Around 2 months ago, I planted a single Zinnia seed in a pot because all the other plants were eaten by an unidentified organism. It was initially doing fine, and now it currently has its second set of true leaves, but 2 weeks ago, I noticed to tips of the first set of true leaves was starting to turn black. IN a panic, I thought the best thing to do was to cut off the black part. I did that, and its turning black, and now the newest set of true leaves are trying black, and have little holes in them. What should I do???
Treat the plant with Neem Oil. Neem Oil works as both an insecticide and fungicide.