Diseases and Trouble Prevention for Rhinoceros Beetles and Stag Beetles | ブリちょく
Insects| ✍️ BreederDirect Editorial
Diseases and Trouble Prevention for Rhinoceros Beetles and Stag Beetles
Explains common troubles with rhinoceros beetles and stag beetles such as mite damage, fungal growth, tarsal loss, and larvae refusing food, along with countermeasures. Also introduces substrate management and methods for maintaining a hygienic breeding environment.
Key Takeaways
Explains common troubles with rhinoceros beetles and stag beetles such as mite damage, fungal growth, tarsal loss, and larvae refusing food, along with countermeasures. Also introduces substrate management and methods for maintaining a hygienic breeding environment.
Common Diseases and Troubles in Insect Breeding and How to Handle Them
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BreederDirect Editorial
The BreederDirect editorial team specializes in care information for animals, covering veterinary care and breeding to deliver beginner-friendly guides.
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Insect breeding is a deeply rewarding hobby where you can enjoy raising diverse species, from stag beetles and rhinoceros beetles to mantises, giant water bugs, and Hercules beetles. However, even with careful management, unexpected troubles are not uncommon. Larval stages are particularly sensitive to environmental changes, and even slight fluctuations in temperature and humidity can be a matter of life and death.
In this article, we explain common troubles encountered in insect breeding by case and clearly summarize the handling methods and preventive measures for each. Whether you're a beginner or experienced breeder, please refer to this guide.
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Mite and Pest Infestations
Symptoms and Causes
If you notice small white, brown, or red insects in large numbers in the breeding case or on the adult insect's body, suspect a mite infestation. Mites are difficult to completely eliminate and proliferate explosively in substrates with excessive moisture or degraded media that has been used for long periods. When they concentrate around the joints and mouth of adults, the insect becomes severely weakened and requires immediate action.
How to Handle It
Remove the adult insect from the case and gently wash its body with lukewarm water (around 30°C)
Disinfect all accessories such as the breeding case, lid, and climbing wood with boiling water, or dispose of them
Replace all the substrate and use fresh fermented substrate
Using mite-removal sheets or mite-prevention substrates is also effective
Humidity management is the fundamental preventive measure. Use the guideline of squeezing the substrate by hand until no water seeps out (moisture content 50-60%).
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Substrate Bottle Degradation and Mold Growth
Symptoms and Causes
Substrate bottles, widely used in stag beetle larval breeding, deteriorate rapidly if mismanaged. Typical signs include the bottle turning brown or developing blue or green mold over a wide area. Causes include the natural lifespan of the fungal substrate (3-4 months), temperatures exceeding 25°C, and contamination by foreign bacteria at the time of opening.
Small amounts of mold may have minimal effect on larvae, but if left unaddressed, the nutritional value of the fungal substrate drops significantly and larvae growth stalls.
How to Handle It
If you notice browning or widespread mold, promptly replace with a fresh substrate bottle
When replacing, carefully extract the larva with a spoon to avoid injury
Store and use in a cool place at 25°C or below (ideally 20-23°C)
Develop a habit of visually inspecting the substrate bottle at least once every two weeks
Note that if the white portions of the fungal substrate are decreasing and turning brown while the larva is growing significantly, this is evidence of normal consumption. Judge by the color of mold (blue, green, black) and the speed of discoloration.
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Emergence Failure
Symptoms and Causes
Emergence failure is a problem where wings or legs do not extend normally when the insect transforms from pupa to adult and become fixed in a deformed state. Wings may become crinkled, or legs may harden while remaining bent.
The main causes are as follows.
Pupation chamber damage: If the pupation chamber is damaged by digging or vibration, the body cannot be supported during emergence
Insufficient humidity: If too dry, wings harden before they can fully expand
Temperature fluctuations: Sudden temperature changes during emergence are a major cause of emergence failure
How to Handle It
If you discover a damaged pupation chamber, the best approach is to support emergence using an artificial pupation chamber. Shape a sponge or floral foam (water-absorbing material) to match the pupa's shape, creating a depression, and gently transfer the pupa. Once emergence begins, do not touch it under any circumstances and observe from a quiet environment.
Individuals with emergence failure often cannot be used for breeding, but if they survive, normal care can continue. If the insect cannot fly or has difficulty walking, provide an environment with good footing.
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Substrate Overheating and Harmful Gas Production
Symptoms and Causes
If the case is unusually warm and smells of ammonia or fermentation, the substrate may be overheating. Larvae crawling on the surface of the substrate is also a sign they are trying to escape gas and heat.
This occurs mainly when unfermented substrate (raw substrate) is used as-is. As fermentation progresses within the substrate, heat is generated, and gases such as ammonia and carbon dioxide accumulate, potentially causing larvae to suffer from oxygen deprivation and heat stroke symptoms.
How to Handle It
Always perform "degassing" on fresh substrate before use
Spread the substrate in a wide tray or storage container and leave it in a well-ventilated, shaded area for 2-5 days
Confirm that the odor has subsided and the temperature has dropped before use
Fully-composted substrate (dark and soil-like) is relatively safe, but it's still best to develop a habit of degassing immediately after opening for peace of mind.
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Preventing Troubles! Key Points for Daily Preventive Management
Most troubles in insect breeding can be prevented through proper environmental management and regular observation. Practice the following points daily.
Location selection: Place in a stable environment away from direct sunlight, air conditioner drafts, and high temperature and humidity
Temperature management: This varies by species, but aim for 20-25°C for stag beetles and 23-28°C for rhinoceros beetles
Humidity management: When the substrate surface starts to dry white, mist with water as needed
Regular observation: Check the case at least once every 1-2 weeks and confirm the larval movement and condition of the substrate bottle
Hygiene management: Promptly remove used substrate and food debris, and keep the case clean
It is also important to fully understand the characteristics of the species you are breeding. Even among stag beetles, species like the giant stag beetle and saw stag beetle have different preferred temperature ranges and substrate types. Asking the breeder directly about breeding methods at the time of purchase can significantly reduce mistakes.
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Br-choku's Safety and Assurance System
The best way to prevent troubles in insect breeding is to obtain healthy individuals from a breeder you can trust.
Br-choku is a platform where you can directly purchase living animals carefully managed by experienced domestic breeders. Even after purchase, you can message the breeder directly to ask about breeding methods, so even beginners have the peace of mind of "being able to ask if you don't understand something."
Since it is direct sales from breeders, there is less shipping stress and you receive healthy individuals
The listing page includes detailed breeding history and management methods that you can confirm before purchasing
If you have any concerns about breeding, you can consult with the breeder either before or after purchase
With correct knowledge and healthy individuals, insect breeding can be enjoyed by beginners. We encourage you to find a connection with a trusted breeder through Br-choku.
