Welcome to Jefferson County


To learn more about working with cover cops in our area, this workshop will provide you inforamtion on cover crop options and how to effectively manage them as well as adapting your equipment. For more information about this workshop check out the online flyer or contact the Extension office at 636-797-5391.


Release of the URS Big River Watershed MASTER PLAN final is now available and online here.



   Spotted wing drosophila (SWD)

The SWD has been spotted in Jefferson County A new invasive insect pest is threatening Missouri fruit crops. Last year the spotted wing drosophila (SWD) hit berries and other small fruit crops across the state. To find out more information before this becomes a major problem for your local fruit crop production or home garden, contact the Extension office for information about making a trap to find out if this pest is in your area.

Emerald Ash Borer   Emerald Ash Borer (EAB)

The emerald ash borer (EAB) has been found in St. Charles County, marking the destructive insect’s first known infestation in the St. Louis area. Left unchecked, EAB is fatal for all three of the state’s native ash trees—blue, green and white ash. Pumpkin ash, a popular ornamental tree, is also susceptible. While mountain ash and prickly ash have “ash” in their name, they are not true ash trees and are not at risk. For more information about this destructive insect check out the University of Missouri Extension website: http://extension.missouri.edu/news/DisplayStory.aspx?N=2236 You can also find out more information on this and other invasive tree pests here: http://extension.missouri.edu/treepests/home.aspx 


Fire blight is caused by a bacterium, Erwinia amylovora. Rapid death of shoot tips occurs in spring. Leaves cling to a dead shoot which often has a rounded bend (or crook) at the end. Occasionally branch cankers occur. Both edible and ornamental pear varieties are susceptible although some resistance is present in certain varieties. In recent years fire blight symptoms have been observed on ornamental pear varieties formerly considered to be resistant. Severe pruning and excessive fertilization, which promote the rapid growth of succulent tissue, will also increase the vulnerability to fire blight. For more information about the correct way of pruning your trees to save them, check out this video from Nathan Brandt, UM Horticulture Specialist in St. Louis County.

Well owners need to regularly test their water

If you use well water for cooking and drinking, you should regularly test the water for contamination. For the complete story check out the University of Missouri Extension website: http://extension.missouri.edu/news/DisplayStory.aspx?N=2235

Food Safety

Test pressure canner gauges and prepare for home canning! Summer is here, which means it is time to get canning supplies and equipment checked and ready to use. It's also a good time to brush up on safe canning techniques. Contact the Extension office for information on canning complete with recipe ideas. Jefferson County Extension can check Presto brand canners and gauges - call the office at 636-797-5391 to set up a time to have your canner tested.

Salsa Workshop and Demonstration

Whether you've done home canning or it's been a while since you last canned food - these classes are for you! There is still 1 session left  this summer on August 13 - Preparing Salsa. For more information about the sessions and registration check out our Salsa Flyer (PDF)

Seasonal and Simple: A Guide for Enjoying Fresh Fruits and Vegetables

Seasonal and simple is a guide to help you select, store and prepare fresh fruits and vegetables. The recipes use simple preparations and seasonings, so you can taste the goodness of a fruit or vegetable at the peak of its flavor. The fruits and vegetables are listed in the guide by their growing season — spring, summer and fall. Nutrients and associated health benefits are listed with each fruit or  vegetable. For more information about purchasing this guide go to the guide information: http://www.extension.missouri.edu/p/MP909. Free app - Download the free Seasonal and Simple app for iPhone and Android, and your premium guide to finding, selecting, preparing and storing fresh fruits and vegetables in Missouri will be right in the palm of your hand.

Plant Diagnostics Clinic Reopens

The University of Missouri Plant Diagnostic Clinic was established in 1965 to provide answers to plant health questions. The clinic takes sample for diagnosis throughout Missouri. They welcome sample submissions to help determine plant health issues and will help track disease or threatening pest locations and noxious weeds. For more information on what can be tested and submission forms and fees check out the MU IPM Program website. You may also bring your samples to the Extension office and we submit the form and plant for you.

Spring Storm Preparedness and Recovery Information

EMERGENCY PREPAREDNESS - The Jefferson County Extension office has compiled a book of information, provided by the American Red Cross, to help you plan before a disaster strikes. Topics include weather related emergency information as well as info on all types of hazards. Learn what you need to do for power outages, heat waves, flu and poisoning. Find out what you should have in a disaster supply kit, learn what needs to be considered for children, disabled persons & seniors and find out how to make a family disaster plan. Contact the Extension office for a copy of the book or you can go online to the American Red Cross website at: http://www.redcross.org/prepare/disaster for individual topics and more information for you and your family.

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