Japanese Beetles are here

Last week I released Preying Mantis in one bed and there seem to be less Beetles than in the bed where no Preying Mantis were released. Today I dusted the roses with diatomaceous earth and 6 hours later the Bettles still seem to be thriving, eating and multiplying inside the flowers. Now at dusk, I will try to pick them off one by one and see if there is a fresh army of Beetles tomorrow. The Beetles seem to prefer pink rugosa over all else. Not many beetles were found on the meidiland, pavement, or knockouts, maybe because they are hybrids.