However, if you are using this method don't forget to treat the strips with an approved fly repellent. This is one area that producers often fail to follow up on as the planting and harvesting season for crops and hay progresses. If you plan to use fly tags it is best to place these in the herd just prior to the onset of the heavy infestation of flies. Placing them in the ears before the cattle go to grass tends to reduce the effectiveness of this material as the summer grazing season progresses. Another important point to consider is to rotate the product you are using.
Flies tend to build up immunity to a single product, which reduces the effectiveness of the control.
Feeding some form of larvacide in the mineral will break the life cycle within the herd. However, if your neighbor isn't feeding a similar material then the flies seem to cross the fence and create a problem in your herd. The best method I know of is to be consistent with product application and treat according to directions. Continuous treatment throughout the grazing season does more than just control flies. Frequent observation of the herd is a positive management tool under any circumstance.