I am container gardening this year and have had great success and beautiful healthy plants until a few days ago. About a week ago I put cypress mulch around the plants in the containers to help hold the moisture in. Today I had aphids on one of the squash plants and I have yellow spots appearing on my cuke leaves similar to ones posted by someone else. Could the mulch be causing a problem as I had no pests or infections until I added that last week. Help!!!! My beautiful garden is at stake!!!!!.