Hi Doc,
Ano po bang magandang spray na water base o pamatay langaw sa chicken poultry sa ngayon po ang daming langaw ngayon sa poultry namin sana matulungan nyo ako dito. salamat

Some brand that you could use is agita, neporex, quick bsyt, and rsigen EC. I cannot attest for the effectivity of the said product for i haven't used it.

This is just possible product you could try.