Category: DIY Pest Control Reviews
Last Major Revision: April 2026
Expert Review: Verified by The PCC Research Team
The Verdict: Sugar or Protein?
In 90% of California homes, ants are looking for sugar, which makes Terro the king. However, professional exterminators often carry Combat for “picky” ants that ignore sweets. Which one do you need?
The “Sugar” Feeder
Terro Liquid Bait (T300) is essentially poisoned syrup. It is the gold standard for Argentine Ants during summer when the colony needs energy. Caution: It is messy.
The “Protein” Feeder
Combat Max Gel is a savory blend. It is the best choice for “Grease Ants” or springtime invasions when the Queen needs protein to lay eggs. Bonus: It’s clean and precise.
Quick Navigation:
1. The “Peanut Butter Test” (Do This First)
The #1 reason people say “Ant bait doesn’t work” is that they are feeding the ants the wrong flavor. Before you buy anything, do this free test:
The 20-Minute Test
Place a dot of Honey and a dot of Peanut Butter next to the ant trail. Wait 20 minutes.
- Swarming the Honey? → Buy Terro (Sugar).
- Swarming the Peanut Butter? → Buy Combat Gel (Protein).
2. Head-to-Head: Specs & Ingredients
| Feature | Terro (Liquid T300) |
Combat (Max Killing Gel) |
|---|---|---|
| Form Factor | Liquid Drop | Gel Syringe |
| Active Ingredient | Borax (5.4%) | Fipronil (0.001%) |
| Primary Diet | Sugar / Carbs | Protein + Sugar Mix |
| Kill Speed | Slow (24-48 hours) | Fast (12-24 hours) |
| Best Application | Flat Floors / Counters | Cracks / Vertical Walls |
Terro (The Slow Killer): Uses Borax. It works slowly, allowing the worker ant to survive long enough to walk back to the nest and share the poisoned sugar with the Queen. You want them to survive the trip.
Combat (The Nerve Toxin): Uses Fipronil, a pro-grade termiticide. It is incredibly potent and can trigger a “domino effect” faster than Borax, making it better for aggressive infestations.
3. The Mess Factor & Pet Safety
If you have curious toddlers or pets, the form factor matters.
- Terro (Liquid Pools): These are open plastic stations filled with sticky syrup. If a dog chews on one, it gets everywhere. While Borax has low toxicity, it is a mess hazard.
- Combat (Gel Injection): This is the cleanest option. You can inject a tiny bead into a crack behind the toilet or under the baseboard where pets cannot reach. The gel stays put and doesn’t run.
4. Frequently Asked Questions
Q: Is Terro better than Combat?
A: Terro is better for sugar-feeding ants (common in summer), while Combat Max Gel is better for protein-feeding ants or grease ants. We recommend the ‘Peanut Butter Test’ to see which food source your ants prefer.
Q: Can I use Raid bug spray near the ant bait?
A: NEVER. This is the most common mistake. Spraying ants kills the workers before they can carry the bait back to the queen. For the bait to work, you must let the ants eat it and return to the nest alive.
Q: Why did the ants ignore the Terro liquid bait?
A: They are likely in a “Protein Cycle” (laying eggs). If they ignore the sugar in Terro, switch to Combat Gel immediately. Also, in California’s dry heat, liquid bait can dry out quickly. Replace it if it becomes a hard solid.
Q: Is Terro ant bait safe for dogs and pets?
A: Terro uses Borax, which has low toxicity for mammals, but it can cause stomach upset if ingested. The plastic stations can also be a choking hazard. Combat Gel is often easier to place in tight cracks completely out of reach of pets.
Q: Do Terro and Combat work on Carpenter Ants?
A: Usually no. Terro and Combat are often too weak for large Carpenter Ants. For structural pests like Carpenter Ants, professionals recommend specific granular baits like Advance 375A or a professional perimeter spray.