Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Coccoidea"”.
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The armored scale insects of Venezuela (Homoptera: Coccoidea: Diaspididae)
Scale insects are among the most serious plant pests throughout the world. The Diaspididae is the largest scale insect family and probably the most important economically. No comprehensive taxonomic study dealing with the scale insects of Venezuela has been conducted in the past. Forty-nine species …
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Morphological and biological studies on two species of Chionaspis (Homoptera: Coccoidea: Diaspididae)
Morphological studies in the past have been almost exclusively confined to the description and illustration of adult females. Morphological studies of Diaspididae were further restricted to the pygidial area. This study is an attempt to provide complete descriptions, illustrations, and measurements …
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Morphology and systematics of the adult females of the genus Lecanodiaspis (Homoptera: Coccoidea: Lecanodiaspididae)
In the past, the systematics of species in the genus Lecanodiasuis has been chaotic. This study is an attempt to clarify the classification of this group. Forty-eight species are included in this paper; six of these are new species and described for the first time. Adult females of thirty-two …
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Biosystematics of the genus Chionaspis (Homoptera, Coccoidea, Diaspididae) of North America, with emphasis on polymorphism
The scurfy scales in the genus Chionaspis comprise a unique taxon among the armored scale insect genera in North America. The taxonomic reviews of the species belonging to the genus by Cooley (1899) and Ferris (1937, 1942) are far outdated. The present research is a comprehensive review of all the …
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A morphological and systematic study of the first and second instars of the Kermesidae in the Nearctic region (Homoptera: Coccoidea)
The Cocco idea or scale insects are among the most important pests of sylvicultural, ornamental, agricultural and greenhouse plantings throughout the world. There are 21 families comprising 6,000 species. Direct injury occurs from the withdrawal of sap while feeding and from the production of …
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The morphology, biology and control of Ceroplastes ceriferus (Fabricius) and Ceroplastes sinensis Del Guercio in Virginia including a redescription of Ceroplastes floridensis Comstock (Homoptera: Coccoidea: Coccidae)
Populations of the wax scales, Ceroplastes ceriferus (Fabricius) and Ceroplastes sinensis Del Guercio, have become established in Virginia. A third species, Ceroplastes floridensis Comstock, is periodically brought into the state but is apparently unable to overwinter. Ceroplastes ceriferus the …
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Survey of different mealybug species and attending ants and their management in Virginia vineyards
Mealybugs (Order Hemiptera: Superfamily Coccoidea) represent a persistent problem in grape-growing regions globally, with a notable increase in infestations in recent times. The current study investigates the species composition and seasonal dynamics of mealybugs in vineyards. Pseudococcus …
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Current status of the scale insect fauna of citrus in Tunisia and biological studies on Parlatoria ziziphi (Lucas)
… The Tunisian scale insect fauna (Hemiptera: Coccoidea), is among the poorly studied fauna in the world. Actually, populations of some species have increased to pest status in many crops and the black scale Parlatoria ziziphi Lucas (Hemiptera: Diaspididae) is one of the most important insect …
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Asociación cecropia spp (cecropiaceae)-azteca spp (formicinae: dolichoderinae) en la reserva laguna El Tabacal, municipio de La Vega, Cundinamarca
Se desconocen muchos de los aspectos de los efectos del hábitat sobre las asociaciones, las identidades de las mismas y las implicaciones de las características morfológicas de las plantas en las hormigas. La asociación Cecropia- Azteca se presenta en los andes suramericanos, sin embargo los …