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Plants 2017, 6(4), 51;

Effects of Silicon Amendment on Soilborne and Fruit Diseases of Avocado

Queensland Alliance for Agriculture and Food Innovation, University of Queensland, Brisbane, QLD 4072, Australia
Current address: New South Wales Department of Primary Industries, Narrabri, NSW 2390, Australia
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 16 October 2017 / Accepted: 16 October 2017 / Published: 20 October 2017
(This article belongs to the Special Issue Practical Use of Si to Influence Plant Production)
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The effects of silicon (Si) amendment have been studied in several plant/pathogen interactions; however, studies in horticultural tree crops are limited. Effects of amendment with soluble potassium silicate (AgSil®32, approximately 30% available Si), or milled cement building board by-products (Mineral Mulch (MM) or Mineral Dust (MD), containing 5% available Si) were investigated in field and greenhouse trials with avocado. Orchard soil drench applications with potassium silicate improved yield and quality of fruit, but visual health of trees declining from Phytophthora root rot (PRR) was not affected. Orchard spray or trunk injection applications with potassium silicate were ineffective. Amendment of potting mix with MM and MD reduced root necrosis of avocado seedlings after inoculation with Calonectria ilicicola, an aggressive soilborne pathogen causing black root rot. Application of MM to mature orchard trees declining with PRR had a beneficial effect on visual tree health, and Si accumulation in leaves and fruit peel, after only 10 months. Products that deliver available Si consistently for uptake are likely to be most successful in perennial tree crops. View Full-Text
Keywords: Phytophthora; potassium silicate; available silicon; anthracnose; stem end rot Phytophthora; potassium silicate; available silicon; anthracnose; stem end rot

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Dann, E.K.; Le, D.P. Effects of Silicon Amendment on Soilborne and Fruit Diseases of Avocado. Plants 2017, 6, 51.

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