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With a few exceptions, much of the country has endured a relatively mild winter, and according to the experts, that can have a direct impact on tick and mosquito populations. With that in mind, the National Pest Management Association (NPMA) has released its bi-annual Vector Sectors™ list of the top 10 U.S. cities with the greatest risk for increased pest pressure from vector pests for the remainder of winter and into spring.

mouse pest
House mice can spread diseases such as salmonella and their urine can trigger asthma and allergy symptoms. They can also damage property and are known to gnaw on wiring, sometimes sparking electrical fires. (Photo: National Pest Management Association)

“People aren’t the only ones enjoying the warmer-than-average winter season this year,” said Dr. Jim Fredericks, Senior Vice President of Public Affairs, NPMA. “These warm and wet conditions create the perfect recipe for pests like ticks, mosquitoes and cockroaches to get an early start to their peak season. Despite being a nuisance, these pests are capable of transmitting diseases to humans and pose significant threats to our health and well-being.”

The top 10 U.S. cities¹ named to NPMA’s Vector Sectors list include:

  • Boston: Despite a warmer-than-normal start to the winter, rodent populations are high and will seek shelter indoors throughout the cold winter months.
  • Detroit: Mild weather in January and February means ticks will be seeking hosts for a blood meal on days when the temperature exceeds 50 degrees or more.
  • Grand Rapids: A cold start to the winter increased pressure on rodents to seek shelter indoors, where they will remain. Warmer-than-average temperatures to finish out the winter will give ticks a head start on the spring season.
  • Harrisburg: Warmer-than-normal temperatures throughout the winter allowed tick populations to remain stable, which means more tick activity as weather warms in the late winter and early spring.
  • Indianapolis: Mild winter months equal larger proportions of overwintering tick populations surviving to spring. Beware of hungry ticks on warm winter and spring days.
  • Minneapolis: Cold temperatures drove rodents indoors early, but a relatively mild February will give tick populations a jumpstart on spring by increasing survivorship of overwintering ticks.
  • Miami: Warm and wet winter months are the perfect recipe for cockroach and mosquito populations to take off entering the spring.
  • New York: A milder than usual winter will result in more ticks being active on warm days in the late winter and early spring.
  • Pittsburgh: Lower-than-normal snowfall totals coupled with mild winter weather means more ticks and increased activity on mild winter and spring days.
  • Salt Lake City: Cooler-than-normal weather early in the season drove rodents indoors where they will stay despite milder temps in January and February.

¹ Listed in alphabetical order, no numeric ranking.

pest population
(Source: The National Pest Management Association)

“While a majority of the country observed mild conditions, a fair share of the U.S. did encounter significant snowfall and dry spells as well as below-average temperatures, securing their spot on our watchlist,” said Fredericks. “Dipping temperatures tend to drive rodents indoors, where they’ll find food and shelter to keep them busy until the spring weather rolls in.”

In addition to causing property damage, rodents are capable of spreading more than 35 diseases, including Salmonella and hantavirus, making it imperative to practice proper prevention to keep people protected. Mice and rats can squeeze through openings in a structure as small as the size of a dime and quarter, respectively.

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Read the full article "Top 10 Cities At Risk For A Pest Population Boom This Spring" on Facility Executive Magazine.

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