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The American chestnut (Castanea dentata) was an iconic tree that is now functionally extinct. For a hundred years, researchers from multiple organizations have been working to restore this tree. A free online course – An Introduction to the American Chestnut – is now available. The course covers chestnut taxonomy, silvics, historical importance, ecology, and its demise. A second course in development will cover American chestnut restoration and management.

White-nose syndrome (WNS) has killed more than six million bats over the past decade. WNS is caused by the fungus Pseudogymnoascus destructans (Pd). Studies show that bats eat enough insect pests to save the U.S. corn industry more than $1 billion a year in crop damage and pesticide costs, and more than $3 billion per year to all agricultural production including forests.
 

To help fund the research needed to combat this deadly disease, the U.S. Fish and Wildlife Service announced $2.5 million in grants for research of high priority questions about WNS that will improve our ability to manage the disease and conserve affected bats.

Provides links and resources for State Health Departments, many of which have information about Zika virus and West Nile virus with specific state information.

Ash and elm trees play important roles in the U.S. economy, culture, and environment. In the eastern United States, elm (especially American elm) and ash trees are in trouble because of two threats: the emerald ash borer (an insect that attacks ash) and Dutch elm disease (caused by a fungus that sickens elms). These pests are causing ash and elm trees to die off quickly. Because elm and ash trees serve important ecological roles where they are found, the loss of these trees can lead to profound changes across urban and rural environments.

Foot-and-mouth disease (FMD) virus spreads much more aggressively in pigs than previous research suggests, according to a new study by U.S. Department of Agriculture (USDA) scientists. The study, recently published in Scientific Reports, shows that pigs infected with the FMD virus were highly contagious to other pigs just 24 hours after infection—long before showing any clinical signs of infection such as fever and blisters. Foot-and-mouth disease continues to be the most important foreign disease of livestock worldwide, said Jonathan Arzt, lead investigator and veterinary medical officer with USDA’s Agricultural Research Service (ARS). Although the United States has not had an FMD outbreak since 1929, this highly contagious viral disease, which is sometimes fatal, is still considered a serious threat to U.S. agriculture.

Laurel wilt has devastated plants in the Lauraceae family – redbay, sassafras, pondberry, avocado, and others – since it was first detected in the southeastern U.S. around 2002. There is no widespread, effective treatment for laurel wilt. Genetics research is focused on learning more about the pathogen's genetic structure in order to improve detection methods and screening for possible resistance in Lauraceae host species. "We have developed genetic markers to describe the population of the pathogen in the U.S.," says USDA Forest Service plant pathologist Tyler Dreaden. "Knowing which genotypes to use contributes to a quicker, more cost-effective resistance screening process." Dreaden led a new study to shed light on the genetic structure of the pathogen and its reproductive strategy. The research team included Marc Hughes at the University of Hawaii at Manoa, Randy Ploetz and Jason Smith at the University of Florida, and Adam Black, horticulture director of the Peckerwood Garden Conservation Foundation in Texas. Their findings were published in Forests.

See also: Common Disease Problems for more fact sheets

See also: Sudden Oak Death Forest Health Fact Sheet (Apr 2021) [PDF, 2.0 MB]

A guide for homeowners, small woodland owners, resource managers, and conservation groups to recognize, prevent, and manage Sudden Oak Death.

See also: Plant Industry Pest Alerts for more pests/diseases

Provides comprehensive sweet orange scab information including: what to look for, how to prevent this disease and how it is treated. Also provides image gallery and information how to report signs of citrus disease. And provides control information including: current status and regulatory information.