned about the springtide. L' year 2008, c' was our friend Jean Pierre who had opened the ball on March 30 in Dordogne valley, sector sarladais (CCPS). In sarladais the ball was open on March 23, 2009 to the hive of Galinat, l' last year on Friday March 14, 2008 had been taken to the supposed first founder at the same place. 

mars 06,  2009
It is by end of August or in September that the life of an asian hornet colony begins. It is at this moment that the breeding of the sexual generation begins. The queen of the year lays non fertilized eggs which will give males  and, at the same time,  fertile eggs which will give females. Is it the presence of the males in the brood that determines the production of sexual females. It may be that the females which will become queens  receive different feeding from that received by the workers. With a better feeding they should be able to develop sexually whereas the workers remain sterile. One day Science will be able to understand the difference which produces a worker or a young future queen. 

As the queen  becomes adult, the sexual females escape from the nest together with the males which will fertilize them. Some go far away, some others stay near the area where they are born. They will rest during the winter in any natural such as trees, burrows, holes or any other space which will protect them from cold. 

In Spring, February of March, depending upon the weather of the area, the young queen begins to dance in order to find a place where to set up its colony. She begins to build a nest, initially as big as a hen’s egg. The young queen will collect various materials to build the nest. She will also need great quantities of water to produce pulp to strengthen the nest. Soon she will also need insects to feed  the larvae. She will breed alone the first brood of workers which will be the size of a wasp and which will be born over five weeks after which they will leave the nest. 

It is at this moment that we will wait for them with our traps to try to capture them. Without them the nest will be condemned to die, even before being active. But many others will avoid the traps  and survive. It is necessary to seek them out during the summer, before the end of August, in order to exterminate them, since at this time, the sexual reproduction will begin again. 

As soon as the number of workers become sufficient (50 to 60) to undertake the enlargement of the nest, the young queen will not help anymore. She  will only lay. Until the end of the summer, she will lay only  fertilized eggs which will give birth to workers. Then the laying of the sexual generation will continue until October. 

When a queen dies, sometimes, a worker takes her place and begins to lay but, since she is not fertilized she will produce only males off spring and the colony will die early in the summer. From mid-September to end of October, the queen will decline. Some of them will not have enough reserves of sperm, therefore they will only lay unfertilised eggs. This will mean the demise of the colony because the males do not participate in the activity of the colony. These colonies will be the first to die. 

In September, they are still  some colonies which have few males and lot of workers and a small brood ; this explains that they are still alive. In a nest caught last year, there was still a small brood alive, some larvae and enough insects to discourage the birds from eating the larvae. But the colony gradually dies. Some adults remain active for some time but the cold  and old age result in the demise of last survivals. 

The birds are free to eat the larvae.

 
 
Le Frelon d'Europe est marron de corps et la presque totalité de l'abdomen est jaune (sur la photo l'anneau noir de l'abdomen du frelon d'Europe est l'aiguille qui a décollé deux anneaux jaunes).
Le Frelon Asiatique a un liseré jaune entre les deux premiers anneaux de l'abdomen, et entre le 2e et le 3e anneau un liseré orange. Ensuite il a le 4e anneau orangé avec la couleur qui se poursuit sous le ventre vers les 2e et 3e anneau. Le thorax est noir et velu. Le deux dernières extrémités de leurs pattes sont jaune clair. Leur front orangé les distingue bien des européens.
 Cliquer ici : frelon d'Asie et européen, comparaison
 Nid de frelon asiatique de +/- 3 000 ouvrières

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Fichier créé le 09/09/2007 - mise à jour le mardi 30 juin 2009 - Rédacteur : Christian Ceyral