Category Archives: Nature

June trip to Lake Mohonk

Here are some of my favorite photographs from a recent stay at Mohonk Mountain House in New Paltz, New York. I also have a few non-macro pics at the end in case you’re curious what the place looks like.

This is Loxocera cylindrica (Psilidae). They puncture and hoover up fluids from leaves, resulting in patches of brown discoloration that give the family its common name (rust flies). Larvae mature inside stems of inland sedge (Carex interior), which tend to grow around calcareous swamps and marshes.

This was so small I assumed it was a spider with just six legs. Eventually figured out it was a gall fly (Cecidomyiidae) when I loaded the photographs onto my computer. It was hanging on spider silk, a behavior that is apparently quite common in the family.

And one more fly: Limonia indigena. BugGuide, my go-to source for obscure facts, says that members of the genus spend their youth in gelatinous tubes on moist surfaces that harbor algae.

This is a Hart’s jumping spider (Tutelina harti) that was thinking about leaping onto my camera. I’ve always wondered whether spiders see the lens and assume it’s an eye. I love the white stripe below the eyes.

Caddo agilis, a diminutive, predaceous harvestman. I first encountered this several years on the exact same patch of moss. The reason why they are assumed to be hunters is partly because they have such big eyes. They are also are incredibly fast runners. The stuff of nightmares, to be honest.

Shaler’s Fabiola moth (Fabiola shaleriella). This is another repeat species for the location, and I always seem to find them on the same stretch of rock. Like most small moths people have no idea what the larvae eat. I’m wondering whether it might use lichen.

This is some sort of bristletail, wingless insects that move like predators but apparently eat lichen. The small photograph doesn’t do justice to the scales and eyes so below is a close-up.

I’m hoping that the eyes can help with identification but so far nobody has weighed in on iNaturalist. They are apparently very hard to narrow down.

This is a larva of Feralia jocosa (Noctuidae), which apparently goes by the common names “the joker” and “jocose sallow.” It’s munching on eastern hemlock (Tsuga canadensis). Adults are gorgeous but I’m not sure what is so funny about them. Probably an inside joke.

As in many parts of North America the eastern hemlocks at Lake Mohonk are getting hammered by the invasive hemlock wooly adelgid (Adelges tsugae). There were no signs of the beetles (three different species) and silver flies (two Leucotaraxis spp.) that are known to attack them.

The spongy moths (Lymantria dispar) were everywhere this year and seem happy eating everything, even toxic mountain laurel (Kalmia latifolia) that deer won’t touch.

I’m not exactly sure what this tiny mushroom is, but possibly a moss bell (Galerina hypnorum). If genus is correct then very likely highly poisonous, thanks to amatoxins, the same compounds that are in death caps (Amanita phalloides).

Finally, below are some scenes from around the hotel. It’s such a beautiful place. Do not go if you’re trying to lose weight.

If you want to see more photographs of Mohonk Mountain House please check out my gallery on Smugmug.

Happy holidays

In case anyone stumbles onto this page today, here’s a festive Christmas lichen (Cryptothecia rubrocincta) that I photographed several years ago in Myakka River State Park, Florida.

The red projections in the middle are isidia, vegetative outgrowths that can break off and form new lichens. Each little piece will have bits of the requisite fungal (Cryptothecia rubrocincta) and algal species (Trentepohlia sp.) that team up to bring us this lichen.

Bti honeypot traps for killing mosquito larvae

An easy way to kill thousands of mosquitoes each summer is to set out a container of water, add a handful of leaves or hay, then drop in 1/4 of a Mosquito Dunk, a compressed, shelf-stable form of Bacillus thuringiensis israelensis (“Bti”) that kills larvae. Pregnant females will oviposit onto the water surface as well as onto the sides of the container and when the larvae begin to feed they’ll be killed by the toxins produced by the bacteria. Just add a fresh crumble of Mosquito Dunks every three weeks to ensure the system is operating as needed.

Photograph of a green bucket covered with black mesh, resting on a snow-covered step. Next to it is a milk jug filled with water, a container of dried leaves, and a package of Mosquito Dunks.

Tips

  1. Cover the container with chicken wire or netting to prevent birds and chipmunks from drowning.
  2. Add a long stick that can fit through the mesh so that innocent insects that fall into the water have a way to crawl back out. Bonus: some mosquito species increase oviposition rate when wet wood is present.
  3. Add a white object that allows you to see whether there are larvae wriggling around.
  4. Make more than one to maximize the effect.
  5. Set traps out in early spring so that the leaves have time to decompose and become attractive to female mosquitoes.
  6. Site near vegetation or at the bases of larger trees. Avoid areas that get a lot of direct sunlight.
  7. Set up a reminder on your phone to add more Mosquito Dunks. NB: if you forget, the buckets will be generating mosquitoes.
  8. If you’re traveling for more than three weeks during the summer, dump out all your buckets and start over when you return.
  9. Purge your yard of all other objects that might retain stagnant water so that mosquitoes are forced to leave their eggs in the trap.
  10. Make some for your neighbors, especially those who are spraying pyrethroids.
  11. Get local folks on board by writing a letter to your local paper (e.g., here’s my March 2026 blurb in The Swarthmorean). The more people who use these traps the better.

Are they working?

To determine whether mosquitoes are ovipositing, just look for egg rafts on the surface of the water (photo below, left). You can also check for eggs of Asian tiger mosquitoes (Aedes albopictus) which are oviposited singly or in small groupings on the edges of the container, above the waterline, or on pieces of wood that are floating on the surface (photo below, right). If there are eggs and no larvae, the Bti is doing its thing. If you see larvae in the water, they are not working — if that’s the case, dump everything and start over or add some fast-acting Mosquito Bits (kills in minutes, just as safe) along with a fresh chunk of Mosquito Dunk. Here‘s a great photo on Reddit with several thousand first-instar larvae swimming happily with a non-functioning Mosquito Dunk. If you don’t trust yourself to ID larvae, send me a pic or tag me on social media.

Safety

Bti toxins are completely nontoxic to mammals, birds, and all insects except mosquitoes, black flies, and fungus gnats. For an excellent overview of the mode of action and safety, please see this report (PDF).

Sources of Bti

The instructions above mention Mosquito Dunks but there are other products that contain live Bti. Just search for any of the following: Biosolutions Bactive, Bonide Mosquito Beater Water Soluble Pouches, Bactimos mosquito dunks, Terro Mosquito Larvacide Pouches, VectoBac Water Dispersible Granules.

Other sites with similar information