Ya know, could you look again? The 'Japanese beetles" I've known all my life have a green thorax and shiny brown wings.
They cause me minod damage but I have big problems with leaf feeding by another asiatic beetle- smaller and solid brown.
Let's make sure the milky spore is even going to touch the target insect.
Link for picture only
https://www.gardentech.com/ins...
Then I think I've read, pay attention to timing of application.
I would not want chicken patrolling if the baby/toddler may also be crawling on the lawn.