What's your question? Ask

I would stick with feeding your roses a well balanced fertilizer. The Dr. Earth would be okay since it is relatively low on the nitrogen end. Rosebushes not bloom can be caused by high nitrogen fertilizers which encourage more foliage growth and few to no blooms. It can also be caused by too much shade and not enough good sunlight. At least 6 hours of good sunlight is needed. It can also be caused by tiny pests that get at the buds in their smallest of form and thus cause them to fall off. It may be time to try a systemic approach and see if that allows the buds to form and blooms to come. I would try treating all the rosebushes with some Bayer Tree & Shrub Granules. Apply per the label instructions for Ornamentals/Roses. It has some food in with it for the roses to help give them strength too. After that treatment, in about two weeks, water all the rosebushes with some water that has a product called Super Thrive in the water. The super thrive provides great vitamins and hormones for the rosebushes overall health that will encourage bloom production.

It could be a heat stress issue and the rosebushes cannot get enough water into the petals fast enough to deal with the heat. It can also be an insect laying eggs in the petals and stinging the petals with a substance that makes them curl to help protect the eggs. Open some of the curled petals up and see if there are any little bugs or eggs in there. If there are, then a systemic insecticide that moves up through the root system and into the natural juices of the rosebushes may be in order.

It surely does sound like you have some Thrips getting after your rosebushes. I would give them all a spraying with some Bayer Advanced Complete Insecticide. Then in a couple days give them all a treatment of Bayer Tree & Shrub granules per the label instructions for shrubs/ornamentals, work it into the soils lightly and water in well. This product has both a feed in it for the roses to help them gain strength but also a systemic insecticide that moves through the rosebushes natural juices to get after those hard to kill and find insects. Here is an article on thrips for you to check out as well: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-thrips.htm

Knockout roses are what is termed "self-cleaning" roses thus they do not need to be deadheaded to re-bloom. As a matter of fact dead-heading them is highly discouraged as in doing so one may prune off some already developing growth that will become new blooms. I typically just pull off the old petals to keep things looking more tidy and leave the rest there on the bush. Keep them well watered and fed and enjoy the bloom shows. The Home Run rosebushes from Weeks Roses are also in the self-cleaning group. Here is a link to an article for you as well: https://www.gardeningknowhow.com/ornamental/flowers/roses/self-cleaning-roses.htm

Give them a treatment of Bayer Tree and Shrub granules per the label instructions for shrubs/ornamentals. Water it in well. Then in about 4 to 5 days water them with some water that has both a root stimulator and a product called Super Thrive in it. This should get things going and taken care of.

It is likely a little beetle that is doing the damage. I would give the roses a treatment of Bayer Tree & Shrub Granules. The systemic in the product will take care of the issues.