Erkki: Zwei Generationen pro Jahr
>Hello,
>
>Bombus hortorum is one common species which can has two generation in a year. But hypnorum and pratorum too.
>The rarely Bombus jonellus, has in normal summers, allways two generations but this is very different. In some areas the spring is very early for example in the west and southwest…
>
>For a second generation you need a early spring a long summer…
>
>Alex from Dortmund
Hello,
Is it old or new nest site where the young queens to produce the next generation?
Erkki from Espoo
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