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Pathogenicity of nectriaceous fungi on avocado in Australia

Parkinson, Louisamarie and Shivas, Roger and Dann, Elizabeth (2017) Pathogenicity of nectriaceous fungi on avocado in Australia. Phytopathology . ISSN 0031-949X

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Article Link(s): https://doi.org/10.1094/PHYTO-03-17-0084-R

Abstract

Black root rot is a severe disease of young avocado trees in Australia causing black necrotic roots, tree stunting, and leaf drop prior to tree death. Nectriaceous fungi (Nectriaceae, Hypocreales), are commonly isolated from symptomatic roots. This research tested the pathogenicity of 19 isolates from Calonectria, Cylindrocladiella, Dactylonectria, Gliocladiopsis, and Ilyonectria, spp. collected from young avocado trees and other hosts. Glasshouse pathogenicity tests with ‘Reed’ avocado (Persea americana) seedlings confirmed that Calonectria ilicicola is a severe pathogen of avocado, causing stunting, wilting, and seedling death within 5 weeks of inoculation. Isolates of C. ilicicola from peanut, papaya, and custard apple were also shown to be aggressive pathogens of avocado, demonstrating a broad host range. An isolate of a Calonectria sp. from blueberry and avocado isolates of Dactylonectria macrodidyma, D. novozelandica, D. pauciseptata, and D. anthuriicola caused significant root rot but not stunting within 5 to 9 weeks of inoculation. An isolate of an Ilyonectria sp. from grapevine closely related to Ilyonectria liriodendri, and avocado isolates of Cylindrocladiella pseudoinfestans, Gliocladiopsis peggii, and an Ilyonectria sp. were not pathogenic to avocado.

Item Type:Article
Business groups:Biosecurity Queensland
Keywords:Dactylonectria novozelandica, Dactylonectria pauciseptata, Ilyonectria liriodendri.
Subjects:Plant culture > Food crops
Plant culture > Fruit and fruit culture
Plant pests and diseases > Plant pathology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Deposited On:17 Jan 2018 01:11
Last Modified:17 Jan 2018 01:13

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