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Late Summer and Fall Insect Pest Control in Livestock As we transition into the latter part of the growing season, it's crucial to be proactive in considering late summer and fall pests. Both stable and horn fly populations tend to decline over the dry, hot part of summer but can resurge in late summer into fall if sufficient rainfall occurs. Horn flies are found on the back and belly of the animals and stay constantly associated with the cattle host, making early intervention with topical insecticides (pour-ons, sprays, and ear tags) an effective control method with appropriate rotation. Stable flies, in contrast, feed preferentially on the legs of the animal for a short period of time (2-4 minutes), 1-2 times a day. This low contact time with the host makes chemical control difficult to achieve. Decaying hay and plant material is a primary breeding site for stable flies, so early attention to hay bale and feed wastage and surrounding crop fields is key.