Sticky yellow bee droppings are a good thing

If you are keeping bees for the first time you have probably noticed all the fecal droppings—sometimes called frass—that appear out of nowhere on your cars, porch rails, or lawn furniture. These droppings are incredibly sticky and difficult to remove—even modern car washes leave them perfectly intact. They are often round and yellow or, if on a vertical surface, long and yellow.

Since I like to write outside, I’ve had them drop on my keyboard and decorate my screen. The “use and care” instructions that come with laptops warn us to use nothing but a damp cloth on these surfaces, so I know the manufacturers never contemplated living beneath thousands of foraging bees. Water is no match for bee poop. The good news is this: these droppings are perfectly normal and a sign that all is well.

Honey bees work hard to keep their living quarters clean. An individual worker bee will hold her feces until she is well away from the hive. The queen, larvae, and drones have their feces cleaned up by the workers and the result is an amazingly clean area, considering how many individuals live in such a small and confined space.

Winter workers will hold their feces many weeks until the air is warm enough for a brief cleansing flight. Fecal trails can often be seen on the snow not far from the hive, or sometimes even on the roof of the hive. This is also normal and nothing to worry about. But lots of feces at the entrance or on the frames is a sign of something gone awry.

Fecal masses inside the hive occur when the bee can no longer hold the feces because of poor food or a disease organism. Honey bee dysentery is a result of a food source with too much indigestible material in it. Nosema apis is a fungal disease of the honey bee which causes dysentery-like symptoms.

Many sources equate Nosema with dysentery, but they are not the same thing. Bees can have dysentery without having Nosema. For example, sometimes bees will consume the sweet juice of overripe fruit. This substance—high in fiber—can give bees dysentery. But only the pathogen Nosema apis can give them the Nosema disease with dysentery-like symptoms. The only way to tell them apart may be a laboratory analysis.

To complicate matters, there is another closely related disease, Nosema cerane, that can kill whole colonies of bees by causing damage to the honey bee gut without causing the dysentery-like symptoms. Many researchers believe that these diseases are everywhere, but take advantage of bees that are stressed or undernourished, whether from other parasites, monocultures, or pesticides. The best way to keep your bees from contracting diseases like Nosema is to provide good nutrition, adequate ventilation, and a healthful, low-stress environment.

Rusty

Comments

walter
Reply

Does the fecal matter contain any bacteria that is harmful to humans?

Rusty
Reply

Walter,

I’ve never heard of any problem with bee fecal material being harmful to humans.

Rajesh
Reply

Can the fecal matter of honeybee act as bio-fertlilizer?

Rusty
Reply

Yes.

anne
Reply

Is the massive amount of droppings on windows seasonal?

Rusty
Reply

Anne,

Yes. The droppings occur when the bees are actively foraging, especially in the spring and early summer when the populations are the highest and the most brood rearing is happening. I suspect that in New Zealand they are at or near their peak right now.

Annemarie
Reply

In my area, Coromandel Peninsula New Zealand, they seem to prefer my freshly washed white bed linen to leave their poo on. How do I remove it? Washing doesn’t help much and spot cleaning with soft soap and a brush doesn’t work either. I hope you have a solution to the problem.

Rusty
Reply

Annemarie,

That’s a tough one. I find soaking is the best treatment, but I don’t know how well it will work with white fabric. But it’s worth a try. Soak them in plain cool water for a couple of hours before you wash.

Annemarie
Reply

Thanks for that Rusty but just soaking didn’t help. Found that soaking overnight in a bucket with a de-greaser like Nappysan or Sard did get rid of most of the yellow. Washed the linen again which is now drying in the workshop where the bees can’t find it. All the Manuka trees are in flower at the moment: almost a white Christmas here! Never seen so many flowers on them! The bees are having a ball:>)

Rusty
Reply

Annemarie,

Glad to hear you got it worked out. I will make a mental note of that method for future reference.

BTW, the Manuka flowers sound beautiful!

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