Lemon Tree Yellowing Leaves: Frost, Aphids, or Both?

Check Recent Weather and Insects

Lemon tree in Sacramento yellowing and dropping leaves while nearby citrus are fine. Two main suspects:

1. Warm spell then freeze – common spring damage pattern.
2. Aphids – check leaf undersides for tiny green/brown insects.

Action

• If aphids: spray horticultural soap/oil.
• Either way: maintain regular citrus fertilization and watering.
• Tree will replace lost leaves if roots are healthy.