When the Weather Warms, the Bee Swarms

When the Weather Warms, the Bee Swarms

A worker bee gathering nectar and pollen.

As the weather warms, it seems that all kinds of living things start stirring. From birds to bees, plants to ants, and gnats to tourists, the world comes alive in the spring. It’s those bees we’ll discuss here, because every year they swarm, and that can cause some consternation among the homeowners whose houses they invade.

Honeybees are vitally important to our wellbeing, as they act as pollinators for many of our crops. They supply us with honey and wax and are a source of livelihood for many individuals. Important though they may be, they can sometimes become a nuisance.

Honeybees are eusocial organisms. Each honeybee lives in a colony or hive that it cannot survive without. In fact, it can be helpful to think of the entire hive as a single organism, even if it is made up of many individuals. The queen bee is the only one who lays eggs, but she cannot forage for her own food. Workers supply pollen and nectar to the hive but cannot reproduce on their own. Drones, or male bees, exist only to mate and would quickly die without the support of their sisters.

When a queen reproduces, she lays eggs that develop into new workers. When the time is right, she may lay eggs that develop into drones, or new females may be fed a substance called royal jelly that causes them to develop into new queens. These new drones and queens are born in preparation for a new hive to be created rather than to add more bees to the existing one. The old queen will be the adventurous one, so the workers put her on a diet. Once she has lost weight (to make it easier for her to fly), she takes half the workers in the hive and goes out in search of a new place to live. One of the new queens, after mating, returns to the nest and prepares to continue the work of her predecessor.

When the old queen leaves with her coterie, this is called a swarm. When weather warms and nectar begins to flow, the

A swarm of bees looking for a new home.

bees travel from place to place looking for a good spot to live. Hollow cavities in trees are a favorite spot, but bee scouts often find what they think are perfect living places in our homes or sheds. While they are searching for a new place to set up shop, they may rest on trees or branches in large clumps. Do not be alarmed if you see one, as it does not mean they are nesting where they’ve stopped. Wait a while to see if they leave on their own or contact a local beekeeper to see if they want to collect the swarm.

If bees have taken up residence somewhere they’re not welcome, there are companies and individuals who may be able to collect the bees rather than destroying them. If removal is not an option, nuisance bees may be eradicated under Florida law, but this must be done by a certified Pest Control Operator.

If you have a swarm or hive on your property, check with the Department of Agriculture (Bee Removal or Eradication in Florida Resources) to find information and for a list of bee removal specialists. See our EDIS publication on choosing a pest control operator at Choosing the Right Pest Control Operator for Honey Bee Removal: A Consumer Guide. You can also contact your local Extension office for help with finding someone local.

Winter Watering Concerns

Winter Watering Concerns

Plants need water. This isn’t an outrageous insight, but the details behind this statement can be more complicated than it might seem. While it is true that plants, like all living things, need water to survive, they don’t all need the same amount and they may need more or less at different times. For a healthy landscape, garden, container planting, or lawn, it’s important to pay attention to the little quirks of watering that may not be immediately obvious.

During the wintertime, temperatures are lower and days are shorter. Less heat and sunlight means water will evaporate much more slowly and the soil will stay wetter. With less heat and sunlight, plants grow at a much slower rate (if at all). This means that irrigation systems set for summertime watering are probably going to keep conditions too damp for many plants during the winter. For example, a St. Augustinegrass lawn might only be able to survive 1 to 5 days without irrigation or rain in the summer, but the same lawn can last 8 to 28 days between waterings in the winter. Consider adjusting your irrigation system or watering schedule to account for seasonal differences. Remember also that a practiced eye can tell when a lawn needs water – folding or curled blades of grass, a dulling of color from bright green to bluish-gray, and footprints that remain in turf rather than springing back are signs of drought stress. Before these signs show up, it may not be necessary or beneficial to water.

Snails love moisture, and an abundance of them may be a sign of too much irrigation.

If plants are overwatered, they often show different signs of distress. Lawns may have more issues with fungal diseases or become patchy, which can let weeds begin to take over. Ornamental plants such as shrubs and trees might show signs of nutrient deficiency or begin to drop leaves, appearing sparse and unhealthy. You may notice an increase in moisture-loving pests as well, such as slugs or snails. Check for watering issues if you notice any of these symptoms.

Cooler weather can be a good time to get outside and do regular maintenance on irrigation systems and plantings. Replace or unclog malfunctioning nozzles, patch

Moisture held against the base of a tree by mulch can eventually damage the plant.

holes in water lines, and adjust irrigation heads that may no longer be pointed in the right direction. Prune back plants that have grown into irrigation sprinkler patterns and may disrupt even watering. Put in new or replacement plants and make any adjustments needed to their irrigation. Lastly, add mulch around plants. This can help retain soil moisture, even out changes in soil temperature, suppress weed growth, and add organic matter to the soil as mulch breaks down. Avoid piling mulch against the base of plants, however, or it will hold moisture against the plant and can promote the growth of molds and other fungi.

Improperly placed or calibrated sprinklers can cause problems.

For more information on watering, there is a wealth of knowledge online. The Florida Friendly Landscaping program has a lot to read on the topic: https://ffl.ifas.ufl.edu/handbook/Water_Efficiently_vSept09.pdf

The University of Florida EDIS publications cover many watering topics as well: https://edis.ifas.ufl.edu/topic_landscape_irrigation

And, as always, contact your local extension office for help as well!

Armyworms, a Voracious Plant Pest

A newly hatched armyworm –photo by Lyle Buss

With a population that never seems to quite disappear in North Florida, the armyworm is a caterpillar pest of many plants. There are four types found in our area: fall, southern, yellow-striped, and beet armyworms. The caterpillars pupate into moths, which breed roughly from April to December, but warmer weather may lead to them being sighted even in the middle of winter. Adult moths, which are relatively nondescript and gray-brown in appearance, lay masses of 100-200 eggs on plants. Young armyworms are tiny and very difficult to detect, often hiding during the brightest parts of the day.

A fall armyworm. –photo by J L Castner

The armyworm grows to a length of about 1 ¼ inches, taking about two weeks to reach its full size. The caterpillar builds a cocoon in the soil and pupates into a moth, living another one to three weeks. With its ability to eat a broad range of plants, this can lead to large populations of these insects in a relatively short time.

Armyworms seem to prefer eating grasses (especially Bermudagrass in lawns), but will chew on almost anything in their path. They have been observed eating citrus trees, tobacco, cotton, strawberries, and even weeds like pigweed and nutsedge. A hungry armyworm might even turn on its fellow caterpillars, eating them as well if they are too close. When large numbers of these pests are present, the damage they do to surrounding foliage can be stark. Young caterpillars may skeletonize leaves, while older larvae will make holes in leaves or defoliate plants fully.

Years with an abundance of wet or humid weather seem to help armyworms reproduce. Armyworms seem to be attracted to newly established turf, and heavy fertilization of turfgrass in late summer can also cause populations to build. Scout for them

A beet armyworm. –photo by Serena Robison

during cooler hours of the day, or when it is overcast or rainy. Mixing a tablespoon of dishwashing soap in a gallon of water and pouring it over a four-square foot area will cause insects to crawl to the surface – do this if damage is present and armyworms are suspected. For lawns, treatment at the first sight of damage may help, though a lawn may very well survive an attack by armyworms. If chemical control is necessary, there are numerous options. Products containing the active ingredients Bacillus thuringiensis, acephate, bifenthrin, carbaryl, permethrin, spinosad, and others have all been labeled for use on armyworms.

For more information, see our EDIS publication on fall armyworm at https://edis.ifas.ufl.edu/in255 or contact your local Extension office.

Pusley Control in Florida Turfgrass

Pusley Control in Florida Turfgrass

Florida pusley has a low, spreading habit.

Florida pusley and its relatives, Brazilian and large-flower pusley, are common sights in lawns and landscapes during the summer. These prolific and tenacious weeds are closely related species in the genus Richardia, in the Rubiaceae family which includes coffee, bedstraw, and the plant from which the emetic ipecac is derived. With their thick leaves, low and spreading growing habit, and bright white flowers, they can quickly take over bare spots in a lawn and become quite a nuisance.

Because bare spots are a magnet for pusley (and weeds in general), one method to help prevent this weed from becoming a problem is to ensure the turfgrass is as healthy as possible. Well established grass can outcompete many other competitors. Keeping a lawn in tip-top shape includes watering properly, mowing at the recommended height for the grass species and variety, fertilizing appropriately, and controlling pests and diseases in a timely fashion. This can take some work in North Florida’s hot, humid climate, but prevention is almost always easier than trying to cure a problem.

Florida pusley is quickly noticed as soon as it flowers. While some may find the flowers attractive, they set seeds swiftly and before you know it, the next generation of plants is ready to go. Surprisingly, they are also an important nectar plant for honeybees. If chemical control is warranted for an infestation, a pre-emergent herbicide may help. Timing is important for this, so keep an eye on the thermometer – pre-emergents should be applied in the spring (February or March) when temperatures reach 65-70 degrees Fahrenheit for four to five days in a row. Examples are products with active ingredients such as atrazine or pendimethalin, though atrazine should not be used on bermudagrass or bahiagrass.

For weed problems that are already established, there are post-emergent herbicides available. In bahia, bermuda, and zoysia, products containing 2,4-D (or mixtures, such as 2,4-D and dicamba) can work fairly well. These products may require two applications to adequately control pusley. Be aware that some herbicides are sold under trade names that may be confusing, such as Roundup for Southern Lawns, which is a mixture of 2,4-D and penoxsulam, and is labeled for use on bahia, bermuda, St. Augustine, and zoysia grasses . It does not contain glyphosate, and Roundup that DOES contain glyphosate will kill turfgrass as well as weeds. Check the active ingredients on the herbicide label.

In St. Augustine lawns, options are more limited. Homeowners with St. Augustine may want to consider contacting a lawn care company for help with pusley. The available herbicides that are labeled for use in this instance are either difficult to use or prohibitively expensive (The herbicide Celsius, for example, costs over $100 per 10 oz. bottle). Another chemical that is effective is metsulfuron, and while it can be used in bermuda and zoysia lawns as well, it comes with some serious difficulties. First and foremost, it can be taken up by the roots of plants and is NOT safe to use around trees or shrubs. Properly measuring the chemical is tricky, as it may take only a single ounce to treat a whole acre. Serious damage can be done to surrounding plants if it is mixed or used improperly, and as such it may be difficult to find at local stores.

Homeowners who choose an herbicide to control pusley or any weed should be aware that high temperatures during the Florida summer can cause chemicals to affect the grass as well. St. Augustine is especially prone to this, and some herbicides such as 2,4-D may affect grasses more when temperatures rise above 85-90 degrees Fahrenheit.

A closeup of Florida pusley flowers.

Treatment of pusley and weeds in general is most effective when the plants are young. Large pusley plants have deeper roots and may take more applications of herbicides to control effectively. Furthermore, of the pusley species that can be found in our area, large-flower pusley is more difficult to control and may be tolerant of some chemicals. For more information, contact your local Extension office.

-Evan Anderson, Walton County Horticulture Agent

Camouflaged Critters

Camouflaged Critters

Nature is full of examples of animals that use camouflage to protect themselves, and some of the best examples are found in the insect world. They may appear to be leaves, sticks, thorns, or flowers; there are insects that disguise themselves as snakes, bird poop, or other more dangerous insects. While many of these adaptations protect them from predators such as birds or spiders, they may also make it difficult to identify a bug that’s causing a problem in the garden!

There are several insect pests of plants that may not appear to be what they are at first glance. This can make frustrating to figure out what’s harming a plant, and identification is a very important first step in solving any problem. Here are some of the more common critters that wear disguises in our area, though.

The ants in this picture are attracted by the scale insects, which look like oval bumps on the stem of the plant.

Scale Insects vary in shape, but many of them appear to be simply another bump on the stem or leaf of a plant. They often form a waxy covering over their bodies and stay put, simply feeding in place on the juices within the plant. Ants may notice them, however, and are attracted to the sticky, sugary substance that they exude called honeydew. This honeydew drips onto other stems and leaves, and may grow sooty mold, a black or gray coating that might make one think the problem is fungus. Look for scale insects if you notice these signs (and be aware that other insects such as aphids or mealybugs also produce honeydew).

 

Some psyllids or immature planthoppers cover themselves in white fuzz as protection.

 

Psyllids, mealybugs, and aphids are all different insects, but some species of each use a waxy coating to protect themselves. This gives them a white, fuzzy appearance that may appear at first glance to be a fungal growth. A close look can reveal the truth – that the fuzz is hiding a plant pest within.

 

Planthoppers and sharpshooters can be pests of certain plants, including grapes. They may appear to be bumps or thorns on a stem, but usually move or jump if approached.

Caterpillars may disguise themselves in a number of ways. Some may blend in with the foliage that surrounds them, while others appear to be twigs or even the aforementioned bird poop (in the case of the giant swallowtail butterfly, whose larvae enjoy feeding on citrus leaves). It is typically the damage to the plant that is first noticeable. Unlike the other insects mentioned here which feed by piercing into a plant and sucking out the juices, caterpillars have chewing mouthparts. Leaves with holes in them are a good sign that you might have a caterpillar problem.

Remember that not every insect is a pest, and not all pests do enough damage to warrant controlling them. If you need help determining if an insect you’ve seen in your garden or landscape is a problem, contact your local Extension office. You can also find more information on all of these insects and more in our EDIS publications, a few of which are listed below:

Scale insects: https://edis.ifas.ufl.edu/pdffiles/MG/MG00500.pdf

Mealybugs: https://edis.ifas.ufl.edu/in1149

Caterpillars: https://edis.ifas.ufl.edu/topic_landscape_caterpillar_pests

by Evan Anderson, Walton County Horticulture Agent