Some of my guava trees this year showed changes in their leaves. Could some member help me to identify if it is a deficiency or a disease?
that looks more like deficiency to me.
what kind of soil is it in ?
container or ground ?
check the soil with your finger an inch deep...
sometimes when its hot, i will just water the top to make sure they dont try out
and wait for rain to deep water them.
often the soil can get hard and hydrophobic (repel water)
Guava are not very drought tolerant, especially in containers.
and they like a lot of organic matter in the soil
if its sandy soil, use a LOT of mulch and compost tea
or worm castings. + fish emulsion helps a bit as well.
i just repotted 4 guava, and all of them were dry and sandy
and the organic matter had been eaten up or washed out.