Hey peeps, tried to upload some pictures of the problem but have some problems with that. I recently planted apple seeds, and have had healthy apple seedlings for about a month, until now; some sections of the leaf have turned ash-black, and on the corners of some leaves there is an orange tinge, as though the leaf is rusted. I have yet to give them any fertilizer or any solutions for pest prevention, I suspect this could be the problem. Could anyone enlighten me as to what to the problems could be? And if it is a nutrition problem, any organic alternatives to store bought fertilizers?