Mealybugs and Red Spider mites top the list of garden enemies, and also for the indoor plants - house and greenhouse. Some of the fruit enemies are in this A - S listing - especially for Strawberries and Raspberries.
In the ornamental garden, the Rhododendrons find a few enemies on this page, or should we say that the enemies find the Rhododendrons?
Study the list, and do what you can by way of prevention of these garden pests.
More than anything, good cultivation, cleanliness and awareness are the best preventative measures. If this is unsuccessful, then correct identification before applying chemical sprays is always an essential element in pest control in the garden.