Laminated cardboard strip, 1.75 mm thick (305 × 38 mm) for varroa drop monitoring on mesh floors. Use with petroleum jelly: holds the adhesive layer without absorbing it. Disposable and low-cost.
Monitoring natural varroa drop is the first step in deciding whether to treat or wait. These 1.75 mm laminated cardboard strips slide into the mesh floor of the hive, coated with petroleum jelly, to trap mites as they fall through. After 3–7 days you pull them out and count — a simple, cheap method that requires no colony manipulation.
Unlike solid cardboard (which works better with water), laminated card holds petroleum jelly evenly on the surface without absorbing it. The adhesive layer stays active for several days, trapping every mite that drops without being dislodged by wind.
At 305 × 38 mm, it fits the most common mesh floors on the market. The 1.75 mm thickness gives enough rigidity to slide into the floor slot without bending, yet it is disposable and low-cost — ideal for routine monitoring throughout the season.
| Material | Laminated cardboard |
| Dimensions | 305 × 38 mm |
| Thickness | 1.75 mm |
| Recommended use | Natural varroa drop monitoring (with petroleum jelly) |
| Unit | 1 strip |

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Laminated cardboard strip, 1.75 mm thick (305 × 38 mm) for varroa drop monitoring on mesh floors. Use with petroleum jelly: holds the adhesive layer without absorbing it. Disposable and low-cost.
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