Article: Evaluation of fludioxonil and azoxystrobin for the postharvest control of Phytophthora brown rot on citrus Journal: International Journal of Postharvest Technology and Innovation (IJPTI) 2023 Vol.9 No.1 pp.72 - 92 Abstract: This research aimed to evaluate the in vitro sensitivity of P. nicotianae isolates towards azoxystrobin and fludioxonil. Additionally, the curative and protective efficacy of these fungicides in aqueous postharvest treatments against Phytophthora brown rot was evaluated. Azoxystrobin- and fludioxonil-amended wax were further evaluated for the prevention of brown rot spreading within export cartons. For both fungicides, previously unexposed and exposed populations were divided into different fungicide sensitivity groups. Groups were statistically different based on EC50 and EC90 values. The fungicides had good curative action with applications 12 hours after inoculation. Applications 24 hours after inoculation also provided some curative action but not as effective as earlier applications. Azoxystrobin provided very good protection with inoculations up to 48 hours after application. Fludioxonil did not perform as well. Trials aimed at preventing disease spread during transit indicated that only azoxystrobin-amended wax prevented brown rot from spreading to healthy fruit. Inderscience Publishers - linking academia, business and industry through research

Title: Evaluation of fludioxonil and azoxystrobin for the postharvest control of Phytophthora brown rot on citrus

Authors: Elizabeth van der Merwe; Cheryl Lennox; Jan M. van Niekerk

Addresses: Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa ' Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa ' Citrus Research International, P.O. Box 28, Nelspruit 1200, South Africa

Abstract: This research aimed to evaluate the in vitro sensitivity of P. nicotianae isolates towards azoxystrobin and fludioxonil. Additionally, the curative and protective efficacy of these fungicides in aqueous postharvest treatments against Phytophthora brown rot was evaluated. Azoxystrobin- and fludioxonil-amended wax were further evaluated for the prevention of brown rot spreading within export cartons. For both fungicides, previously unexposed and exposed populations were divided into different fungicide sensitivity groups. Groups were statistically different based on EC₅₀ and EC₉₀ values. The fungicides had good curative action with applications 12 hours after inoculation. Applications 24 hours after inoculation also provided some curative action but not as effective as earlier applications. Azoxystrobin provided very good protection with inoculations up to 48 hours after application. Fludioxonil did not perform as well. Trials aimed at preventing disease spread during transit indicated that only azoxystrobin-amended wax prevented brown rot from spreading to healthy fruit.

Keywords: Phytophthora nicotianae; fungicides; postharvest management; Phytophthora brown rot; azoxystrobin; fludioxonil; protective control; curative control; in vitro sensitivity.

DOI: 10.1504/IJPTI.2023.136337

International Journal of Postharvest Technology and Innovation, 2023 Vol.9 No.1, pp.72 - 92

Received: 23 Nov 2022
Accepted: 29 Aug 2023
Published online: 30 Jan 2024 *

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Title: Evaluation of fludioxonil and azoxystrobin for the postharvest control of Phytophthora brown rot on citrus

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