11. Liles said his precious avocado trees were protected by firefighters from the California Department of Forestry. 12. The amount ( titre ) of viroid particles present in avocado trees varies a great deal. 13. The Avocado tree is very reliable in subtropical climates which suited perfectly to the Mayan civilization. 14. On 21 January 1950, he sustained serious injuries in a fall from an avocado tree . 15. Avocado trees are partially propagated through grafting to maintain a predictable quality and quantity of the fruit.16. In the 1940s, Mexico State governor Wenceslao Labra introduced 300, 000 avocado trees to the area. 17. The house is a big improvement over the one that used to stand there under the massive avocado trees . 18. One recent afternoon, the sun was warm, beckoning the neighborhood to the boughs of the avocado tree . 19. Avocado trees require frequent, deep watering to bear optimally, particularly in spring, summer, and fall.20. Avocado trees are vulnerable to bacterial, fungal, and nutritional diseases ( excesses and deficiencies of key minerals ).
