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.
Results
Showing 1 to 20 of 140 for “"aphid"”.
-
Aphid movement and aphid-borne virus spread in mixed cropping systems of legumes and cereals
… practice that has been observed to suppress aphid-borne virus epidemics in indigenous farming systems. This study was aimed at unraveling the physical and biological relationships that affect aphid dispersal and the consequent spread of aphid-borne legume viruses in mixtures of snapbean and …
-
Understanding molecular events during barley aphid interactions
Aphids are phloem-feeding insects that cause severe yield losses on crops, including cereals such as barley. While most aphid species are limited to one or few host species, some are able to reproduce on many plants belonging to different families. Interestingly, aphid probing-behaviour can be …
-
Genetic variation in the aphid Pemphigus spyrothecae
… inbreeding and social behaviour in the aphid $\textit{Pemphigus spyrothecac}$. $\textit{$\textit{P. spyrothecae}$}$ is cyclically parthenogenetic, reproducing sexually on the bark of its primary host, $\textit{Populus nigra}$, and asexually within galls on the leaf petioles. Within the …
-
Characterisation of two aphid picorna-like viruses
A new aphid virus, aphid lethal paralysis virus (ALPV), was isolated from laboratory-propagated Rhopalosiphum padi aphids co-infected with R. padi virus (RhPV). ALPV and RhPV were separated and ALPV was characterised in detail. Virions are isometric with a diameter of 26 nm, a sedimentation …
-
QTL discovery for Japanese beetle resistance in aphid-resistant germplasm, stacking aphid-resistant genes, and metabolite profiling studies in soybean
… and seed companies incorporate soybean aphid (<Aphis glycines> Matsumura) resistance genes into soybean [<Glycine max >(L.) Merr.] cultivars, it is important to retain resistance to insect defoliators. In order to improve MSU aphid-resistant germplasm for resistance to Japanese beetle …
-
Evaluation and Identification of Soybean Aphid Resistance Sources and Mapping of Soybean Aphid Resistance Loci in Early Maturing Soybean Germplasm Accessions
<p>Soybean aphid (Aphis glycines Matsumura) has been a major pest of soybean [Glycine max (L.) Merr.] in North America particularly in the northern United States and three Canadian provinces. At least four biotypes of soybean aphid have been confirmed in the United States. Identification of soybean …
-
Laccase-1 in the pea aphid, Acyrthosiphon pisum (Harris)
… phenoloxidase has been identified in the pea aphid, Acyrthosiphon pisum (Harris) using a combination of substrates that react with laccase. Within the pea aphid, laccase-1 transcript was found to be localized within the gut and the salivary glands. Finally, the specific regions where laccase-1 …
-
Dynamics of the sweetpotato potyvirus aphid pathosystem in Louisiana
… in a non-persistent manner by various aphid species and cause up to 15% yield loss. Sweetpotato is vegetatively propagated, and in the USA growers are supplied with virus tested propagation material to minimize impact of viruses. However the rapid re-infection of these materials with …
-
The Dynamics of Natural Enemy Resistance in Aphid Populations
Many aphids harbour facultative bacterial endosymbionts that can influence aphid fitness. In Acyrthosiphon pisum (the pea aphid), the endosymbiont <i>Hamiltonella defensa</i> confers resistance to parasitism by parasitoid wasps due to the presence of the APSE bacteriophage in the …
-
The effect of spirea aphid (Homoptera: aphididae) feeding and nitrogen fertilization on the growth of young apple trees, with comparisons to apple aphid
… research was to determine the effects of spirea aphid, Aphis spiraecola Patch, feeding and nitrogen fertilization on net photosynthesis (Pn), leaf chlorophyll content and greenneess, growth, dry matter accumulation, and carbohydrate concentrations of young apple trees, with comparisons to apple …
-
The dynamics of molecular components that regulate aphid-plant interactions
Aphids are economically important insect pests, which feed on phloem sap using stylets. Aphids cause significant losses of crop yield, through draining plant resources and vectoring over 275 plant viruses. In plant-pathogen interactions, basal plant defense involving pathogen associated molecular …
-
Dissecting the role of plant immunity in plant-aphid interactions
Aphids are economically important phloem-feeding insects that cause loss in plant productivity worldwide. This occurs through the removal of photoassimilates and the vectoring of hundreds of plant viruses. Plants possess a complex immune system in order to defend themselves from a range of …
-
The Bionomics of The Corn Leaf Aphid, Rhopalosiphum Maidis (Fitch)
Made available in DSpace on 2014-12-09T20:27:30Z (GMT). No. of bitstreams: 1 7021046.pdf: 5364287 bytes, checksum: b51478d3f07f02f7a8b398df9c02ff63 (MD5) Previous issue date: 1970
-
Virus-induced effects on aphid-host interactions in Solanaceous plants
… changes that may influence virus transmission by aphids. In Arabidopsis thaliana ecotype Col-0 and cucurbits, CMV diminishes host suitability for aphids, inhibiting prolonged feeding and encouraging migration of viruliferous aphids from infected plants to healthy plants. In tomato (Solanum …
-
Electron microscopy of aphid-transmissible and nonaphid-transmissible variants of pea enation mosaic virus in pea aphid, Acyrthosiphon pisum (Harris), and garden pea, Pisum sativum L
Thesis (Ph. D.)--Michigan State University. Dept. of Entomology, 1974
-
The effect of lacewing larvae on aphid populations on greenhouse snapdragons
Digitized by Kansas Correctional Industries
-
The effect of lacewing larvae on aphid populations on greenhouse snapdragons
Digitized by Kansas Correctional Industries
-
Understanding the impact of Russian wheat aphid-associated microbes on plants
… of plant defense responses, yet the role of aphid-associated bacteria in modulating host susceptibility remains largely unexplored. This dissertation investigates the influence of bacterial communities associated with the Russian wheat aphid (RWA, Diuraphis noxia) on plant responses, focusing …
-
Predator-prey interactions involving the soybean aphid (Hemiptera: Aphididae) in Missouri
The recently introduced soybean aphid, Aphis glycines Matsumura, is found in all soybean growing areas within Missouri. Despite soybean aphid's widespread distribution, it has reached economic threshold in few soybean fields in Missouri. We hypothesized that a predator complex suppresses soybean …
Page 1 of 7