Mosquitoes will also be found in standing waters, finding breeding zones. If no enemies to disrupt their cycle, the mosquitoes breed faster to become some nuisance elements. However, the barrel lid is significant in preventing the nuisance mosquitoes from producing in the barrels. Additionally, you can also plant some plants such as tomatoes (check best fertilizer for tomatoes here) and lemon. If This pants are close to your barrel, then no mosquito can stick around.