"The Brussels governor held an extraordinary session of the capital's government to coordinate measures to fight the larvae after it became known that these insects appeared in the city," Radio Contact reported.
A number of cities in the northern region of Flanders have been attacked by silkworm larvae. Firefighters and army units are fighting the insects.
Silkworms attacked Brussels four years ago, and local residents know they have to notify authorities if they see the insects.
Experts say silkworms are dangerous because they not only eat oak leaves and garden plants but cause humans to suffer from severe skin itching and respiratory diseases.