Vegetables Gardening - Growing Organic Vegetables

I also use parasitic wasps, and pheromone- based hanging traps outside my horse barn to manage the summer fly problem. I'm now looking for an organic method to trap flies that get past these other methods and are attracted to my horses' soaking beet pulp.  In the past, I've used Tanglefoot Tangle Trap sticky coating brushed onto recycled plastic, and placed over the buckets of soaking beet pulp.  But it contains petroleum distillates, so would prefer to use something less harmful to the environment.
Anyone have any ideas?

 

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