12+ Avocado Tree Leaves Brown Tips. Avocado trees, even ones in the ground, have trouble drawing up enough water and browning at the end of the leaves is very common. The most likely cause of brown leaf tips on avocado is excessive salt accumulation, although certain diseases or mineral deficiencies avocado root rot, which is caused by the pathogen phytophthora cinnamomi, appears in the tree's canopy as small, pale leaves or wilted leaves with brown tips.
The dots start small on the edges and very quickly spread over the leaf.
Usually, tip burn happens because of specific characteristics of avocado tree biology. Well, it depends on how long you've let it sit out for. This is new in the last few months. If the leaves start to turn brown or feel dry or brittle … then water the avocado tree more frequently.