Invasive Species

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Person dumping a white bucket of water outside.
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Drain After Rain to Prevent Mosquitoes

February 20th, 2025
By Lauren Fordyce
Recent rainfall throughout much of California has created puddles and stagnant water. With the temperature warming up in many parts of the state, this combination can create the perfect situation for mosquitoes to breed. We encourage you to drain after the rain to reduce mosquito-breeding sites.
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Figure 1. Metal art structure in transit to California. Photo credit: Sonoma County Dept of Agriculture/W&M
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Spotted Lanternfly: The Need to Remain Vigilant (Part 1)

November 19th, 2024
By Cindy Kron
On March 27th, 2024, a flatbed truck carrying a metal art structure originating in New York and headed to Petaluma, California was stopped at the California Department of Food and Agriculture (CDFA) Agricultural Inspection Station in Truckee, California due to live spotted lanternfly (SLF) egg masse...
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A brown and yellow fly on a yellow-green background.
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Invasive Pest Spotlight: Mediterranean Fruit Fly

November 6th, 2024
By Cherie Shook
The invasive pest spotlight focuses on emerging or potential invasive pests in California. In this issue we are covering the Mediterranean fruit fly. Mediterranean Fruit Fly Facts The Mediterranean fruit fly, Ceratitis capitata, commonly called Medfly, attacks more than 260 different plant species.
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A long, speckled brown insect with a pointed head on a green leaf.
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What are exotic and invasive pests?

July 16th, 2024
By Belinda Messenger-Sikes
Exotic and invasive pests threaten California's natural environments, agricultural production, structures, landscapes and gardens. Exotic pests are organisms introduced into an area beyond their natural range and become pests in the new environment.
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Buy it where you burn it!
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Don’t Move Firewood!

July 1st, 2024
By Lauren Fordyce
What you do with firewood this upcoming 4th of July (and year-round!) can impact more than just the s'mores on your campfire. If you move firewood around the state, you could spread deadly plant diseases and invasive insects. Don't take firewood with you if you travel or camp this holiday weekend.
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A brown insect on a green leaf.
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Invasive Pest Spotlight: Glassy-winged Sharpshooter

June 6th, 2024
By Lauren Fordyce
The glassy-winged sharpshooter is a large leafhopper that can transmit several important, often fatal, plant diseases in California. This includes Pierce's disease of grape, alfalfa dwarf, almond leaf scorch, and mulberry leaf scorch.
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A hand holding a dark green aquatic plant.
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Invasive Pest Spotlight: Hydrilla

June 5th, 2024
By Lauren Fordyce
Hydrilla (Hydrilla verticillata) is an invasive, aquatic weed that can be found in many slow-moving fresh water bodies in California. The plant forms large mats that can crowd out native plants, restrict water flow, and interfere with boating and fishing.
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Black and white striped mosquito on human skin
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Invasive Pest Spotlight: Aedes Mosquitoes

June 4th, 2024
By Lauren Fordyce
Aedes mosquitoes can transmit some of the most debilitating and deadly mosquito-borne pathogens to humans, such as Zika virus, dengue virus, chikungunya virus, and yellow fever virus. One Aedes species is also capable of transmitting heartworm to dogs.
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