Do you know what this insect is?
I apologize for the 2nd reply on your question. You are based in Douglas County which is the area which I cover for ask an expert and I am very familiar with what is on your rosebush.
What you are seen is Katydid eggs and they are a very common cricket or commonly called a grasshopper in our area. There is no need to prune out the area or spray the plant with oils unless you wish to. The eggs can easily be scraped off and then disposed of. I have attached a link to a wis consen information sheet on katydid from UC Davis. For more information or any other questions please let me know.
Wendy Hanson Mazet, Extension Plant Diagnostician, firstname.lastname@example.org