I am noticing some black beetle looking pests on my roses and im trying to find out how to prevent them from destroying my rose plants as they are swarming them and destroying their petals and stems.. here is a picture of what they look like.
Just identifying on the fact that it is shiny, and has three segments on the end of the antennae.
Not sure what they are doing there.
According to the US National Library of Medicine within the National Institutes of Health, as published on the Zookeys site ('Life history and biology' section, emphasis mine):
Immature life stages are known for only a handful of the pelidnotine genera including Homonyx, Chrysophora, and Pelidnota. Based on life history studies, life cycles are one to two years in duration. Larvae are sapro-xylophagous and feed on dry, rotten wood (Pelidnota virescens), hollow trunks and tree stumps (Pelidnota punctata; Epichalcoplethis velutipes), organic matter in the soil, and rotten roots. One species, Pelidnota filippiniae is a significant defoliator and high numbers could contribute to plantation damage.
I think the last named species is Asian, probably found in the Philipines, given its specific name.
It doesn't sound like the large fellows in the photo will defoliate the plant or harm any plant roots. I think they were probably there because they'd just begun their adult life cycle.