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See also: Emerging Aquatic Diseases and Issues for more resources

Thousand cankers disease (TCD) is a disease complex native to the western United States and primarily affects black walnut, Juglans nigra. This disease is the result of the combined activity of a fungus, Geosmithia morbida, and the walnut twig beetle WTB), Pityophthorus juglandis. On January 12, 2015, the the Maryland Secretary of Agriculture issued a quarantine order to minimize the risk of moving infested material out of the limited action area in Cecil County, and to provide confidence in Maryland walnut products moving into neighboring states from non quarantined areas. The 2015 quarantine order has been updated to include all of Baltimore City and part of Baltimore County [PDF, 1.2 MB]. The new quarantine [PDF, 1.0 MB] was signed on May 1, 2019 by the Maryland Secretary of Agriculture.

The Washington Invasive Species Council approved an updated statewide strategy to prevent invading plants and animals from taking hold in the state’s forests, waters and farms.

The strategy calls for a broad range of actions focusing on preventing new species from establishing here, educating the public and rapidly deploying when species are found to prevent their spread. The 5-year strategy (2020-2025) is available at Washington Invasive Species Council - Reports.

After three years without confirmed detections, the Washington State Department of Agriculture (WSDA) and the United States Department of Agriculture (USDA) have declared the northern giant hornet (Vespa mandarinia) eradicated from Washington and the United States.
See also: APHIS in Action: Victory Over the World's Largest Hornet Species (Dec 18, 2024) [usda.gov]

In summer 2019, a population of Palmer amaranth was identified in pumpkin fields in East Windsor, Hartford. This is the first report of Palmer amaranth in Connecticut.
See also: All Available Fact Sheets for more resources