See it before you spray
Best insect monitors
The best insect monitor is the card that matches the pest. A roach monitor on a kitchen floor, a flat glue board under a stove, and a yellow card in a plant are three different buys. A single “bug trap” in the living room answers none of those questions. Monitors are how you avoid spraying the wrong room.
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Best for cockroaches: Sticky cockroach / insect monitors. Date the card. Count adults and nymphs a week later. That number decides whether the gel is working.
Compare the picks
| Role | Tool | Best for | Type |
|---|---|---|---|
| Best for cockroaches | Sticky cockroach / insect monitors | Kitchens and baths | Hardware |
| Best general crawling monitor | Catchmaster 72MAX glue boards | Wall-floor joints and under appliances | Hardware |
| Best for flying gnats | Yellow sticky insect cards | Houseplants | Hardware |
Which one to buy
Hardware
Sticky cockroach / insect monitors
Best for cockroaches — Date the card. Count adults and nymphs a week later. That number decides whether the gel is working.
Hardware
Catchmaster 72MAX glue boards
Best general crawling monitor — Spiders, roaches, and the occasional mouse. Flat enough to matter. Replace when dusty.
Hardware
Yellow sticky insect cards
Best for flying gnats — Yellow cards are a fungus-gnat tool, not a roach tool. Do not put them on a kitchen counter and call it monitoring.
A monitor is a decision tool
Write the date on the card. If the count drops after bait and sanitation, stay the course. If it does not, you treated the wrong crack or the wrong unit. Buying a second spray because the first card was never read is how kitchens fill up with repellent and the roaches move next door.
Common questions
What is the best sticky trap for indoor bugs?
The one placed for the insect you have. Roach monitors for cockroaches, yellow cards for fungus gnats, flat boards for spiders and general crawlers.
How long do I leave a monitor out?
A week is enough to aim a treatment. Leave a fresh card after treatment to see the trend. A card left until it is a dust mat is not data.
Do monitors replace bait?
No. They tell you where the bait should go and whether it worked.