[Pollination: in greenhouse bumble bees are better [Fragaria x ananassa Duch.; soft fruits species]]

apis mellifera bayas bombus terrestris colture in serra cultivos de invernadero date de traitement epoca di trattamento fecha de tratamiento fioritura floraison flowering fragaria ananassa fragole fraise fresa greenhouse crops impollinatori impollinazione insecte utile insetti utili nesting nidification nidificazione osmia petits fruits piccoli frutti plante de serre polen polinizadores pollen pollination pollinators polline pollinisateur pollinisation soft fruits strawberries treatment date useful insects