Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy

Correct identification of both the target insect pests and their natural enemies is important in biological control management programs. In the recent coconut scale insect (CSI) outbreak in the Philippines, misidentification of the destructive pest population resulted to an unsuccessful biological c...

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Main Author: Serrana, Joeselle M.
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Language:English
Published: Animo Repository 2016
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Online Access:https://animorepository.dlsu.edu.ph/etd_masteral/5710
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Institution: De La Salle University
Language: English
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spelling oai:animorepository.dlsu.edu.ph:etd_masteral-125482021-02-03T03:06:37Z Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy Serrana, Joeselle M. Correct identification of both the target insect pests and their natural enemies is important in biological control management programs. In the recent coconut scale insect (CSI) outbreak in the Philippines, misidentification of the destructive pest population resulted to an unsuccessful biological control application. The present study aims to examine scale cover of three Aspidiotus species previously reported in the Philippines, the CSI species - A. destructor Signoret and A. rigidus Reyne, including the oleander scale A. nerii Bouche at higher magnification using scanning electron microscopy (SEM) to validate the difference in scale cover thickness reported in previous literatures. SEM observations revealed that A. destructor Sign. and A. rigidus Reyne scale cover are similar ultrastructurally. A multivariate analysis of covariance indicates no significant difference between the thickness of the three Aspidiotus spp. along five points in the mid-section of the scale cover while controlling scale cover length as covariance (Pillais Trace = 0.980; p-value = 0.789 > 0.05). Additionally, a comparative observation of the ovipositor of the hymenopteran parasitoids directly associated with the two CSI species was done to provide structural evidence that links ovipositor structure to host specificity. The aphelinid wasp Aphytis lingnanensis Compere parasitizing A. destructor Sign. is an ectoparasitoid was observed to have a very sharp and slender ovipositor with a simple pointed tip which is suitable to avoid puncturing or drilling through the fragile cuticle of its host. The encyrtid wasp C. calauanica Barrion, Almarinez & Amalin is an endoparasitoid with a characteristically pointed but strongly dented, with serrated distal teeth useful for drilling through the integument of the host. The structure of the ovipositor tip of the hymenopteran parasitoids directly associated with the two CSI species examined under SEM are congruent with their mode of parasitization. 2016-01-01T08:00:00Z text https://animorepository.dlsu.edu.ph/etd_masteral/5710 Master's Theses English Animo Repository Insect pests--Biological control
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
language English
topic Insect pests--Biological control
spellingShingle Insect pests--Biological control
Serrana, Joeselle M.
Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
description Correct identification of both the target insect pests and their natural enemies is important in biological control management programs. In the recent coconut scale insect (CSI) outbreak in the Philippines, misidentification of the destructive pest population resulted to an unsuccessful biological control application. The present study aims to examine scale cover of three Aspidiotus species previously reported in the Philippines, the CSI species - A. destructor Signoret and A. rigidus Reyne, including the oleander scale A. nerii Bouche at higher magnification using scanning electron microscopy (SEM) to validate the difference in scale cover thickness reported in previous literatures. SEM observations revealed that A. destructor Sign. and A. rigidus Reyne scale cover are similar ultrastructurally. A multivariate analysis of covariance indicates no significant difference between the thickness of the three Aspidiotus spp. along five points in the mid-section of the scale cover while controlling scale cover length as covariance (Pillais Trace = 0.980; p-value = 0.789 > 0.05). Additionally, a comparative observation of the ovipositor of the hymenopteran parasitoids directly associated with the two CSI species was done to provide structural evidence that links ovipositor structure to host specificity. The aphelinid wasp Aphytis lingnanensis Compere parasitizing A. destructor Sign. is an ectoparasitoid was observed to have a very sharp and slender ovipositor with a simple pointed tip which is suitable to avoid puncturing or drilling through the fragile cuticle of its host. The encyrtid wasp C. calauanica Barrion, Almarinez & Amalin is an endoparasitoid with a characteristically pointed but strongly dented, with serrated distal teeth useful for drilling through the integument of the host. The structure of the ovipositor tip of the hymenopteran parasitoids directly associated with the two CSI species examined under SEM are congruent with their mode of parasitization.
format text
author Serrana, Joeselle M.
author_facet Serrana, Joeselle M.
author_sort Serrana, Joeselle M.
title Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
title_short Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
title_full Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
title_fullStr Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
title_full_unstemmed Comparative ultrastructure of the scale cover of three aspidiotus spp. (Hemiptera: Diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
title_sort comparative ultrastructure of the scale cover of three aspidiotus spp. (hemiptera: diaspididae) and the ovipositor of their two parasitoids usign scanning electron microscopy
publisher Animo Repository
publishDate 2016
url https://animorepository.dlsu.edu.ph/etd_masteral/5710
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