Saving a 40-Year-Old Avocado Tree with Poor Fruit and Dying Limbs

Your mature avocado tree bears few fruits, shows yellowing and browning leaves, and has at least one dying limb. You want to know if it's salvageable and what fertilizer to use.

Start with Pruning and Diagnosis

Remove any dead or dying limbs immediately—cut back to healthy wood. This prevents pathogens from spreading to the main trunk. The fruit issues are hard to diagnose from photos alone; compare symptoms to the UC IPM avocado problem gallery: UC IPM Avocado Pests.

Don't Guess at Fertilizer—Test the Soil

Blind fertilizing can do more harm than good. A soil test ($10–20) reveals exactly what nutrients are lacking. Sample soil 6+ inches deep from several spots around the tree, mix in a bucket, and send a pint to your county extension office. They'll provide specific amendment recommendations.

Get Local Expert Help

Your county extension office is the best resource. They know regional diseases, pests, and soil conditions. Find yours at UC IPM County Offices. Bring them a sample—leaves, fruit, or a small branch—for accurate diagnosis.

A 40-year-old tree is worth the investment in proper testing and expert advice. With targeted care, it can recover and produce better crops.