ants is after the flower of my citrus tree

by Ronald
(cuasay)

how can i prevent ants from climbing my citrus tree? i think their sucking the nectar and eating the vitamin of the flower.and when the baby citrus comes out they just fall out.and it make me sad.ps.this is not a regular citrus tree. we call it kalamansi or kalamunding really famous in the philippines.its like lime fruit but really small.but juicy and better flavor.pls help with my problem.regards and more power.