Flies are not directly attracted to wood as a primary food source or nesting site. Their presence in wooden areas is typically indirect, stemming from other associated elements. Understanding these underlying attractants clarifies why flies might appear in such environments.
Do Flies Attract to Wood Itself?
Wood, primarily composed of cellulose, does not provide the nutritional content most common fly species require for sustenance or reproduction. Flies are opportunistic feeders, but wood does not serve this purpose. They do not consume cellulose, nor does it offer the sugars, proteins, or decaying organic matter that typically draw flies.
While insects like termites consume wood, flies do not. Flies, such as houseflies and blowflies, primarily seek decaying organic material for feeding and egg-laying.
What Really Attracts Flies to Wood?
Flies are drawn to wood indirectly by various environmental factors and substances found on or near wooden structures. Decaying organic matter is a significant attractant, including food spills, fruit scraps, pet waste, or other decomposing biological material left on wooden surfaces like decks or picnic tables. As organic matter decomposes, it releases gases and generates heat, signaling a suitable food and breeding ground for flies.
Moisture and the growth of mold or fungi also attract specific fly species. Damp wood encourages the proliferation of mold or fungi, which can serve as a food source for certain flies, including fungus gnats and drain flies. These flies are drawn to microbial volatile organic compounds released by mold and the moist conditions where mold thrives.
Wood infested with other insects can indirectly attract flies that prey on these insects or their byproducts. For example, flies might be drawn to the presence of aphids on plants near wood or the debris left by carpenter ants.
Flies may also seek shelter or warmth in wooden structures. Cluster flies, for instance, invade attics and crevices in buildings, including wooden ones, during the fall as they search for protected overwintering sites. They are attracted to the warmth and shelter provided by these structures, not the wood as a resource.
Keeping Flies Away from Wooded Areas
To effectively deter flies from wooden areas, focus on eliminating the indirect attractants that draw them there. Regularly clean wooden surfaces such as decks, patios, and outdoor furniture to remove any food debris, sticky substances, or organic spills. Promptly disposing of garbage and ensuring trash cans are tightly sealed will also remove significant attractants.
Addressing moisture issues is also important, as damp conditions promote mold and fungal growth. Fix any leaks, improve drainage around wooden structures, and ensure proper ventilation to prevent wood from remaining wet. This helps to eliminate breeding grounds for flies attracted to mold or moisture. Promptly remove decaying plant matter, fallen leaves, or other organic waste from around wooden structures to reduce potential food sources and breeding sites.
Sealing cracks and crevices in wooden structures, like siding and window frames, can prevent flies like cluster flies from seeking shelter indoors during cooler months. Managing other pest infestations, such as aphids or ants, will also reduce indirect fly attractants. Using natural repellents like citronella candles, essential oils (lavender, peppermint, eucalyptus, pine oil), or planting herbs like basil and rosemary around wooden areas can further deter flies.