How do I get rid of, or prevent, what looks like "Black Mildew" on the leaves of a patio or house plant ,I think is called a "Spider Plant"? It has long thin green & white leaves with shoots that have baby plants at the end. One large plant has spots & groups of black sticky stuff. It is starting to spead all over the main plant & it's 'babies'. Will it spead to my other patio plants like "Geraniums"? I am just starting to learn to grow some easy [ beginner ] patio & house plants.
Thanks, Cmmclarke