An entomologist, or an apiologist.
Entomologists.
a beekeeper
They study diseases.
a geneticist
Biologists.
Neurologists study the nervous system.
It depends on what kind of scientist it is. For example, botanists study plants.
a physist
An Anatomist - They study anatomy.
archaeologists.they also study dinosours :D
The study of bees is apiology
Melittology is the study of bees. Apiology is specifically the study of honey bees.
A herpetologist studies lizzards and snakes.