Diseases, Pathogens, & Pests

The 411 on Spotted Lanternfly (November 2021)

Spotted lanternfly has been in the news lately for its threat to agricultural commodities. In terms of the spotted lanternfly’s threat to turf and ornamental plantings, experts say it’s more of a nuisance. So far, spotted lanternfly has been found in the Mid-Atlantic region and some Midwestern states. When lanternflies feed, the adults secrete a sticky substance called honeydew.  Read More

Spotted Lanternfly Found in Indiana (July 2021)

Spotted lanternfly (Lycorma delicatula) was found in Indiana for the first time in Switzerland County earlier this week, the farthest west the insect has been found. This federally regulated invasive species has a detrimental impact upon plant growth and fruit production, especially in vineyards and orchards. Read More

Illinois Forest Health Highlights - 2020

2020 was a challenging year for everyone, but fortunately our team was able to continue visiting state parks and natural areas for forest health monitoring (with extra precautions). Overall, the 2020 growing season was less active for forest health issues than previous years, although a number of pests and diseases continued to be seen. Continuing statewide issues included possible herbicide injury to oak and other hardwood tree species, decline of spruces and pines, rapid mortality of white oaks, and the usual foliar leaf diseases...Read More

APHIS Changes Approach to Fight the Emerald Ash Borer

The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) is changing its approach to fight the emerald ash borer (EAB) infestation that has spread through much of the United States. Announced via press release, the agency is publishing a final rule that removes the federal domestic EAB quarantine regulations that have proved ineffective and will redirect resources to more promising methods. Read More

Spotted Lanternfly Discovered in Oregon

According to the state’s department of agriculture, the spotted lanternfly has been discovered in the in Oregon. The Oregon Department of Agriculture released the following pest alert: A spotted lanternfly (SLF), Lycorma delicatula, was found in Oregon for the first time in October 2020 in a shipment of planters and ceramic pots from Pennsylvania. The female specimen was dead and dry. SLF was first found in North America...Read More

Pesticide Use & Regulation in Illinois

We are governed by the Illinois Pesticide Act (415 ILCS 60) which recognizes that "pesticides are valuable and necessary to Illinois' agricultural production and to the protection of man and his environment from pests, but it is essential to our general health and welfare that they be regulated to prevent adverse effects on man and his environment." 

Individuals wishing to purchase and/or apply restricted use pesticides in Illinois are required to successfully complete a competency examination and receive a license from the Illinois Department of Agriculture. LEARN MORE

Turf Management Tool - Product Efficacy Against Specific Pests

Search for a particular herbicide, fungicide, or insecticide by typing the product name into the search bar at the top of the page to learn more about that product.  Or to learn more information about product ratings against particular pests you can click on the diseases, insects, or weeds button on the home page, click on a particular pest, and find the products rated as most effective against that particular pest on a 1 to 4 scale (4 being the best).  

Click here to access the tool

Bayer Introduces New Spanish Pest Identification Guide for Greenhouses and Nurseries (July 2020)

The Environmental Science business of Bayer, part of the company’s Crop Science division, has created a new Spanish Pest Identification Guide to effectively communicate important technical information about pests to Spanish-speaking laborers in greenhouse and nursery operations. Digital versions of the guide — in both Spanish and English — can be viewed, printed or downloaded for free...Read More

Boxwood Blight

Emerald Ash Borer

Updated Guide to Chemical Control of Emerald Ash Borer - CLICK HERE

What is Emerald Ash Borer - CLICK HERE
Insecticide Options for Protecting Ash Trees from Emerald Ash Borer - CLICK HERE
New Tips for Managing Emerald Ash Borer - CLICK HERE

Box Tree Moth

Box tree moth (Cydalima perspectalis) is considered a high-consequence defoliating pest of boxwood, with other possible hosts. Box tree moth (BTM) is a Eurasian native moth. The larvae are voracious defoliators of Buxus. The pest is established in western Europe, where it has been extremely damaging to boxwood in the landscape. Roughly two years ago, it was found in an urban Toronto neighborhood. In May 2021, the Canadian Food Inspection Agency (CFIA) confirmed the presence of box tree moth (Cydalima perspectalis) in a St. Catharines, Ontario, Canada nursery. On May 26, 2021, USDA imposed a federal order prohibiting the importation of all Buxus, Ilex, and Euonymus spp.plants from anywhere in Canada until further notice. 

Box Tree Moth Resources
Horticultural Research Institute Webinar on Box Tree Moth - CLICK HERE
Insecticide Options for Box Tree Moth Management - CLICK HERE
Photographic Guide of Boxwood Pests & Diseases - CLICK HERE
ox Tree Moth Management Practices for Growers -

Japanese Beetle

Following a series of regulatory incidents in 2017, the state of Colorado is apparently moving to tighten requirements for some incoming shipments of container-grown plants.  In rule changes that will take effect April 15, 2018 if approved as expected, container-grown plants in pots up to 16 inches in diameter will continue to be able to be certified and shipped under the Japanese Beetle Harmonization Plan’s Container Accreditation option.  However, nurseries not producing consistent with that option will need to use an approved insecticide dip or drench treatment for any containers larger than 7 inches in diameter or of a volume classified in the American Standard for Nursery Stock as a trade #1 or larger. The requirement will apply to incoming plants from Japanese beetle-infested areas, and also to Colorado-grown plants moving out of areas declared infested in the state. 

Spotted Lanternfly

 This plant hopper feeds on a wide range of plants and trees. It is a serious threat to grape, apple, oak, walnut, poplar, stone fruit and logging industries. Grapes, orchard fruits, hops, and trees are most at risk. It is native to China and was first detected in Pennsylvania in September 2014. Spotted lanternfly feeds on a wide range of fruit, ornamental and woody trees, with tree-of-heaven being one of the preferred hosts.


Brian Walsh, Penn State Extension Horticulture Educator based in Berks County, Pennsylvania, discusses the latest SLF management research on insecticide trials and treatment recommendations during a Horticultural Research Institute THRIVE Webinar - WATCH NOW

Management of Invasive Plants and Pests of Illinois

Illinois Designated Exotic Weeds List (525 ILCS 10/) Illinois Exotic Weed Act - It shall be unlawful for any person, corporation, political subdivision, agency or department of the State to buy, sell, offer for sale, distribute or plant seeds, plants or plant parts of exotic weeds without a permit issued by the Department of Natural Resources. CLICK HERE TO ACCESS LIST

Illinois Designated Noxious Weeds List - CLICK HERE

University of Illinois Extension Guide to Identifying Exotic Weeds - CLICK HERE

How to Identify Common Invasive Plants (Videos from The Morton Arboretum)