How To Manage 5-months Old Seedling Of Mango If It Has Disease?

Question

I planted the seedling of Mango, which I propagated from seed. It is 5 months old and I have following questions: 1. Should I remove the old cotyledons from the seedling in case if seedling is 5 months old? 2. How deep should be the pot for 5-months old seedling? 3. What king of soil it should to be in the pots and should I use the fertilizers? 4. On the leaves appeared the black-brown spots (look on my pictures). What kind of mango diseases it is and how to manage it?

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Answer 1

yes, you can remove the old cotyledons. The soil should be well-draining potting soil. It looks like you have garden soil, which may promote disease. It looks like you have insect activity.
https://www.gardeningknowhow.com/edible/fruits/mango/mango-trees-in-pots.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm