Complete Guide to Choosing Stag Beetle Breeding Wood | Wood Types, Hardness, Watering Methods & Tips for Success
Explanation of how to choose breeding wood (logs) for stag beetle reproduction. Introduction to wood types, hardness selection methods, watering techniques, setup procedures, and recommended materials by species.
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Explanation of how to choose breeding wood (logs) for stag beetle reproduction. Introduction to wood types, hardness selection methods, watering techniques, setup procedures, and recommended materials by species.
In the breeding of stag beetles, the selection of breeding wood (breeding logs) is one of the most critical factors that greatly influences the number of eggs laid. Since different species of stag beetles prefer different hardness levels and types of wood, choosing breeding wood suited to the species you are raising is a shortcut to breeding success. This article provides a detailed explanation of how to choose breeding wood for stag beetles.
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Types and Characteristics of Breeding Wood
The wood used for stag beetle reproduction primarily consists of broadleaf trees such as Japanese oak (Kunugi), red oak (Konara), Japanese beech (Buna), and nettle tree (Enoki). These woods match the species of decaying wood where stag beetles naturally lay eggs, allowing us to recreate the environment preferred by females.
Quick Reference Table of Breeding Wood Types
Wood Type
Characteristics
Suitable Species
Kunugi Wood
High versatility with diverse hardness options
Giant stag beetles, flat-horned stag beetles, saw stag beetles, and many others
Konara Wood
Lower density and softer than Kunugi
Small species, species with fine mandibles
Beech (Kawara) Wood
White color, treated with shelf fungi
Tarandus stag beetles, golden onyx stag beetles (essential)
Artificial Kawara Wood
Uniform quality, high success rate
All wood-spawning species using Kawara material
Kunugi wood is the most versatile breeding wood, suitable for many species including giant stag beetles, flat-horned stag beetles, and saw stag beetles. Kunugi is widely distributed throughout Japan, making the wood easy to obtain. The wood comes in a wide variety of hardness levels, with options ranging from soft to harder varieties.
Konara wood is a tree of the same beech family as Kunugi, with a tendency toward slightly lower density. It tends to be softer than Kunugi and is suitable for small species of stag beetles with weaker wood-boring power.
Beech wood is characterized by its white appearance and is distributed in shelf fungus-treated form. It is essential for species such as Tarandus glossy stag beetles and golden onyx stag beetles that will not lay eggs unless Kawara wood is used. Beech Kawara wood serves as a trump card for species that will not lay eggs in normal Kunugi or Konara wood.
Artificial Kawara wood is produced by artificially cultivating shelf fungal mycelium on beech or Kunugi wood, achieving more uniform quality than natural decaying wood. While the price is somewhat higher, it is supported by many breeders due to its high egg-laying success rate.
How to Choose Wood Hardness
The hardness of breeding wood must be chosen to match the egg-laying behavior of the species you are raising. Generally, species with large mandibles or powerful species prefer harder wood, while small species and those with delicate mandibles tend to prefer softer wood.
Quick Reference Table of Preferred Wood/Setup by Species
Stag Beetle Species
Preferred Wood/Hardness
Spawning Setup
Giant Stag Beetle
Slightly soft to medium hard (Kunugi)
Wood placed horizontally, half exposed
Flat-horned Stag Beetle
Medium hard to slightly soft
Wood + substrate combination
Saw Stag Beetle
Soft
Wood half-buried + substrate
Miyama Stag Beetle
Primarily substrate spawning
Substrate only is also acceptable
Tarandus/Golden Onyx
Kawara wood essential
Kawara wood
Hardness is determined by the feel when pressing with your fingers. Wood that is easily penetrated by fingernails is classified as "slightly soft," wood that dents slightly when pressed firmly with a finger is "medium hard," and wood that does not dent at all when pressed with a finger is classified as "hard." A practical method is to lightly press a screwdriver against the wood and observe how easily it penetrates.
Giant stag beetles are the representative preference for harder wood. In nature, they lay eggs in harder decaying wood eroded by shelf fungi or shiitake fungi. Choose slightly soft to medium hard wood. They often do not lay eggs in completely crumbly, soft wood.
Flat-horned stag beetles lay eggs in medium hard to slightly soft wood. Additionally, since many flat-horned stag beetles lay eggs in substrate, a spawning setup using both wood and substrate is effective. Saw stag beetles also tend to lay eggs in soft wood or within substrate, making a setup with softer wood half-embedded in substrate appropriate.
Miyama stag beetles have a strong tendency to spawn in substrate, and a spawning setup using only substrate without breeding wood also has a high success rate. However, if wood is provided, females may chew on it for supplemental nutrition, so it is fine to include one piece of soft wood.
Hydration and Preparation of Breeding Wood
Breeding wood is dry when purchased, requiring proper hydration before use. The hydration method involves filling a bucket or storage container with water and submerging the breeding wood for several hours to half a day. It is efficient to place a weight such as a brick on top to ensure the wood is completely submerged.
The duration for hydration varies depending on the hardness and thickness of the wood. Soft wood absorbs water quickly and 2-4 hours is sufficient. Hard wood requires longer for water penetration, necessitating 8-12 hours (overnight) of hydration. Thicker wood similarly requires longer hydration, and wood with a diameter of 10 cm or more should be soaked for at least half a day.
After hydration, shade-drying for half a day to one day is important. By evaporating excess surface moisture, the moisture content near the bark becomes appropriate. Excessive shade-drying can cause desiccation, so aim for a state where the surface feels "moist but does not ooze water" when touched.
Opinions differ on whether to remove the bark or leave it. Since giant stag beetles naturally lay eggs on hard parts of bark, some keepers use wood with the bark left intact. On the other hand, for flat-horned stag beetles and saw stag beetles, removing bark tends to increase the number of eggs laid. If uncertain, a compromise is to remove only half the bark.
How to Set Up a Spawning Setup
The approach to setting up a spawning setup differs between wood-based spawning and substrate combination spawning. Here we introduce representative setups.
For giant stag beetle spawning setup, firmly pack fermented substrate about 3 cm deep on the bottom of a medium to large container, then place the hydrated and shade-dried breeding wood horizontally on top. Bury the wood with substrate around it, leaving about half the top surface visible. Place 2-3 jelly cubes and introduce the female. Breeding wood with a diameter of 8-12 cm and length of about 15 cm is most practical.
The key to a flat-horned stag beetle spawning setup is using substrate in combination. Firmly pack substrate about 5 cm deep at the bottom, place the wood on top, and add substrate until the wood is completely buried. Slightly higher moisture content in the substrate is appropriate. Since female flat-horned stag beetles lay eggs in both wood and substrate, both environments are provided.
When using two pieces of breeding wood, inserting one piece each of different hardness increases the probability that the female will lay eggs in the one matching her preference. Increasing options by using different hardness levels rather than two pieces of the same hardness is expected to improve egg production.
Troubleshooting Breeding Wood Problems
If the female does not lay eggs even after setting up the spawning setup, several causes are possible. If the wood hardness is not suitable, try replacing it with wood of different hardness. If the wood is insufficiently hydrated, additional hydration is necessary. If the setup has too much moisture, replace part of the substrate to adjust moisture levels.
If the female does not chew on the wood at all, it indicates she has no interest in the wood. In this case, try measures such as changing the wood type (from Kunugi to Konara, or to Kawara wood), changing the wood hardness, or adjusting the setup temperature. Also check whether sufficient time (2-3 months) has passed since the female began feeding.
If mold grows on the breeding wood, it is likely due to insufficient shade-drying after hydration or excessive humidity in the setup. White mold is relatively harmless, but if blue mold or black mold develops extensively, it is better to replace the wood. To prevent mold, it is important to ensure ventilation and maintain appropriate moisture levels.
The egg extraction process (breaking open the breeding wood to retrieve eggs and larvae) should be done 1-2 months after introducing the female. Carefully break open the wood and gradually dismantle it with a flathead screwdriver to avoid damaging eggs or first-instar larvae. Manage extracted larvae individually in small cups and move them to fungal medium bottles or substrate containers after they reach the second instar.
On BreederDirect, you can purchase specimens directly from breeders with extensive stag beetle breeding experience, and you can learn from them about the types of breeding wood they use and how they set up their spawning configurations. Since each species has unique breeding tips that vary by breeder, practical advice from experienced breeders is extremely valuable. If you are considering breeding, be sure to consult with a breeder.
