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by Tamra Reall (@MUExtBugNGarden) is a horticulture specialist for MU Extension – Urban West Region (Article used with permission from the Kansas City Gardener.) Get ready for a magical cicada spectacle this spring! Billions of buzzing insects from periodical cicada Broods XIII (13) and XIX (19) are emerging in April and May. Last seen together in 1803, they won't appear together again for another 221 years. In Missouri, we will just be seeing Brood XIX, while Brood XIII will be mostly in northern Illinois. I hope you will join the excitement, enjoy the rhythmic buzz, and marvel at nature’s spectacular show! What is the difference between periodical cicadas and the cicadas that come out every year? Periodical cicadas are like nature's timekeepers, following a mysterious, prime number schedule that scientists are still learning about. Having the longest life cycle in the insect world, periodical cicadas seem to magically appear together every 13 or 17 years. This is why their genus name is Magicicada! They spend most of their lives underground as nymphs feeding on the sap of tree roots. Then, as if waiting for the perfect moment, groups of Magicicada species, called a “brood,” emerge together all at once. These small, black cicadas with red eyes appear in such large numbers that they can cover trees. These clumsy fliers are easily captured by birds, squirrels, raccoons, and even dogs and cats. With so many emerging at the same time, many will survive to lay eggs for the next generation emerging in another 13 or 17 years later. Another fascinating feature of these insects is that the males sing together to attract females. In contrast, the large, green cicadas we see each summer have a shorter life cycle of 2-5 years and are known as annual or dog-day cicadas as some become adults every year. While these cicadas also sing in the trees, they give solo performances and do not synchronize like the periodical cicadas. Are periodical cicadas everywhere in the world? Although annual cicadas are found on every continent except Antarctica, periodical cicadas are only found in the eastern half of North America. Scientists do not know why they aren’t found anywhere else. There are four species of periodical cicadas in Brood XIX and these will emerge in Missouri, Indiana, Illinois, Kentucky, Maryland, Virginia, North Carolina, South Carolina, Arkansas, Oklahoma, Tennessee, Alabama, Georgia, Louisiana, and Mississippi. In Brood XIII, there are three species, and they are emerging in Illinois, Iowa, Indiana, Wisconsin, and possibly Michigan. Brood XIX, also known as the Great Southern Brood, emerges every 13 years, and Brood XIII (the Northern Illinois Brood) emerges every 17 years. 17-year broods tend to be in the northern states with cooler temperature zones, and 13-year broods tend to be in the warmer, southern states although there is a lot of overlap between 13- and 17-year broods. Why do cicadas shed their skin? Cicadas shed their skin to grow bigger. Like other insects, they have a hard outer covering called an exoskeleton. As they grow, their old exoskeleton becomes too small, so they shed it in a process called molting leaving behind old exuviae and growing new, larger exoskeletons. Do periodical cicadas hurt people, animals, or plants? Cicadas may land on people, but they won’t eat you – you don’t taste, feel, or smell right to them. That said, if one lands on you, gently brush it off, just in case the cicada is curious about what you might taste like! But, the cicadas can affect trees. Females lay their eggs in small twigs in trees. Large healthy trees aren’t harmed in the long term by this, although there may be dead twigs that fall after the cicadas are gone. Smaller trees can be damaged or even killed if not protected. Consider covering small, or newly planted, trees with a fine mesh material or cheesecloth to protect them during the 4-6 weeks the cicadas are out. Why do they make that loud sound? Males use a drum-like structure on their abdomen called tymbals to sing their loud, repetitive buzzing song, attracting female companions. A female will fly to the males and respond by quickly flicking her wings together if she likes his song. Periodical cicadas can be tricked by other vibrating sounds. They may be attracted to people mowing their lawns or using power tools. Periodical cicadas are loud! Because the males sing together, the buzzing sound can reach up to 100 decibels, which is as loud as a hair dryer, lawn mower, or a motorcycle. Consider wearing hearing protection if you will be outside for more than 15 minutes when the cicadas are singing to protect your hearing. What happens to cicadas after they mate and lay eggs? After mating, female cicadas lay their eggs in the branches of trees. They use a sharp ovipositor to make tiny slits in the bark, where they deposit their eggs. Males die soon after mating and females die after laying their eggs. A couple of weeks later, the eggs hatch and young cicada nymphs fall to the ground and burrow into the soil where they'll spend the next 13 or 17 years before starting the cycle all over again! ~~~~ Did you know that there is a Kids Ask Dr. Bug video series? Check it out! https://bit.ly/KADBvideos Do you have questions for Dr. Bug? Send them to https://bit.ly/KidsAskDrBug To help me learn what you learn from this column, or to share feedback, please consider filling out this survey: https://bit.ly/KidsAskDrBugSurvey Known for their red eyes, cicada eyes actually can be several colors. Photo courtesy of Gene Kritsky, Mount St. Joseph University
by Dr. Tamra Reall, University of Missouri Extension
There are yellow, orange, red ladybugs - are they all actually ladybugs? Yes, they are all part of the ladybug family! Ladybugs, also called ladybirds, belong to a big beetle family. Ladybugs are oval-shaped and can be yellow, orange, or red like what you have found. They can also be gray, black, brown, or even pink! Sometimes they have spots, but not always. So, if you see a little beetle with an oval body and different colors like yellow, orange, or red, it might just be a ladybug, even if it doesn’t have spots. Ladybugs come in lots of beautiful colors! Why can bugs and spiders live inside our house during winter, but there aren’t any insects outside in the cold? Think of our homes as cozy hideouts for insects and spiders during winter! Just like we find our houses warm and comfy, these critters seek refuge from the freezing cold outside. Those who come indoors may not be built to be active outside in the chilly temperatures, so they move inside where it's warm and there's food. Our homes offer refuge for them to stay snug until it gets warmer outside. You might be happy to know that not all arthropods can survive the winter indoors because our homes are usually too dry for them. Common arthropods that come inside are nonnative ladybugs, stink bugs, or spiders. If you find them indoors, you can gently scoop them up and release them back outside. Or you can use a vacuum. But watch out—some insects, like stink bugs, can give off a funky smell if vacuumed up! Also, after cleaning, remember to empty the vacuum and take out the trash to keep these uninvited guests from returning! How do insects survive when it gets so cold or warm in the same week? Insects are experts at handling changing weather. As fall and winter arrive, some insects enter a dormant stage called diapause, almost like hibernation, to prepare to survive harsh conditions. Many insects rely on light to let them know what season we are in, rather than the temperature because it can change so much during our winters. So, even if it warms up for a day or two, they will stay in their dormant stage. Other insects can adjust to the changing temperatures and emerge or become active as the weather is favorable. Still, others do not survive when it gets cold enough, so they die off for the winter. Then, either their offspring emerge in the spring, or others of their species migrate here from southern climates as the weather warms up here. Insect abilities to change behaviors, life stages, and even body functions help them handle changing weather without skipping a beat. How does climate change affect bugs? Climate change affects insects in some big ways. Because of their short lifespans, many insects are super adaptable, but even they struggle when things get too out of whack. With the changing weather patterns, insects might have to move around more to find food and the right conditions to live in. Unfortunately, some insects can end up causing problems by moving into new places where they shouldn't be, like invasive pests crashing in where they don't belong and eating plants we don’t want them to eat. Brown marmorated stink bugs and Japanese beetles are examples of invasive pests. You know how some insects and plants work together, such as bees and butterflies that pollinate flowers that create fruit? Well, the changing climate can affect that, too. Pollinators and their favorite flowers might not sync up like they used to, meaning flowers might bloom before the bees or butterflies have emerged to pollinate them. It's like they're playing different tunes in a band and it gets confusing! This is a big issue, and it will take a lot of cooperation between governments, corporations, and organizations. However, we can help! Planting more flowers is awesome because it gives pollinators more food and we get more beautiful flowers. Using IPM (that's Integrated Pest Management, a fancy term for controlling pest insects without using too many chemicals) is very helpful too for the survival of beneficial predators who capture pests, so we don’t have to. Turning off lights at night is good because it helps insects that rely on the stars, moon, or Milky Way at night to navigate. So, creating more bug-friendly places for insects to live is a win-win. We can make a difference by helping our arthropod friends adapt to a changing world! What's something strange about insects? One incredibly unusual thing about insects is their diversity in communication. While many insects use sounds to communicate, some have really unique methods. For instance, treehoppers communicate by vibrating stems, honey bees dance to tell their sisters where to find the best nectar and pollen, and fireflies use light to attract mates. Also, many insects use pheromones, which are like special perfumes, to signal danger, attract partners, or create trails to find food and their way home. Their communication methods are exceptionally diverse and fascinating, showing just how creative nature can be! Do you have questions for Dr. Bug? Send them to https://bit.ly/KidsAskDrBug To help me learn what you learn from this column, or to share feedback, please consider filling out this survey: https://bit.ly/KidsAskDrBugSurvey Did you know that there is a Kids Ask Dr. Bug video series? Check it out! https://bit.ly/KADBvideos |
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