While the list of diseases (wilt, blight, leafspot, rust) and pests (rose chafer, scale, mites and nematodes) seems daunting, I would tell you I have never actually seen any of these, and don't expect to.
Whether they are Japanese, cucumber, or rose chafer beetles, a squirt with a pesticide of your choice and discretion kills 'em dead if you get it right on their little personages, but it doesn't have much residual effect.
At some point, every rose gardener will encounter black spot, Japanese beetles, rose chafers and mildew. Don't let that deter you from rose gardening. It is possible to control problems or to avoid them all together.
Adult feeding mimics damage caused by rose chafer and other skeletonizing beetles.
Plants attacked: More than 300 species of flowers, trees and shrubs.
Management strategies: Birds and toads help keep these insects under control.
Befriending Bumble Bees
Cutworms in Home Gardens
European earwigs in homes and gardens
Flea Beetles in Home Gardens
Honey Bee Diseases and Pests
Insect Pests of Roses
Rose Chafers
Springtails
Successful Queen Rearing ...
 See also: Rose, Chafe, Plant, Flower, Insect
  
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