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Entomology Commons™

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2009

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Articles 211 - 215 of 215

Full-Text Articles in Entomology

Describing Anopheles Arabiensis Aquatic Habitats In Two Riceland Agro-Ecosystems In Mwea, Kenya Using A Negative Binomial Regression Model With A Non-Homogenous Mean, Benjamin G. Jacob, Daniel Griffith, Ephantus Muturi, Erick X. Caamano, Josephat Shililu, John I. Githure, Robert J. Novak Jan 2009

Describing Anopheles Arabiensis Aquatic Habitats In Two Riceland Agro-Ecosystems In Mwea, Kenya Using A Negative Binomial Regression Model With A Non-Homogenous Mean, Benjamin G. Jacob, Daniel Griffith, Ephantus Muturi, Erick X. Caamano, Josephat Shililu, John I. Githure, Robert J. Novak

All Peer-Reviewed Publications

This research illustrates a geostatistical approach for modeling the spatial distribution patterns of Anopheles arabiensis Patton (Patton) aquatic habitats in two riceland environments. QuickBird 0.61m data, encompassing the visible bands and the near-infra-red (NIR) band, were selected to synthesize images of An. arabiensis aquatic habitats. These bands and field sampled data were used to determine ecological parameters associated with riceland larval habitat development. SAS® was used to calculate univariate statistics, correlations and Poisson regression models. Global autocorrelation statistics were generated in ArcGIS® from georeferenced Anopheles aquatic habitats in the study sites. The geographic distribution of Anopheles gambiae s.l. aquatic habitats …

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Larvicidal Activity Of Extracts From Three Plumbago Spp Against Anopheles Gambiae, Barasa M. Maniafu, Lwande Wilber, Isaiah O. Ndiege, Cornelius C. Wanjala, Teresa Ayuko Akenga Jan 2009

Larvicidal Activity Of Extracts From Three Plumbago Spp Against Anopheles Gambiae, Barasa M. Maniafu, Lwande Wilber, Isaiah O. Ndiege, Cornelius C. Wanjala, Teresa Ayuko Akenga

All Peer-Reviewed Publications

Three Plumbago spp have been tested for mosquito larvicidal activity. The crude extracts exhibiting the highest larvicidal activity against Anopheles gambiae were hexane (LC50 = 6.4 μg/mL) and chloroform (LC50 = 6.7 μg/mL) extracts from Plumbago zeylanica Linn, chloroform (LC50 = 6.7 ug/mL) extract from Plumbago stenophylla Bull and ethyl acetate (LC50 = 4.1 μg/mL) extract from Plumbago dawei Rolfe. These LC50 values were within 95% confidence limits. 5-hydroxy-2-methyl-1,4-naphthoquinone (plumbagin) 1 (LC50 = 1.9 μg/mL) and β-sitosterol 2 were characterised from ethyl acetate extract of root bark of P. dawei, a native medicinal plant growing in Kenya, based on spectral …

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Categorization And Indentification Of Mechanisms Of Sugarcane Resistance To The Sugarcane Aphid (Hemiptera: Aphididae), Waseem Akbar Jan 2009

Categorization And Indentification Of Mechanisms Of Sugarcane Resistance To The Sugarcane Aphid (Hemiptera: Aphididae), Waseem Akbar

LSU Doctoral Dissertations

Sugarcane in Louisiana is colonized and sometimes heavily infested by two aphid species, the sugarcane aphid, Melanaphis sacchari (Zehntner), and the yellow sugarcane aphid,Sipha flava(Forbes). Melanaphis sacchari, the main vector of sugarcane yellow leaf virus, is distributed throughout Louisiana’s sugarcane-growing regions. Five cultivars representing 90% of the commercial acreage in Louisiana (LCP 85-384, HoCP 91-555, Ho 95-988, HoCP 96-540,L 97-128) were evaluated for resistance to aphids in the greenhouse. Antibiosis was the primary category of resistance to both aphid species. Based on the intrinsic rate of natural increase, L 97-128 and HoCP 91-555 were comparatively susceptible and resistant cultivars, respectively. …

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Experimental And Natural Variation In Hovering Flight Capacity In Bees, Hymenoptera: Apidae, Jason Thomas Vance Jan 2009

Experimental And Natural Variation In Hovering Flight Capacity In Bees, Hymenoptera: Apidae, Jason Thomas Vance

UNLV Theses, Dissertations, Professional Papers, and Capstones

In honey bees, the capacity for flight underlies many behaviors which impact fitness and longevity, such as the ability to forage or evade predators. However, flight capacity is not fixed across bees' lifespan, which is punctuated by a suite of physiological changes that accompany age and the transition from in-hive to foraging behaviors; thus, flight capacity may vary during periods of development, senescence, or in response to morphological damage such as wing wear. This dissertation describes the biomechanics and aerodynamics which contribute to the scope of honey bee flight performance, and investigates how age, behavioral development, and wing-wear affects flight …

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Effects Of Acephate On The Distribution Of Tarnished Plant Bugs Within The Cotton Plant Profile, Kyle Andrew Fontenot Jan 2009

Effects Of Acephate On The Distribution Of Tarnished Plant Bugs Within The Cotton Plant Profile, Kyle Andrew Fontenot

LSU Master's Theses

The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is a primary pest of cotton in the mid-southern United States. Chemical control strategies are the primary integrated pest management tool used to manage this pest in cotton. A better understanding of tarnished plant bug behavior and distribution on cotton plants is needed to improve the scouting and monitoring protocols used to estimate population and crop injury levels needed to initiate treatments. This pest frequently re-infests fields after insecticide treatments. Sampling protocols should consider the sub-lethal effects of insecticides on migrating populations or on survivors that remain on insecticide-treated plants. Studies …

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