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Natamycin, a New Postharvest Biofung...

Chen, Daniel Sungen.

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Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies./
Author:	Chen, Daniel Sungen.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	112 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-05, Section: B.
Contained By:	Dissertations Abstracts International82-05B.
Subject:	Plant pathology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28030748
ISBN:	9798684675850

Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies.
Chen, Daniel Sungen.

Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 112 p.

Source: Dissertations Abstracts International, Volume: 82-05, Section: B.

Thesis (Ph.D.)--University of California, Riverside, 2020.

This item is not available from ProQuest Dissertations & Theses.

In California, the main postharvest decay pathogens of citrus are Penicillium digitatum causing green mold and Geotrichum citri-aurantii causing sour rot. Both pathogens cause significant crop losses if fruit are not treated with fungicides. I sought to determine the efficacy of natamycin against P. digitatum and G. citri-aurantii in vitro and in fruit efficacy experiments. Natamycin is derived as a fermentation product from Streptomyces species. It is incompatible with oxidative sanitizers, thus, organic acids were tested as alternatives.The results of this dissertation have been obtained from experiments on the 1) in vitro sensitivity of seven postharvest decay fungi; 2) efficacy of natamycin with different application methods in laboratory, experimental packingline and commercial packingline settings; and 3) in vitro sanitation and compatibility of natamycin with organic acids.In vitro sensitivity studies established ranges of EC50 values for P. digitatum and G. citri-aurantii and other important decay fungi of stone and pome fruits. Distributions of EC50 values were unimodal, and no resistance was identified. Natamycin was effective in inhibiting mycelial growth of all fungi tested at a range of 0.17 to 3.20 µg/ml.In laboratory and packingline studies, natamycin reduced the incidence of green mold and sour rot of inoculated citrus fruits. Natamycin was compatible in mixtures and in sequential applications with a storage fruit coating, but not in mixtures with a packing fruit coating. Mixtures of natamycin and propiconazole in aqueous solutions or in storage fruit coatings were highly effective against both pathogens.Citric and lactic acids were tested against Escherichia coli and Pseudomonas syringae in vitro, with or without the surfactant sodium dodecylbenzenesulfonate (SDBS). P. syringae was highly susceptible to acidic conditions. E. coli was effectively sanitized by heated organic acid solutions with SDBS. In fruit studies, natamycin was compatible with citric acid and SDBS against green mold. Lower pH values and higher temperatures improved the efficacy of citric acid and SDBS as a sanitizer.In summary, this research determined baseline sensitivities of decay fungi to natamycin, optimized utilization of natamycin in a disease management program, and demonstrated effective sanitation of natamycin solutions using organic acids and surfactants.

ISBN: 9798684675850Subjects--Topical Terms:

3174872
Plant pathology.
Subjects--Index Terms:

Baseline sensitivity

Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies.
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100 1 $a Chen, Daniel Sungen. $3 3564791
245 1 0 $a Natamycin, a New Postharvest Biofungicide: Toxicity to Major Decay Fungi, Efficacy, and Optimized Usage Strategies.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 112 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-05, Section: B.
500 $a Advisor: Adaskaveg, James E.
502 $a Thesis (Ph.D.)--University of California, Riverside, 2020.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a In California, the main postharvest decay pathogens of citrus are Penicillium digitatum causing green mold and Geotrichum citri-aurantii causing sour rot. Both pathogens cause significant crop losses if fruit are not treated with fungicides. I sought to determine the efficacy of natamycin against P. digitatum and G. citri-aurantii in vitro and in fruit efficacy experiments. Natamycin is derived as a fermentation product from Streptomyces species. It is incompatible with oxidative sanitizers, thus, organic acids were tested as alternatives.The results of this dissertation have been obtained from experiments on the 1) in vitro sensitivity of seven postharvest decay fungi; 2) efficacy of natamycin with different application methods in laboratory, experimental packingline and commercial packingline settings; and 3) in vitro sanitation and compatibility of natamycin with organic acids.In vitro sensitivity studies established ranges of EC50 values for P. digitatum and G. citri-aurantii and other important decay fungi of stone and pome fruits. Distributions of EC50 values were unimodal, and no resistance was identified. Natamycin was effective in inhibiting mycelial growth of all fungi tested at a range of 0.17 to 3.20 µg/ml.In laboratory and packingline studies, natamycin reduced the incidence of green mold and sour rot of inoculated citrus fruits. Natamycin was compatible in mixtures and in sequential applications with a storage fruit coating, but not in mixtures with a packing fruit coating. Mixtures of natamycin and propiconazole in aqueous solutions or in storage fruit coatings were highly effective against both pathogens.Citric and lactic acids were tested against Escherichia coli and Pseudomonas syringae in vitro, with or without the surfactant sodium dodecylbenzenesulfonate (SDBS). P. syringae was highly susceptible to acidic conditions. E. coli was effectively sanitized by heated organic acid solutions with SDBS. In fruit studies, natamycin was compatible with citric acid and SDBS against green mold. Lower pH values and higher temperatures improved the efficacy of citric acid and SDBS as a sanitizer.In summary, this research determined baseline sensitivities of decay fungi to natamycin, optimized utilization of natamycin in a disease management program, and demonstrated effective sanitation of natamycin solutions using organic acids and surfactants.
590 $a School code: 0032.
650 4 $a Plant pathology. $3 3174872
650 4 $a Botany. $3 516217
650 4 $a Food science. $3 3173303
650 4 $a Horticulture. $3 555447
650 4 $a Agricultural engineering. $3 3168406
653 $a Baseline sensitivity
653 $a Fungicide
653 $a Natamycin
653 $a Organic acid
653 $a Resistance
653 $a Sanitation
653 $a Penicillium digitatum
653 $a Green mold
653 $a Sour rot
653 $a In vitro
653 $a Escherichia coli
653 $a E. coli
653 $a Decay fungi
653 $a Fermentation
653 $a Streptomyces
653 $a Stone fruits
653 $a Pome fruits
690 $a 0480
690 $a 0359
690 $a 0309
690 $a 0517
690 $a 0471
710 2 $a University of California, Riverside. $b Plant Pathology. $3 1684884
773 0 $t Dissertations Abstracts International $g 82-05B.
790 $a 0032
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28030748