I started out by having some apple seeds, Golden Delicious (eco/bio), in the fridge in order to germinate them. Since September (about 2 months ago ) they have been growing in smaller pots with a compost from the local store. They have grown healthy up until now and I start to see brown spots on the leaves. It seems like 2 out of 3 pots have the same thing, NOT the third one. I've spotted tiny white bugs walking around on the leaves (aphids?) so I removed them by washing them off in the sink, leaf by leaf. All three plants have stopped growing.
What could be the cause of these brown spots?
Also, it is November here in France so I didn't expect them to grow very much during winter. The plants are all indoors. Will they continue to grow? Or is this just gonna get worse so that the plants will eventually die?