Tree Fruits

Green PawPaw fruit on tree

Pawpaw fruit ripening

North America’s largest native tree fruit is ripening in forest understories and home landscapes across central Illinois this week. Pawpaws (Asimina triloba) are an often-unknown fruit tree to many folks, but they offer a delicious, exotic taste that seems more like a tropical fruit...
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Fire blight is a rapidly spreading bacteria disease often characterized by rapidly dying shoots that turn black or brown and bend into a shepherds crook shape.

Fire blight

In Illinois, we are very fortunate to have the ability to grow multiple tree fruit crops in our climate. However, we do have quite a few insect and disease challenges to address when reaching for that perfect apple or pear. On a recent trip to the Pacific Northwest region, I was in awe of...
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This pin oak tree tested positive for bacterial leaf scorch and displays the most distinctive symptoms characterized by brown leaf margins, a colorful band and green tissue along leaf veins.

Bacterial Leaf Scorch Infecting Illinois Oaks

Shade trees are some of the most valuable plants in most urban landscapes.  They provide energy saving shade as well as valuable habitat for wildlife in a sometimes otherwise inhospitable built environments.  However, a mature shade tree takes considerable time to develop the canopy and...
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a black walnut tree

Black Walnut

Anyone with a mature black walnut (Juglans nigra) on their property is likely aware that fruits are ripe now, and the baseball-sized, green bombs are beginning to fall with each slight gust of wind or, at times, seemingly at random. This native tree is prevalent throughout central...
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Pawpaw

Spring is a time of swelling buds and wildflowers in Illinois forests.  However, the flowering display of some plants may be overlooked if you aren’t observant.   The tiny, indiscrete flowers of pawpaw (Asimina triloba) are often unnoticed by humans since they appear in...
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