Per BioAdvance Season - Long Grub Control Plus Turf Revitalizer’s label: Avoid applying this product to waterlogged areas, as this may decrease the product’s effectiveness. We recommend applying the product at least 24 hours after rain and to water the treated area thoroughly within 24 hours after the application.
BioAdvanced Season Long Grub Control Plus Turf Revitalizer is not labeled to target armyworms. However, you could consider using Talstar XTRA Granular Insecticide as an alternative, which is labeled for armyworm control at a rate of 1.15 to 2.3 lbs. per 1,000 sq. ft.