Keeping an Eye Out for African Swine Fever 

Keeping an Eye Out for African Swine Fever 

Despite efforts by public and private land managers, feral hog populations continue to rise in many areas in Florida.  Feral hogs damage crop fields, lawns, wetlands, and forests.  They can negatively impact native species of plants and animals.  Their rooting leads to erosion and decreased water quality.  Feral swine can also harbor and infect domestic swine with diseases such as African Swine Fever, foot-and-mouth disease, pseudorabies, swine brucellosis, and others.  

USDA APHIS conducts feral swine monitoring for diseases to help safeguard our pork production here in the US.  More than 6,000 samples are taken annually to test for diseases of concern.  This monitoring effort not only keeps our domestic swine safe but also keeps humans safe from diseases that can infect us.  African Swine Fever (ASF) is the main disease of concern right now for the state of Florida, especially those counties bordering the Gulf of Mexico. 

ASF is a deadly disease of both feral and domestic hogs.  It is not transmitted to humans so it is not a health or food safety concern.  It is, however, highly contagious and would likely have a catastrophic effect on our domestic pork industry.  Although it has not been found in the US, this disease has recently been detected in the Dominican Republic and Haiti. 

This concern has led to a new monitoring program in Florida specifically for ASF in counties bordering the Gulf.  USDA APHIS will begin trapping wild hogs in these counties in order to monitor populations for ASF.  Landowners, both public and private, can benefit from this monitoring program.  Professional trappers will be employed to remove wild hogs for this monitoring effort.  For more information on this program, contact Buddy Welch, North Florida Assistant District Supervisor, USDA Wildlife Services, ASF Surveillance at edgar.welch@usda.gov

Dealing with the Armadillo

Dealing with the Armadillo

Florida has a love-hate relationship with this animal.  Some find them cute and adorable, others find them a pest and a nuisance, either way there is no ignoring this guy.  They are everywhere and yes – they can make a mess of your lawn and garden.  So, for those who are not so in love with the creature – what can be done? 

Let’s first meet the animal. 

There are about 20 species of armadillo found in Central and South America but there is only one in the U.S., the Nine-Banded Armadillo (Dasypus novemcinctus).  The Nine-Banded Armadillo is originally from South America and there were several different species of armadillos that made the trek from South to North America prior to the ice age.  But after the ice age it seemed no armadillos were present in the U.S.  After the ice age, the Nine-Banded Armadillo expanded north into Mexico, but it seems could not cross the Rio Grande.  That is until Americans began to settle the area.  Prior to American settlement, armadillos were hunted for food, and the land on both sides of the river was regularly burned.  The American settlers ceased the burning and the Native Americans declined in numbers, so hunting pressure declined as well.  Many armadillos were probably brought across intentionally, but others who managed to swim across, and armadillos can swim, now found suitable habitat with the decreased burning.  They had arrived and began expanding both east and west across the southern U.S.  However, the Mississippi River presented another barrier they could not deal with. 

The common nine banded armadillo scurrying across the lawn. Photo: Les Harrison

The introduction in Florida was a different story.  Apparently in the 1920s and 30s they were released by humans.  One release appeared to be an escape from a small zoo.  Another was from a circus.  There are reports of armadillos riding cattle cars on trains from the west and this allowed them to cross the Mississippi.  In the 1920s bridges were built across the river for a new invention called the automobile.  All of this led to the invasion and the animals are now here, they are also expanding north. 

Armadillos like warm/wet climates.  They prefer forested areas or grasslands and, again, can swim small rivers and creeks easily.  It has been reported they can hold their breath up to six minutes and have been seen literally walking along creek bottoms. 

They feed primarily on a variety of small invertebrates such as grubs, snails, beetles, and even cockroaches (many of you will like that).  They like to feed in wet areas or loose sandy soils where digging is easier.  Unfortunately, your lawn is a good place to hunt.  They rarely, but do, feed on small reptiles and amphibians and eggs. 

They breed in the summer but delay egg implantation so that birth is in the spring.  They typically give birth to quadruplets.  The armor of the young is not hard at first but hardens over time and does provide protection from large predators like panthers, bears, and alligators.  They typically live 12-15 years, but some have reached the age of 20. 

So… now you know the animal… for those who do not want them, what can be done?

Based on an article from UF IFAS Extension, not a lot.  Typical methods of deterring wildlife have not worked.  Poisons, smells, and even using firearms has not relieved the homeowner of the problem.  One study looked at trapping and found that in general it is hard to get them to enter.  In this study they caught one armadillo every 132 trap nights – low percentages.  Another study looked at baits and found crickets and worms worked best, but the smell of other armadillos in the trap also lured them.  One colleague mentioned the need for solid wood traps and he baits them with nothing but the shells of roadkill as had good success.  He mentioned the designs of these wooden traps are online.  You can get plans to build them, and you can also purchase pre-made ones.  Once captured they can be relocated but the trapper should be aware that armadillos have many peg-like teeth and very sharp claws for digging.  HANDLE WITH CARE.  It is also known that armadillos can carry leprosy, though cases of leprosy being transmitted to humans are rare.  None the less, handle with care. 

For more information on this animal, contact your county extension office. 

Chiggers

Chiggers

Chiggers, also known as ‘red bugs’ are the larvae of mites in the family Trombiculidae. If you’ve ever got an infestation after being in the woods, you’re familiar with the intense itching and reddish welts they cause. In some parts of the world, they are able to transmit scrub typhus, but luckily for us in Florida, they aren’t known to transmit human diseases.

Microscope view of a chigger. Credit: UF/IFAS.

The life cycle of chiggers consist of an egg, prelarva, larva, nymph and adult. The female will lay her eggs in a sheltered area and the egg will hatch into the prelarva. This is a non-feeding stage. The larva stage is the parasitic stage that feeds on animals and humans, although humans are not their preferred host. During this life cycle stage, they will feed on anything from small mammals to birds, reptiles, and amphibians. You’ll find chiggers in damp, low areas where brush is heavy.

Chiggers use their piercing sucking mouthparts to suck fluids from the skin. After three days of feeding, the larva drops to the ground and transforms into the nymphal stage. The nymph and adult stage have eight legs. The entire life cycle can require two months to one year, depending on temperature, moisture and location.

When chiggers feed on humans, they attach themselves to the skin, hair follicles or pores with their piercing sucking mouthparts. When attached, they are generally not noticed for some time and itching from chigger bites is usually not noticed for four to eight hours after they have been attached or removed. While feeding, they inject a fluid into the skin that dissolves tissue. This fluid injection causes the welts to appear which can last up to two weeks. Contrary to popular belief, chiggers do not actually burrow into the skin and the welts do not contain them.

Chigger bites. Photo credit: Wayne Mitzen, UF/IFAS.

Chiggers can be removed from the skin by taking a hot shower or bath and lathering with soap. Since the symptoms of chigger bites do not appear for several hours after a bite, it is not always possible to prevent welts caused by bites. If welts appear, antiseptic should be used. Temporary itching relief may be achieved by using anesthetics available at the drug store.

If you’re going into areas that may be infested with chiggers, wear protective clothing and use repellents containing DEET. Be sure to apply them to the legs, ankles, cuffs, waist, and sleeves of clothing. Be sure to always follow the label. For more information on chiggers, contact your local UF/IFAS Extension Office.

For more information, please visit:

UF/IFAS Chiggers 

Wait, Wasps are Good Guys?

Wait, Wasps are Good Guys?

Yes, wasps are definitely good guys. Wasps are beneficial insects that feed on other insects, by destroying many harmful bugs that attack our landscape ornamentals and home vegetable gardens. However, they tend not to be very friendly to us, when we encroach on their territory. In other words, we really don’t want them to be close neighbors.

There are five members of the wasp family commonly encountered in Florida. These are hornets (Vespa spp.), yellow jackets (Vespula spp.), paper wasps (Polistes spp.), mud or dirt daubers (Sphecidae spp.), and cicada killers (Specius speciosus). Hornets, yellow jackets, and paper wasps are likely to sting if you go near or disrupt their nests. Mud daubers and cicada killers usually will not sting, unless you touch them.

Photo: Clockwise from top left: Hornet, Yellow Jacket, Paper Wasp, Mud Dauber and Cicada Killer.

Credit: P. G. Koehler and J. L. Castner, UF/IFAS Extension, Department of Entomology and Nematology.

There are parasitoid wasps, such as Tamarixia radiata, that are very beneficial, if you are a citrus grower. This native species is a biological control method for the Asian citrus psyllid, which is the vector for the devastating citrus greening disease. If you are interested in releasing juvenile Tamarixia radiata on your property please visit the Florida Department of Agriculture and Consumer Services website for an application: https://www.fdacs.gov/Divisions-Offices/Plant-Industry/Bureaus-and-Services/Methods-Development-Biological-Control/Biological-Control/Asian-Citrus-Psyllid-Biological-Control/Biological-Control-of-Asian-Citrus-Psyllid-in-Dooryard-Citrus-and-Ornamentals/Tamarixia-Release-Application or call 1-800-435-7352.

So, how do I identify nests? Hornets build football-shaped or pear-like nests usually in trees, away from populated areas, mostly found in the woods. Hornets and yellow jackets seldom live near people. Yellow Jackets build above ground nests, like those of hornets, but more commonly nest in the ground. Paper wasps are frequently found around homes where they construct their honeycomb nests in shrubbery and under eaves. Mud daubers often build their mud-cell nests on the walls and under the eaves of homes. Cicada killers, which are least troublesome of all, nest in the ground. Hornets, yellow jackets, and paper wasps are social insects. They live in colonies, like bees and ants. Mud daubers and cicada killers are solitary wasps.

If wasps do become a nuisance, you can eliminate hornet and yellow jacket nests by calling a certified exterminator of if you are an experienced do-it-yourself home owner, spray the nest opening with a potent wasp and hornet pressurized spray normally found at your local garden center or hardware store.  After treating any of the aboveground nests, leave immediately and wait until the wasps are dead. Then, return, knock down the nests, and burn it. To control mud dauber, scrape down their mud cells, and spray the area with an insecticide like pyrethrum or malathion to discourage re-nesting. To treat underground nests, spray with a pyrethrum or Sevin and seal the opening with soil, to keep the insects from escaping.

The severity of reaction to a wasp sting varies drastically, depending on an individual’s sensitivity to the venom.  At best, a sting will cause painful swelling.  In extreme cases, serious illness, or even death, may result.  If a sting victim has a history of hay fever, asthma, or other allergy or if allergic symptoms develop a physician should be contacted immediately

All types of wasp nest should be approached with caution. The best times to apply insecticides are in the early morning or late evening when most of the wasps are in the nest and least active.

For more information, contact your local county extension office.

Supporting information for this article supplied by retired UF/IFAS Extension Entomologist Dr. Don Short and other information can be found in the UF/IFAS Extension EDIS publication: https://edis.ifas.ufl.edu/pdffiles/IN/IN02100.pdf

For more information on Tamarixia radiata, please visit: https://www.fdacs.gov/Divisions-Offices/Plant-Industry/Bureaus-and-Services/Methods-Development-Biological-Control/Biological-Control/Asian-Citrus-Psyllid-Biological-Control/Biological-Control-of-Asian-Citrus-Psyllid-in-Dooryard-Citrus-and-Ornamentals

UF/IFAS Extension is an Equal Opportunity Institution.

Pretty Face with a Bad Attitude:  The Invasive Chinese Tallow

Pretty Face with a Bad Attitude: The Invasive Chinese Tallow

The native Florida landscape definitely isn’t known for its fall foliage.  But as you might have noticed, there is one species that reliably turns shades of red, orange, yellow and sometimes purple, it also unfortunately happens to be one of the most significant pest plant species in North America, the highly invasive Chinese Tallow or Popcorn Tree (Triadica sebifera).

Chinese Tallow fall foliage. Photo courtesy of Daniel Leonard.

Native to temperate areas of China and introduced into the United States by Benjamin Franklin (yes, the Founding Father!) in 1776 for its seed oil potential and outstanding ornamental attributes, Chinese Tallow is indeed a pretty tree, possessing a tame smallish stature, attractive bark, excellent fall color and interesting white “popcorn” seeds.  In addition, Chinese Tallow’s climate preferences make it right at home in the Panhandle and throughout the Southeast.  It requires no fertilizer, is both drought and inundation tolerant, is both sun and shade tolerant, has no serious pests, produce seed preferred by wildlife (birds mostly) and is easy to propagate from seed (a mature

Chinese Tallow tree can produce up to 100,000 seeds annually!).  While these characteristics indeed make it an awesome landscape plant and explain it being passed around by early American colonists, they are also the very reasons that make the species is one of the most dangerous invasives – it can take over any site, anywhere.

While Chinese Tallow can become established almost anywhere, it prefers wet, swampy areas and waste sites.  In both settings, the species’ special adaptations allow it a competitive advantage over native species and enable it to eventually choke the native species out altogether.

In low-lying wetlands, Chinese Tallow’s ability to thrive in both extreme wet and droughty conditions enable it to grow more quickly than the native species that tend to flourish in either one period or the other.  In river swamps, cypress domes and other hardwood dominated areas, Chinese Tallow’s unique ability to easily grow in the densely shaded understory allows it to reach into the canopy and establish a foothold where other native hardwoods cannot.  It is not uncommon anymore to venture into mature swamps and cypress domes and see hundreds or thousands of Chinese Tallow seedlings taking over the forest understory and encroaching on larger native tree species.  Finally, in waste areas, i.e. areas that have been recently harvested of trees, where a building used to be, or even an abandoned field, Chinese Tallow, with its quick germinating, precocious nature, rapidly takes over and then spreads into adjacent woodlots and natural areas.

Chinese tallow seedlings colonizing a “waste” area. Photo courtesy of Daniel Leonard.

Hopefully, we’ve established that Chinese Tallow is a species that you don’t want on your property and has no place in either landscapes or natural areas.  The question now is, how does one control Chinese Tallow?

  • Prevention is obviously the first option. NEVER purposely plant Chinese Tallow and do not distribute the seed, even as decorations, as they are sometimes used.
  • The second method is physical removal. Many folks don’t have a Chinese Tallow in their yard, but either their neighbors do, or the natural area next door does.  In this situation, about the best one can do is continually pull up the seedlings once they sprout.  If a larger specimen in present, cut it down as close to the ground as possible.  This will make herbicide application and/or mowing easier.
  • The best option in many cases is use of chemical herbicides. Both foliar (spraying green foliage on smaller saplings) and basal bark applications (applying a herbicide/oil mixture all the way around the bottom 15” of the trunk. Useful on larger trees or saplings in areas where it isn’t feasible to spray leaves) are effective.  I’ve had good experiences with both methods.  For small trees, foliar applications are highly effective and easy.  But, if the tree is taller than an average person, use the basal bark method.  It is also very effective and much less likely to have negative consequences like off-target herbicide drift and applicator exposure.  Finally, when browsing the herbicide aisle garden centers and farm stores, look for products containing the active ingredient Triclopyr, the main chemical in brands like Garlon, Brushtox, and other “brush/tree & stump killers”.  Mix at label rates for control.

Despite its attractiveness, Chinese Tallow is an insidious invader that has no place in either landscapes or natural areas.  But with a little persistence and a quality control plan, you can rid your property of Chinese Tallow!  For more information about invasive plant management and other agricultural topics, please contact your local UF/IFAS Extension office!

References:

Langeland, K.A, and S. F. Enloe.  2018.  Natural Area Weeds: Chinese Tallow (Sapium sebiferum L.).  Publication #SS-AGR-45.  Printer friendly PDF version: https://edis.ifas.ufl.edu/pdffiles/AG/AG14800.pdf 

Storm Season and Mosquitoes, the Double Whammy

Storm Season and Mosquitoes, the Double Whammy

Attacking mosquitos are spoilers for our outdoor activity interests this time of year. Hurricanes and other storm events tend to be a catalyst that increases these populations. Not only are mosquitos a nuisance, but they are carriers of several diseases. But, there are ways to control these annoying pests and get some relief.

Mosquito populations can be divided into two categories: floodwater mosquitoes and standing water mosquitoes.

Floodwater mosquitoes need water to lay their eggs, and the eggs also need to dry out before hatching during a storm event. Moist areas like pastures, planting furrows, salt marshes and swales are prime habitat. If you look close, the eggs can be found in cracks in the soil. Again, stormy rains and surge act as a catalyst for these eggs to hatch. So, what is the approximate estimate of mosquito eggs per acre in floodwater habitat in Florida? Scientist estimate 700,000 to 1.3 million eggs per acre. And yes, that’s per acre. Unfortunately, small scale efforts to reduce standing water around properties have little effect on control.

Figure 1. Standing water mosquito and eggs (Culex quinquefasciatus).

Credit: S. McCann, UF/IFAS/FMEL.

On the other side of the coin, standing water mosquitos need,…you guessed it,  standing water to lay their eggs. These mosquito eggs cannot withstand drying out, therefore cannot hatch into larva. Females lay eggs on the surface of water with a hatching time of around 24 hours. The larva to pupae to adult stage happens quickly in mosquitoes, and the thirst for blood is not far behind. After a female finds a blood source, the cycle starts all over again. Only the females have biting mouth parts. Both male and female mosquitoes feed on the nectar of flowers. It’s the female mosquitoes that usually need a blood meal to insure mature eggs.The combination of the two groups of mosquitoes provide for a double whammy put in place by a storm. When dry areas flood, floodwater mosquito eggs hatch. When floodwater has nowhere to go, standing water mosquitoes have an abundance of places to lay eggs.

Unfortunately, some diseases can be transmitted by mosquitoes, such as west nile virus, eastern equine encephalitis and even heart worms in dogs. So, what can be done to combat these pests around your property? Reducing the amount of standing water helps dramatically, especially, dumping water holding containers. Cleaning debris from rain gutters too, can help as water can collect in blocked gutters. Mineral or cooking oil can be added to standing water and rain collection devices, as the oil forms a thin film on the surface of the water which causes larvae and pupae to drown. This is also a good control method with plant containers that collect water. Mosquito biological controls, like Bt (Bacillus thuringiensis) are helpful and will not harm pets or livestock. These products can be used in fish habitats, animal water troughs, bird baths, rain barrels, roof gutters and tree holes, just to name some. Please read precautionary statements and manufacturer application directions before use. Rain gardens are also very beneficial in suppressing standing water. If you have an area of your property that is known for water holding capacity, be sure to plant water loving plants in that area.

For more information please contact your local county extension office.

Supporting information for this article can be found in the UF/IFAS EDIS publication: “Hurricanes and Mosquitos” by C. Roxanne Connelly: https://edis.ifas.ufl.edu/pdffiles/IN/IN53500.pdf

UF/IFAS Extension is an Equal Opportunity Institution.