With high temperatures, southern blight caused by Scleratium rolfsii can be a problem. Look for heavy white fungal growth at the soil line if the plant is wilted and not recovering. They can be white, cream or tan and usually very numerous. In the landscape, the best thing to do is to remove and destroy the plant and take the fungus with it. If we get some showers that break the heat, look for slime molds and other fungi to appear in mulched beds.
Slime molds look like dog vomit and can be white to cream colored as well as yellow and pink.
They are harmless and can be removed with a rake or squirt from a hose. The gray slime molds can be seen in home lawns after showers and are also harmless. Recently I noticed that bacterial leaf spot of zinnia was present in a bed of zinnias. This common bacterial disease is primarily seedborne, but can overwinter in old infected leaves. The small angular spots with yellow borders can progress from the lower leaves and cause extensive defoliation if ample rainfall and overhead watering splash the bacteria onto the upper leaves.