Many WSU demonstration gardens do not set out these plants until the beginning of June. Leaf rollers are caterpillars that roll up into leaves for protection during the day, then move out at night to feed on nearby foliage. The damage is mostly aesthetic. It's not eating your plants. It's eating what's eating your plants.
Beetles eat all kinds of insects, even slugs.
If you kill them, you have to take over their job. Leaves on rhododendrons that turn yellow with green veins may indicate that the soil is too alkaline or is draining poorly. Spray the leaves with iron sulfate or chelated iron, available in garden stores. Sprinkle the soil with a solution of epsom salts. Let some of your radishes grow to seed.