Don't worry. They are just resting up a bit and will take off soon displaying lots of blooms. A number of my roses "rest" in mid-June (I'm Zone 6 also--but in the midwest), and I notice my neighbor's big Knock Out just started blooming again this past week. Kate

Ok i have a petite pink drift knockout.. which after replanting to a pot developed a similar sounding problem…first off i realized pot was not draining well so took it out of the pot washed off roots and repotted with new soil. trimmed the branches that had curling leaves back, used Bayer 3 in one fertilizer, antifungal, insecticide granules and worked into soil around base and watered from under foliage. repeated again this season and noticed same with curling leaves and shimmery white coating as well. i cut it back leaving only healthy clear stems and leaves..removed all debris off soil and bagged and tossed. reapplied Bayer and its looking much better. I’ll give it one more season before I rip it out! 😂👍

Probably fall is not the time to apply granules. I am not an expert on this, but I believe the recommendation is to apply granules at bud-break in spring. The midge pupa overwinter in the soil in cocoons. Only a small percentage survive winter and emerge as winged adults, which fly up to lay eggs on the new shoots. These hatch into tiny maggots which do the damage. There are several generations per season, each larger than the previous. After feeding for a couple of weeks, the maggots drop off to pupate in the soil, at which time they are vulnerable to insecticide in the soil. You can also spray the top growth to catch the active larvae. Recommended chemicals are imidacloprid for the soil and cyfluthrin for the spray. These names appear in the fine-print active ingredients, regardless of brand names. "Merit" is a brand name for imidacloprid.

My climate is not anything like yours (I live in eastern Washington) but I have had good luck with old fashioned shrub roses (mainly once blooming) and some hybrid musks and polyanthas (repeat blooming). I do have two yellow knock out roses (from Lowe's sale) with pink edges...and they fade to an ivory as they age. They're very pretty and I really like them. I think they look great, mixed in with lavender and pink perennials...and maybe cosmos and stock (annuals). Celsiana is one of my favorite old fashioned shrub roses. It's a damask and it blooms for a long time...four to six weeks. Here's a picture (not mine) that inspired me to get Celsiana. From Lavender's Garden Echo (Baby Tausendschon) from Rogue Valley Roses is a pretty little rose, too. I don't know how it is with humid conditions, but it does very well, in my garden. This is my picture :) From Lavender's Garden