Where they appear: Fly activity is often concentrated around kitchens, bins, outdoor entertaining spaces, pet areas and other locations containing food or organic waste. Why activity increases: Warm conditions, accessible food and suitable breeding areas can cause fly numbers to increase rapidly. Understanding the source is often more useful than dealing with individual flies. Reducing fly activity: Keep bins sealed, remove food waste regularly, clean outdoor food areas and address standing moisture where practical. Persistent fly problem?: Best Pest & Weed Solutions can assess the activity and recommend a targeted fly control treatment. View Fly Control.