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Sticky yellow bee droppings are a good thing

If you are keeping bees for the first time you may have 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 keep their home clean

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. You may see fecal trails 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.

Beware of droppings inside the hive

Fecal accumulation inside the hive occurs when the bees can no longer hold their feces. This may be caused by a poor-quality diet or by a disease organism. For example, honey bee dysentery is a result of a food source with too much indigestible material in it. Dysentery can be confused with Nosema apis, 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, which is 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, another closely related disease, Nosema ceranae, can kill whole colonies of bees by causing damage to the honey bee gut. But Nosema ceranae does not cause dysentery-like symptoms. Many researchers believe that these disease organisms are everywhere, but they 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.

Honey Bee Suite



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



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


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




Is the massive amount of droppings on windows seasonal?



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.


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.



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.


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:>)



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!


It is spring and my bees are just emerging. They have left a lot of fecal material out the back entrance from the inner cover. How do I know if this is normal cleansing or something to worry about?



If all the fecal material is outside, I don’t worry about it. The bees were able to wait until they got outside, even if they didn’t drop it very far away. However, if you see feces on the top bars or dripping down between the frames, then there is something to worry about.

I used to worry about the color, but I notice that the yellow droppings oxidize and eventually turn brown, so I don’t use that as a standard anymore.


Is honey bee fecal mater edible and if so, how does it taste?



I’ve got a plan for you. Why don’t you test it and report back?