As the days get shorter and the temperatures get cooler, many species of insects will search for places to spend the winter. Depending on the insect, they may seek out a variety of locations, such as in soil, under leaf litter, under tree bark, or even in our homes. One that we commonly...

Despite the bad name they get, yellowjackets (Vespula spp.) are beneficial insects. The larvae are meat eaters, consuming caterpillars and other insects (and occasionally carrion) that adults have captured and brought back to the nest. Adults, on the other hand, primarily feed on flower...

You sprayed what? Where? There are a few occasions when it is a good thing people can’t read my facial expressions over the phone. One of those situations is when I get a phone call where someone has used a pesticide that is way off-label. By off-label, I am referring to spraying a pesticide...

Magnolias are popular trees and shrubs in many landscapes. Their large, showy flowers can range from white to pink to yellow and provide a burst of color in the spring. While they are relatively pest-free, one of the biggest pests is the magnolia scale (Neolecanium cornuparvum), which...

Roses are grown in many gardens for their large, showy, often fragrant flowers. If you grow roses, you may have noticed something eating the leaves of your plants, causing them to become unsightly. While Japanese beetles often get much of the blame during the summer months, they aren’t the only...

With the arrival of fall, many of us will be heading outdoors for various activities, from visiting the local pumpkin patch or apple orchard, attending football games, or enjoying fall colors. People aren’t the only thing on the move, though. As the weather gets colder and the days get shorter,...

Lady beetles are widely considered a gardener’s friend. Sure, multi-colored Asian lady beetles can be a nuisance when they make their way into our homes during the fall (not to mention displacing native lady beetles). But they are all predatory, beneficial insects that feed on various pest insects...

Peonies are a common sight in many yards. They are typically grown for their showy blooms in the spring but also have attractive foliage that can act as a backdrop in landscape beds. While peonies are relatively problem-free, a few diseases, powdery mildew and leaf blotch, show up fairly regularly...

Hollyhocks (Alcea rosea) have been growing in gardens for centuries and remind many of us of our parents’ or grandparents’ gardens. Despite being ‘old-fashioned,’ hollyhocks have had a bit of a resurgence in recent years. Their tall, stately flowers are an impressive sight in the garden....

Apples and pears are popular trees to grow for people interested in growing their own fruit. However, they aren't without any problems. A variety of insect pests and diseases can plague them. One common and potentially serious disease is fire blight. What is fire blight? Fire...

Most people are familiar with praying mantids. These large predatory insects are a common sight in the fall, and we often encounter their egg cases (ootheca) this time of year too. But did you know that three different species of praying mantids, the native Carolina mantid and the introduced...

As we transition from summer to fall and the temperatures start cooling off, many of us will be spending more time outdoors. While enjoying our time outdoors, we often encounter various insets we may not have seen or noticed earlier in the growing season. One such insect is the unusual, and to some...

As we draw nearer to fall, it's time to start thinking about bringing houseplants back indoors for the winter. Many houseplants are native to tropical and subtropical climates and, while they may do great outdoors during the summer, cannot tolerate our cold temperatures. When the thermometer starts...

Spider mites are a common pest on many types of plants. The most commonly encountered species is the twospotted spider mite (Tetranychus urticae). While we often think of them ...

Have you ever gone out to pick a peach only to find they have a large brown, mushy spot? Or perhaps you've brought some peaches home from the farmers' market only to have developed these same spots a few days later. The likely culprit is brown rot. Brown rot (Monilinia spp.) is one of the...

There are a variety of insects that will feed on squash. One of the more troublesome, and potentially devastating, is the squash vine borer. If you've grown squash and had a runner or two start wilting, there's a good chance you've had an encounter with squash vine borer. Squash vine borers (...

We often don’t think much about insect pests outside of the occasional pantry pest or accidental invader during the winter months. Despite it being the middle of winter, that doesn’t...

Once you’ve picked the last of your fruits this season, you may think your work with your fruit plants is over. However, a few tasks can be done in the fall to set yourself up for a successful growing season next year. Tree Fruit Sanitation and disease management One of the most...

While it may seem like every insect out there is trying to eat your plants, not all the insects you see in your garden are pests. In fact, fewer than 1% of all insects are considered pests, meaning the vast majority are beneficial or, at the very least, benign. While most people are aware of the...

It’s that time of year - time to start thinking about pruning your deciduous trees. Most deciduous trees are best pruned while they are in full dormancy. This happens to be January to early March for this...

Wasps have an undeserved bad reputation. While some species can be a tad on the aggressive side, they are, as a whole, rather beneficial. Admittedly they can be intimidating insects, particularly large ones. In 2020, Extension received more reports about large wasps than usual. Perhaps it’s...

We’re at a point in the growing season where it is still a little early for soybeans to start senescing and turn yellow (dependent on maturity group, planting date, and growing conditions), so it makes you question why are yellow soybeans appearing in fields? There are several factors that can...

Several different types of caterpillars will feed on tomatoes. The most well-known, and probably most dreaded, are the tomato (Manduca quinquemaculata) and tobacco (Manduca sexta) hornworms. These large (up to 4 inches long) green caterpillars have a prominent “horn” on their rear...

Cucumbers, melons, squash, and pumpkins are collectively known as cucurbits. Because these crops are related, they are afflicted with many of the same pests and diseases. Here are some of the most commonly encountered pests and diseases in cucurbits. Insects Cucumber...

Tomatoes are the most commonly grown plant in the home vegetable garden. Tomatoes are relatively easy to grow, and there is a wide variety of different types. If you’re growing tomatoes, you’ll more than likely encounter a few pests and diseases along the way. So, let’s take a moment and talk about...

As the saying goes, the only things guaranteed in life are death and taxes. If you’re a gardener, you can also include pests to the list of life’s guarantees. Now that it's started to warm up enough to get out and plant the garden, it also means it’s warm enough for weeds, insects, and diseases to...

In 2015, I was interviewed for an article in an Associated Press story. The topic was on biodiversity in the home landscape. While a few snippets of my interview made it into the article, I provided over 1,500 words worth of answers to the journalist’s questions. Now after five years, this...

Tomatoes are one of the most commonly grown vegetables in home gardens. While tomatoes are relatively easy to grow there are a few diseases you should keep your eye out for. Two of the most common diseases people encounter are early blight and Septoria leaf spot. Both of these diseases are caused...

It's about that time of year, time for Japanese beetles... Japanese beetles are one of the most destructive ornamental pests we have in Illinois. They were first discovered in the United States in 1916 in New Jersey and have been making their way across the U.S. since then. The adults are about a...

If you've ever grown squash or pumpkins (or other cucurbits, like cucumbers) then you've likely encountered squash bugs. Squash bug (Asasa tristis) adults are brownish-black and about 5/8 of an inch long. The adults will overwinter in protected areas (under plant debris, around buildings,...

I've been seeing mosquitoes and ticks for several weeks already, and as the weather gets warmer they'll get more numerous. Not only are these critters annoying, many are also capable of transmitting a variety of diseases. There are three main types of mosquitoes. The permanent pool mosquitoes,...

Warm weather has arrived, and our plants are starting to green-up and bloom. That also means weeds, insects, and diseases are starting to become active too. As the saying goes, the only things guaranteed in life are death and taxes, and if you're a gardener, you can also include pests in the list...