Those Darn Ants!

Foraging Argentine ants (Photo: Alex Wild).

How many times have you been called to the teachers’ lounge, a classroom, or bathroom because someone has seen ants in and around a sink or other water source? Let's run through what might be a typical scenario:

Your look around and rule out the presence of a leak or other plumbing issue. You determine that the ants are just after whatever water is in the sink. You spend some timing looking around, but because the ants haven’t established a foraging trail, you can’t figure out how they are getting in.

So you do what you can in this situation – perhaps you make a crack-and-crevice application into any obvious cracks or gaps in an effort to keep the ants out. Maybe you even seal up a couple of gaps with some caulk or other sealant. You go through your regular spiel about making sure that food is stored properly, garbage is taken out regularly, excess water is wiped up, etc. And you’re done.

Until you get another call about ants in the same area – just a couple of days later! So, you go back, look around again – this time taking even a little more time to check for potential entry points.You know that for optimal results, you really need to find and treat the source (i.e., the nest). So you go outside and look for a nearby ant nest but find nothing. You watch the ants closely, but never see where they are coming from or going to. So you make another, more thorough crack-and-crevice application into the gaps in the area. You treat a few extra openings that you somehow missed before. And you’re done.

You wish! You get yet another call about ants in the same area. So, what can you do now? What is going on?

Well, I can tell you that I’ve had this exact same problem occur at my house – in my kitchen around the sink. And I tried everything that I wrote about above. I checked outside for a nearby nest but found nothing. Since I could find no nest, I realized that my best bet would be to attempt to keep the ants out of my house. So I treated all the obvious gaps with a crack-and-crevice insecticidal spray. I sealed up whatever openings I could see. Yet, I kept getting ants around my kitchen sink. I watched the ants carefully to try and determine exactly where they were getting in. But I could find nothing, because while there were several ants around the sink, there was never a real distinct foraging trail.

Ants recruited and feeding on jelly 
(Photo: Patty Alder).

Then it hit me: I realized that in order to find the entry point(s), I needed a distinct foraging trail. So I placed a very small dab of apple jelly on a piece of cardboard, placed it on the counter near the ants…. and waited. It didn’t take long – maybe 20 minutes or so – for more ants to show up (see photo at right).

Pretty soon, I had myself a pretty distinct trail of ants going from my kitchen sink to…. a small opening where the caulk had come out in an area on the counter right behind my sink. (see photos below). A small opening that I had overlooked! So I treated that opening with a crack-and-crevice spray and guess what? No more ants!

Foraging trail can be followed from the jelly down 
the window frame (Photo: Patty Alder).

Ants were coming in through a gap in the counter 
behind the sink (Photo: Patty Alder).

If you have this issue with ants, set out a bit of jelly on an index card in a couple of areas where you are seeing the ant activity. If the ants are in a classroom, make sure you explain to the teacher that he/she needs to keep the children away from the area so as not to interfere with the ants’ activity. Check back in about 30 minutes for a trail of foraging ants and carefully follow the ants to see if you can determine how they are gaining entry into the area. If jelly does not seem to attract the ants, you could try a small piece of cheese or a potato chip (I wouldn’t use peanut butter in schools because of all the issues with allergies). Once you figure out where the ants are coming in, you can treat that opening with a crack-and-crevice application. You may even want to seal up the opening after it has been treated.

Good luck and happy ant hunting!

Bed Bugs and Book Bags

The University of Florida teamed up with the Jacksonville Bed Bug Task Force to create the “Bed Bugs and Book Bags” curriculum for grades 3-5 (the kids that seem to bring the most bed bugs to school).

The "Bed Bugs and Book Bags" curriculum follows learning standards for science and health educators, but many housing authorities have on-site after school programs that could use the activities. Any organization that works with kids should know about these lessons.

Check out the curriculum at http://entnemdept.ufl.edu/bug_club/Bed_bugs.html.

After watching a presentation (meant to give teachers the facts they need to teach their students) and passing a quick quiz, the lessons can be downloaded. If you’re already a bed bug pro, you can fast forward through the presentation and should still pass the test with flying colors.

Warmer Weather Bringing Out Some Pests, by Mike Waldvogel

Ground-nesting bees. Warm temperatures and the recent rains are promoting a burst of insect activity. We received a call a couple of weeks ago from a school system about "swarms" of bees showing up on the school grounds. These are most likely the solitary “digger” bees, particularly andrenid bees. Colletid bees will follow suit within a few weeks. People often mistake andrenid bees for honey bees because they are similar in appearance, although typically have blackish abdomens and light-yellow hairs.

Andrenid bee (Photo by Tony DiTerlizzi)

The bees begin foraging for food and seeking out new nesting sites. This activity will continue for the next 2 months or so depending on the area of the state and the species of bee. The bees dig a vertical tunnel in the soil, particularly in areas where the soil drains well and vegetation may be sparse. They make small side chambers off the main tunnel and provision them with pollen for their offspring. These bees are "solitary" which means there is no true colony which is supported by worker bees. Mating takes place at this time, so a lot of the "swarming" is just males and females trying to pair up. The bees frequently make small mounds in the soil, and small clusters of these nests may be seen together, but each mound is all made by an individual female bee. At one school in Raleigh, we’ve had reports of 5 or more nests in just 1 square foot of lawn. The damage can be unsightly with large numbers of mounds in the turf, but it is mostly a cosmetic issue. The bigger problem is usually that people walking by panic because they assume that these are swarms of honey bees (or a similar bee) that will likely attack them if they venture too close to "the nest." Turf-nesting bees can sting but rarely do, so unless you accidentally step or sit on one (which kids might do while playing), they are not likely to sting. Since they are not "social," there is not a large number of worker bees trying to protect a nest. So, there is no "mass attack" as might occasionally occur during a close encounter of the yellowjacket kind (and it's still early in the year for us to see any yellowjacket colonies out there).

These ground-nesting bees are beneficial and should be left alone if possible. Any pesticide that you typically use outdoors for such sites could be applied, but success is likely to be marginal because of the duration of activity. The bees often try to dig into the sand in play areas at schools and childcare facilities, which is a concern particularly for parents and teachers with children that are severely allergic to bee stings. Any chemical treatment in sandy play areas is strongly discouraged because of the contact kids have with the soil (and which they might get in their mouths as well). If the bees try to nest in a sandbox, a simple solution is to cover it during the day but it will take a few weeks for you to deter most of the bees that show up over time. While this isn't always successful, you could saturate the area with soapy water which will bring the bees out and probably kill some in the process since soap does work as an insecticide. Since the bees prefer well-drained areas, water-staturated soils will deter the bees but again we're looking at activity that can take place over a few weeks.

Information, including pictures, of these bees and the "damage" that they cause can be found at:

http://www.ces.ncsu.edu/Insects/O&T/lawn/note100/note100.html

Termite Swarms in School Buildings

It’s that time of year again – time for termite swarmers to start showing up. You may have already experienced some swarms in some of your buildings. Eastern subterranean termites generally swarm from late-February to May. Swarming usually occurs during the day, particularly on warm days following rain. Swarmers found outdoors near tree stumps, landscape timbers, etc., are not an indication that a structure is infested, but they serve as a reminder that termites live around us. When swarming occurs indoors, it usually means that there is an infestation somewhere in the building.

If you have indoor swarmers, just suck them up in a vacuum cleaner. Place the vacuum bag inside a plastic bag and seal it before disposing of it. There is no real need to spray them, and spraying would require notification. There is also no need to rush treating the building. This situation would not be considered an emergency. Plan the treatment for a teacher workday where that part of the building is or can be vacated. The treatment will vary depending on where the termites were found swarming. A spot treatment may be all that is needed and will not be as expensive as a full treatment of the structure.

EPA Centralizes Healthy Child Care Training and Curriculum Resources

Child care providers have a lot to do; pest management can be just another thing on an already full plate. To help ease the burden, US EPA launched a resource directory for child care providers. It includes fact sheets, trainings, and assessment tools on asthma, chemical hazards, green cleaning and IPM. Resource directory materials can be used as handouts at meetings, placed in staff lounges, transmitted electronically in newsletters or sent home with students for parents to use.

The directory links to numerous sources including Guidelines for IPM for Pest Management Contracts in Childcare Centers from Penn State University which includes Set Up Your IPM Program in Eight Steps and How Do I Know I'm Receiving IPM Services? Another fact sheet, Pesticides and Their Impact on Children: Key Facts and Talking Points, explains the dangers of pesticide poisoning in young children and gives a brief step-by-step IPM tutorial.

Insect of the Week - Mystery Insect Revealed!

Remember this mystery insect from last week:

Photo by Alex Wild (www. alexanderwild.com)

The only hint given last week was that this little critter was, in fact, an insect (because it has three pairs of legs). No one had any good guesses - and I have to admit - this was a tough one!

So, now to reveal the mystery - drum roll please..... this little critter is a firefly (or lightning bug) larva! Who knew a firefly larva was so strange looking!

We all know that adult fireflies "light up" - they emit light that we enjoy watching on hot summer nights. For many of us, spotting and catching fireflies is one of our favorite summertime memories.

Fireflies use their lights to talk to each other. Adults emit light mostly to attract mates, but they may also use their light to defend their territory and keep predators away. In some firefly species, only one sex lights up. In most, however, both sexes emit light. Male fireflies flash their abdomens in species-specific patterns, hoping to attract the attention of a female hiding in the grass. An interested female will return the pattern, helping guide the male to her in the darkness. Firefly light patterns will vary in frequency and length, and are species-specific. In addition, the height at which they emit their light while in flight will vary depending on the species. Pretty cool, huh? One other interesting fact about fireflies - they are actually beetles!

Firefly larva (Photo by Jasja Dekker)

So, we all know adult fireflies emit lights, but did you know that firefly larvae also light up? But why do the larvae glow? What purpose does it serve? Light emitting serves a different function in larvae than it does in adults. It appears to be a warning signal to predators since many firefly larvae contain chemicals that are distasteful or toxic. 

Firefly larvae live on the ground, under bark, and in other moist places. They eat earthworms, snails and slugs. Larvae may also scavenge on certain small dead animals and other organic material. They have sickle-shaped mandibles with which they can inject a kind of chemical that paralyzes their prey and helps digest it.

Check out this amazing video below to see a firefly larva glowing:

http://www.myspace.com/video/quaoarlo/firefly-larva-of-thailand/24023925

Insect of the Week - What Am I?

Another mystery creature this week! Take a look at the photo below and take a guess at what type of critter this is. Here's a tidbit that might help narrow things down:  insects have just three pair of legs. So, this mystery insect is, in fact, an insect and not a creature closely related to an insect. The answer will be revealed next week!

Photo by Alex Wild, www.alexanderwild.com