Across Colorado, the summer heat is drawing Japanese beetles out of their winter hibernations, albeit a bit later than normal.
This includes setting traps and surveying residents to determine how far the infestation spread from the original Grand Junction neighborhood beetles were spotted in last July.
“Despite their popularity, traps are not very effective at controlling the populations of these insects,” Mason said. “The pheromone used in the traps is very strong and can attract Japanese beetles from up to five miles away. And while it’s very satisfying to see the dead beetles in the trap, it can attract a lot more to the area that don’t make it into the trap.”
The best thing Coloradoans can do is hand pick beetles off the plants in the mornings or evenings when temperatures are cool, Mason said. Then, either squish them or drop them into a bowl of soapy water. When looking long term, Mason said the Extension office recommends reducing lawn watering — letting the first two to three inches dry out before watering again — and choosing low-water or plants that are unattractive to beetles.
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