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118015

CHLOROPHYLL LOSS PERCENTAGE AS INDICATOR FOR CALCULATING ECONOMIC THRESHOLD AND ECONOMIC INJURY LEVELS OF PARLATORIA ZIZIPHI (LUCAS) ON NAVEL ORANGE LEAVES

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Last updated: 26 Dec 2024

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Abstract

Thisstudy was carried out in Scale Insects and Mealybugs Department, Plant Protection Research Institute, Sharkia Branch, ARC, Egypt from May to September 2017 on navel orange leaves infested with the Parlatoria black scale, Parlatoria ziziphi (Lucas) to calculate economic threshold and economic injury levels depending on the loss of leaves chlorophyll content. Simple correlation and partial regression were calculated between numbers of insect and chlorophyll loss percentage in infested and uninfested units (inch2). Positive highly significant correlation was recorded between numbers of insect and percentage of chlorophyll loss. Chi-square (X2) was used to calculate economic threshold and economic injury levels of P. ziziphi that causes economic damage in disk chlorophyll content which were 9 and 14 individuals per inch2, respectively.

DOI

10.21608/mjapam.2019.118015

Keywords

Sap-sucking, hemipterans, Parlatoria black scale, Chlorophyll, Simple correlation, partial regression

Authors

First Name

H. A.

Last Name

Nabil

MiddleName

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Affiliation

Plant Protection Research Institute, ARC, Dokki, Egypt

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Orcid

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Volume

4

Article Issue

3

Related Issue

17758

Issue Date

2019-06-01

Receive Date

2020-10-10

Publish Date

2019-06-01

Page Start

93

Page End

98

Print ISSN

2357-0776

Online ISSN

2735-3494

Article File

MJAPAM_Volume 4_Issue 3_Pages 93-98.pdf

PDF . 125.1kB

Link

https://mjpam.journals.ekb.eg/article_118015.html

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https://mjpam.journals.ekb.eg/service?article_code=118015

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5

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Original Article

Type Code

1,417

Publication Type

Journal

Publication Title

Menoufia Journal of Plant Protection

Publication Link

https://mjpam.journals.ekb.eg/

MainTitle

CHLOROPHYLL LOSS PERCENTAGE AS INDICATOR FOR CALCULATING ECONOMIC THRESHOLD AND ECONOMIC INJURY LEVELS OF PARLATORIA ZIZIPHI (LUCAS) ON NAVEL ORANGE LEAVES

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Article

Created At

23 Jan 2023