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In order to prevent these pests from reoccurring next year, it is important to eradicate them now. The best product to control any leaf eating worm or caterpillar is known as Bt (Bacillus thuringensis). And although it may sound scary, it is a naturally occurring soil bacteria that ONLY effects these sorts of insects. As for the powdery mildew, try a sulfur or copper based fungicide to combat the fungus.
Now, the most important thing you can do to protect the rest of your garden is to get these infested plants OUT! If you want to be thorough, treat the entire garden (infested or not) with both the fungicide and the Bt. Next, remove the plant material that is showing signs of infection or infestation. Keep a very close eye on the remaining plants in your garden throughout the rest of the growing season and treat plants as needed. Once the growing season comes to an end be sure to remove all remaining plant material (even weeds) before winter hits. Additionally, be sure to regularly disinfect garden tools and equipment, and do so especially after coming into contact with diseased plant materials.
There are a couple different ways in which you can dispose of these plants. Since powdery mildew spores generally do not survive long after their host plant dies, it is acceptable to add infected plant material into your compost pile. (Insect pest infested materials are good to go as well). If you do not have a compost pile, you can burn or bury the material (again, powdery mildew is ok to bury because it is not soil borne). Finally, you can always add these materials into your green waste trash bin as well