MULCH EFFECTS ON AVOCADO ROOT ROT

Abstract Hass avocado on three types of rootstock (Duke 7, Thomas, and Toro Canyon) and Zutano seedlings were planted in root rot infested soil and treated (or untreated) with mulch, Aliette or gypsum, as well as all possible combinations. Toro Canyon rootstocks produced the largest trees, Duke 7 the smallest. Mulch and gypsum did not affect tree size, however Aliette stimulated tree growth. Mulched trees had increased diseased symptoms while Aliette-treated trees were less symptomatic. Gypsum had no effect on disease ratings