Has some similar symptoms to some citrus trees I worked on here not long ago.
The soil should be moist, not wet, pull the mulch back a bit from the trunk of the tree too. Dig a small hole with a hand trowel and see what the soil moisture is like. If you encounter small roots see if they feel moist rather than dry.
Also when you have dug your little hole pour some water in it and see what happens, how fast it drain or if the water just sits, look at the edges where the water meets the soil, see if the soil is repelling water or beading the water up.
The trees I worked on were way out on the soil pH so test it, test kits are pretty cheap these days, test at various depths.
Also looks too light in colour, should be darker green, dont go fertilizer crazy though, use organic fertilizer with trace elements (not that white powdery chemical stuff) and maybe some wetting agent.
I'd spray with a copper based fungicide and some confidor, hard to tell from the pics but looked like some scale on the leaves, I dont like using white oil on trees coz it can burn in hot sun and you should really hose it off. No spraying when it's going to get over 30C OK! Spray at dawn or dusk. |