There are many insects that are harmful to rose bushes. They include Japanese beetles, aphids, oat bugs and cane borers. Many homeowners are hesitant to use chemical insecticides around their home, especially if they have pets and small children. Luckily, there is an excellent alternative. You can make your own insecticide at home that will kill any insects that are attacking your rose bushes.
Pour 1 gallon hot water into your garden sprayer.
Add 2 tbsp. liquid castile soap, and mix until combined.
Top off with 1 cup isopropyl alcohol. Mix again, and place the top back on the garden sprayer.
Spray any rose bushes that you find insects on. You can be generous with the homemade insecticide as it will not harm your roses.
Repeat once every two weeks to keep any new insects from attacking your rose bushes.