Aggressive colonies of bees are not good fun. They make inspections awkward and it's the easiest way to annoy your neighbours. 

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Requeening an aggressive colony with a mated queen of known heritage will resolve the issue of aggression but it can take around 10-12 weeks to take effect as the older bees die off. 

Diseases, viruses and infections such as chalk brood, sac brood, bald brood and even EFB can often be eradicated by requeening your colony with a queen of known heritage.

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It's good practise to combine the requeening with comb replacement before the introduction to reduce the chance of reinfection.

Queens will need to replaced every 2-3 years. You can leave the bees to do this for you through a process called supersedure, but this does not guarantee the queen will be correctly mated and some still like to requeen with a mated queen.

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At BMH, we requeen our hives every 2 years.