Emmaron is a product that has two active ingredients lufenuron and emmamectin benzoate and this gives it extra strength to act on the army worm.
It is a broad product for caterpillars, works well on DBm in cabbages, fruitflies in watermelon and butternuts.
Rate of use is 10ml in 20ltrs of water.
Ensure when spraying fall army worm you target morning or evening hours.