nfluence of adding some volatile oils to pollen substitutes on some activities of honey bee colonies

abeille ouvrière abejas obreras aceites esenciales alcanfor apis mellifera bee feeding camphor camphre consommation consumo consumption essential oils huile essentielle mortalidad mortality mortalité nourrissement des abeilles nutrición de abejas polen pollen rearing techniques technique d'élevage técnicas de crianza worker bees