Wood bees, often referred to as carpenter bees, are a common sight during the warmer months, diligently flying from flower to flower. While their daily activities might seem focused on nectar, their dietary needs are more complex than a simple sweet treat. Understanding what these essential pollinators eat is crucial for appreciating their role in the ecosystem and for managing their presence around wooden structures.
The Primary Diet of Adult Wood Bees
Adult wood bees survive almost exclusively on the nectar and pollen collected from blooming plants. You will find them visiting a wide variety of flowers, showing a particular preference for open-face blossoms like lilacs, honeysuckle, and cherry blossoms. The nectar provides them with the quick energy required for flight and daily activities, while the pollen serves as their main source of protein and fats, essential for bodily functions and reproduction.
Why Nectar and Pollen?
The nutritional composition of nectar and pollen is perfectly suited to the wood bee's biology. Nectar is essentially sugar water, delivering the high-energy carbohydrates these insects need to power their active lifestyle. Pollen, on the other hand, is a complete protein source, supplying amino acids that the bee cannot synthesize on its own. This combination ensures the adults remain strong and healthy throughout the flowering season.
Feeding the Next Generation: Larval Diet
The dietary habits of wood bees shift dramatically when it comes to raising their young. Unlike the adults, the larvae are unable to forage for themselves and require a completely different menu. A female bee will collect pollen and nectar, mix it with her saliva to create a semi-liquid substance known as "bee bread," and place it inside a chamber within the nest tunnel.
The Role of Bee Bread
This carefully prepared bee bread serves as the sole food source for the developing larvae. The mixture ferments slightly, breaking down the pollen and making the nutrients more bioavailable for the growing offspring. The larvae consume this nutrient-dense paste until they are ready to pupate and eventually emerge as adult bees, ready to continue the cycle.
Wood as a Nesting Material, Not Food
A common misconception is that wood bees consume the wood they drill into. This is entirely false. While their name suggests otherwise, wood bees are strictly nectar and pollen feeders; they do not eat the wood itself. Instead, they use their powerful mandibles to excavate perfectly round tunnels in untreated or weathered wood to create nests for their eggs.
Excavation vs. Consumption
The purpose of this tunneling is purely structural. The female bee creates a main tunnel and then constructs individual brood cells off the main shaft. She lines these cells with the bee bread mixture before laying an egg on top. The wood is simply displaced and removed from the nest, often resulting in a pile of sawdust-like frass beneath the entrance hole, but it is never ingested. Differences Between Wood Bees and Honey Bees It is helpful to distinguish wood bees from honey bees when discussing their diet. While both are pollinators that feed on nectar and pollen, their nesting strategies differ significantly. Honey bees are social insects that live in large colonies within hives, storing honey and pollen for the winter months.
