My basil plants started getting a yellow cast to the leaves, which then turned brown and fell off a few days later. Basil has always been easy for me to grow. I am wondering what this problem is an… ...

Downy mildew is a fungus and one that only goes after one particular flower. "If you have got any other types of plants, you don't have to worry. It is just focusing on this type of impatien.

Downy mildew, which looks strikingly similar to black spot, can become an increasing problem. “People are confusing them,” he said. “It’s difficult to tell the two apart.” ...