For heavy ant infestations use Greenway Liquid Ant Bait Gel. It is a highly attractive, formulated ant bait that works amazingly for all species of ants. This six pack of 42.5g Individual syringes come with easy to apply plungers for controlled application and cap to prevent drying out. Each package contains 6 X syringes is 42.5g of liquid bait for larger ant issues.
PRO TIP: Try to apply bait on a piece of tape or in a cut straw to prevent evaporation into ground (Follow labeled instructions).
PRO TIP: Ants will mark a trail back to your placements, so keep the bait fresh and in the same place. They will consume far more than you ever imagined!