Garden Pests and Diseases: Something horrible in my flower bed! Please help!, 4 by donnacreek

donnacreek wrote:
Up until last week my ornamentals were thriving. Then I started noticing a few brown spots on my zinnia leaves. I thought my husband might have oversprayed weed killer onto them but then I noticed it had spread onto my morning glory. In the last two days it appears to have infected my whole flower bed! My calla lily was fine yesterday but now looks awful! I am fairly new at this and have no idea what is happening. I am just sick about it. I hope whatever it is has not infected the soil. Any suggestions?