Q: I planted two new four-foot avocado trees in the last two weeks. Some of the leaves are turning brown and falling off. I am in zone 9. I am hand watering twice a week with two gallons of water per ...

If you have an avocado tree growing in your backyard, you need to be vigilant about a disease that has made a comeback and can destroy your fruit. It's called Sunblotch Viroid, a microscopic invader ...