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Fruit Microbial Hygiene Associated with Mechanical Harvesting, and Injuries and Stem Blight in Relation to Mechanical Hedging and Crown Bark Inclusions in Blueberry.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fruit Microbial Hygiene Associated with Mechanical Harvesting, and Injuries and Stem Blight in Relation to Mechanical Hedging and Crown Bark Inclusions in Blueberry./
作者:	Holland, Renee Marie.
面頁冊數:	1 online resource (143 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-08, Section: B.
Contained By:	Dissertations Abstracts International83-08B.
標題:	Plant pathology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28774998click for full text (PQDT)
ISBN:	9798780615675

Fruit Microbial Hygiene Associated with Mechanical Harvesting, and Injuries and Stem Blight in Relation to Mechanical Hedging and Crown Bark Inclusions in Blueberry.
Holland, Renee Marie.

Fruit Microbial Hygiene Associated with Mechanical Harvesting, and Injuries and Stem Blight in Relation to Mechanical Hedging and Crown Bark Inclusions in Blueberry. - 1 online resource (143 pages)

Source: Dissertations Abstracts International, Volume: 83-08, Section: B.

Thesis (Ph.D.)--University of Georgia, 2021.

Includes bibliographical references

Labor constraints and cost considerations have led to increased mechanization in the blueberry industry, including the widespread use of mechanical harvesting of fruit and mechanical hedging of plants after harvest. This dissertation investigated 1) the densities of environmental and food safety indicator organisms on mechanical harvester surfaces to identify those surfaces posing the greatest risks; 2) the relative cleanability of these surfaces and the effectiveness of sanitization protocols; 3) the presence of bark inclusions at the base of newer, machine-harvestable blueberry cultivars and their effect on the relative strength of cane unions and incidence of Botryosphaeria stem blight; and 4) the efficacy of fungicides to suppress Botryosphaeria stem blight on stem wounds following hedging. Results showed that blueberry harvesters harbor high levels of environmental microbes, especially on horizontal surfaces at the bottom of the machine, and that they may increase levels of these microbes on fruit passing through the harvester. In contrast, food safety indicator organisms were only detected sporadically on harvester surfaces and fruit. In controlled experiments with mock-soiled harvester surface coupons, there was no effect of surface type or cleaning agent use on the relatively cleanability of surfaces, while hot (50oC) water removed the most mock soil. In surface sanitization experiments with three test microbes, SaniDate (23.0% hydrogen peroxide + 5.3% peroxyacetic acid) was most effective in reducing microbial counts. Bark inclusions, a structural defect at the crown of the plant, are described for the first time in southern highbush blueberry, and a correlation between external and internal assessments of bark inclusions is presented. Canes with included bark broke at lower tension forces than those without, showing a significant negative impact on cane strength. The number of bark inclusions per plant was associated with an index of cane crowding, and bark inclusion intensity correlated with Botryosphaeria stem blight intensity in field surveys. In fungicide trials to suppress Botryosphaeria stem blight on freshly hedged plants, a new humidity chamber inoculation method was used with fungi in the Botryosphaeriaeace family. Assessed up to 20 days after inoculation, thiophanate-methyl was the only fungicide to provide year-to-year efficacy in stem blight suppression.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798780615675Subjects--Topical Terms:

3174872
Plant pathology.
Subjects--Index Terms:

Bark inclusionIndex Terms--Genre/Form:

542853
Electronic books.

Fruit Microbial Hygiene Associated with Mechanical Harvesting, and Injuries and Stem Blight in Relation to Mechanical Hedging and Crown Bark Inclusions in Blueberry.
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502 $a Thesis (Ph.D.)--University of Georgia, 2021.
504 $a Includes bibliographical references
520 $a Labor constraints and cost considerations have led to increased mechanization in the blueberry industry, including the widespread use of mechanical harvesting of fruit and mechanical hedging of plants after harvest. This dissertation investigated 1) the densities of environmental and food safety indicator organisms on mechanical harvester surfaces to identify those surfaces posing the greatest risks; 2) the relative cleanability of these surfaces and the effectiveness of sanitization protocols; 3) the presence of bark inclusions at the base of newer, machine-harvestable blueberry cultivars and their effect on the relative strength of cane unions and incidence of Botryosphaeria stem blight; and 4) the efficacy of fungicides to suppress Botryosphaeria stem blight on stem wounds following hedging. Results showed that blueberry harvesters harbor high levels of environmental microbes, especially on horizontal surfaces at the bottom of the machine, and that they may increase levels of these microbes on fruit passing through the harvester. In contrast, food safety indicator organisms were only detected sporadically on harvester surfaces and fruit. In controlled experiments with mock-soiled harvester surface coupons, there was no effect of surface type or cleaning agent use on the relatively cleanability of surfaces, while hot (50oC) water removed the most mock soil. In surface sanitization experiments with three test microbes, SaniDate (23.0% hydrogen peroxide + 5.3% peroxyacetic acid) was most effective in reducing microbial counts. Bark inclusions, a structural defect at the crown of the plant, are described for the first time in southern highbush blueberry, and a correlation between external and internal assessments of bark inclusions is presented. Canes with included bark broke at lower tension forces than those without, showing a significant negative impact on cane strength. The number of bark inclusions per plant was associated with an index of cane crowding, and bark inclusion intensity correlated with Botryosphaeria stem blight intensity in field surveys. In fungicide trials to suppress Botryosphaeria stem blight on freshly hedged plants, a new humidity chamber inoculation method was used with fungi in the Botryosphaeriaeace family. Assessed up to 20 days after inoculation, thiophanate-methyl was the only fungicide to provide year-to-year efficacy in stem blight suppression.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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650 4 $a Microbiology. $3 536250
650 4 $a Horticulture. $3 555447
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653 $a Blueberry
653 $a Botryosphaeria stem blight
653 $a Cleaning and sanitization
653 $a Food safety
653 $a Mechanical harvest
653 $a Vaccinium corymbosum
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