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Even with watering everyday, they are still not getting enough water. In heat like that, you will want to water twice a day and water the pot for several minutes to make sure it is thoroughly soaked.

Please check this url for more detailed information for what appears to be insect pests (you cannot always see them with the naked eye, btw) But they can be controlled.

http://gardening.yardener.com/YardenersPlantHelper/LandscapePlantFiles/FilesAboutFlowers/FlowersAnnuals/Marigold/SolvingMarigoldProblems

Regards,
doccat5

Pinch off or cut off all spent flowers. This is called deadheading. You are removing the finished product (seeds) and the plants think they have completed their growth cycle. If deadheaded, they will produce new flowers.I don't use chemicals so can't help you re Sevin dust. A person kills all the beneficial bugs that often take care of the bad guys and my personal feeling is that chemical use can just cause a new set of problems to the garden and our environment. Marigolds are seldom bothered by any insects.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/keeping-ants-of-flowering-vines-vegetables-and-flowers.htm

You don't mention where you live or current weather conditions. If you do not disturb the roots, they will probably do okay. When I transplant in less than ideal situations, I dig a big hole, then dig the plant with a big shovel and take as much soil as possible. I place the transplant and soil in previously made hole and fill the old hole with the soil from the new transplant spot. Water well.

Any of the African or French scented Marigolds act as an insect repellent. I use marigolds all over my garden for that reason. But you do need to make sure you have picked a variety that has scent! Some of the newer hybrids are scentless, pretty but not particular practical for that use.