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Insect Pests

Brown leaves hanging off an oak tree that were damaged by cicadas

How to identify cicada damage on trees

The signs of this year’s historic cicada hatch are still around, although all of our periodic cicadas are now quietly underground, feeding away on tree roots for the next 13 years.  After piles of molted shells and dead adult cicadas earlier in the summer, we are now seeing their signature on...
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Magnolia scale on a magnolia tree.

Managing Magnolia Scale

Magnolias are some of the most popular ornamental trees across the US.  Known for spectacular flowering displays, they come in various shapes and sizes, from smaller shrub-sized plants to medium-sized shade trees.For the most part, these trees are usually a pretty safe bet in Illinois gardens...
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A spotted lanternfly on a red flower.

Spotted lanternfly spotted in Illinois

Invasive species are putting continual pressure on plants and animals in Illinois, which is only expected to intensify in the coming years.  This means we all need to be vigilant for new threats and aware of their impact when new invasives arrive. Last month, experts confirmed the arrival a...
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A ripe tomato on a tomato plant.

Tomato Problems and Solutions

Tomatoes are one of the most planted garden crops in the US and remain a staple of most vegetable gardens across central Illinois. Illinois Extension receives many questions about these plants and their care each year, with most questions centering on controlling some common ailments.  From...
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Sick tree

Using Phenology for Ornamental Pest Control

The timing of spring can vary each year based on weather, but there are always ques in nature that line up in similar fashion year after year.  While climatic conditions on exact calendar dates my vary, the sequence of emerging biota is consistent and based a long evolutionary history which...
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stacked firewood

Invasive species hitchhike on firewood

Nothing beats the warmth of a crackling fireplace on these coldest days of the year.  Each winter, as my family enjoys the cozy warmth of our woodstove room, I’m always thankful for the firewood supply we’ve been fortunate enough to accumulate over the past season. I enjoy the process of...
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A mature American elm at Morton Arboretum in Lisle, IL

Breeding elms to combat Dutch elm disease

Over this past week, the fall weather has brought bare branches to the previously color-filled canopies of so many trees in the landscape.  As the autumn leaf drop has progressed, there are several elm trees that I pass each day which have held onto their fall color and really look spectacular...
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Common milkweed in bloom

Aphids on Milkweed

Many gardeners are starting to integrate more and more milkweed into their landscaping in support of monarch butterflies.  Plants in the milkweed genius (Asclepius) are the exclusive food source for monarch caterpillars, making them incredibly important in the race to sustain...
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