I planted this amrapali mango tree last month on 22 August but till now no new leaves came and the older ones fell off. From last week there is heavy raining and now i spotted these brown spots on the leaves. What should i do ?

I planted this amrapali mango tree last month on 22 August but till now no new leaves came and the older ones fell off. From last week there is heavy raining and now i spotted these brown spots on the leaves. What should i do ?

by AltruisticNail4614