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 20 of 21 for “"insect damage"”.
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Effects of Grower Management Practices and Field Characteristics on Insect Damage to Sweetpotato (Ipomoea batatas (L. Lam.) Roots.
… practices and field characteristics with insect damage to sweetpotato roots. Injury by wireworm, Diabrotica spp., and Systena spp. (WDS) complex, sweetpotato flea beetle, white grubs, and whitefringed beetle was categorized by the incidence of roots injured by those species and the …
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Transgenerational Plasticity is Sex-dependent and Persistent in Yellow Moneyflower (Mimulus guttatus)
… trichome production in response to simulated insect damage. Here we test for differences between maternal and paternal transmission of this response and examine its persistence over five generations following damage. Maternal and paternal damage resulted in similar and apparently additive …
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The role of insect leaf herbivory on the mangroves Avicennia marina and Rhizophora stylosa
This thesis examines insect leaf herbivory and the insect herbivore community on two common mangrove species – Avicennia marina and Rhizophora stylosa, at two sites near Townsville, northern Queensland. Despite its widely recognised importance in other forested ecosystems, the role of insect …
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Arthropod damage in corn across site-specific management zones and differing water and nitrogen levels
Site-specific insect management has the potential to make pest management more efficient, but has yet to be implemented. One method of implementing site-specific management would be to make decisions at the management zone level. Management zones are homogenous subregions within a field that can be …
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Design and Development of a Low-cost Acoustic Device to Detect Pest Infestation in Stored Maize
Insect damage in stored maize is one of the major post-harvest losses occurring in developing countries, especially in sub-Saharan Africa. To reduce economic losses, separation of infested grains from clean ones is critical and requires detection of infestation in stored grains. This study aimed at …
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AVIAN FORAGING RESPONSE TO JACK PINE (PINUS BANKSIANA) VOLATILE CHEMICALS
… and other plants by removing herbivores that damage the plant and impede its growth. They can significantly increase the growth and biomass of the trees by foraging on the herbivores that harm plants, and the prey items eaten in turn benefits foraging birds by providing sustenance. This …
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Smallholder food security in sub-Saharan Africa: the case for diatomaceous earth grain protectants
… dusts are non-toxic to mammals but deadly to insects absorbing the wax from the insect’s cuticle which leads to water loss and death. Following laboratory studies, promising commercial DEs were trialled collaboratively by researchers and farmers as grain protectants in Zimbabwe. Protect-lt and …
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Impact of carbofuran on spring-seeded alfalfa and associated insect pests
… Soi 1 samples were screened for soil-dwelling insects. Potato leafhopper populations were monitored by sweep net sampling. Severe seedcorn maggot damage and high larval populations were associated with conventionally planted fields prepared by disking a small grain cover crop, and were …
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Impacts of climate change on herbivore induced plant signaling and defenses
… influences the interactions between plants and insects. To examine the effect of elevated atmospheric CO2 and O3 concentrations on plant-insect interaction, I measured changes in transcription using microarray analysis of field-grown soybean (Glycine max). I found that the number of transcripts …
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The role of red-backed salamanders in ecosystems
… nitrogen cycling, acorn germination, or foliar insect damage. Since the timing of salamander activity could influence their role in ecosystem functions, I also examined the seasonal activity patterns of red-backed salamanders. I found that salamanders were most active in the spring and fall on …
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Compatible components of the integrated pest management of Bathycoelia distincta (Hemiptera: Pentatomidae
… is a major pest of macadamia. It causes damage by directly feeding on macadamia kernel throughout the season and reducing nut quality by inducing nut abscission, premature nut abortion, necrotic lesions, deformed kernels, discoloration, or translucent blemishes on the kernel. Currently, …
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Host plant resistance and epidemiology of Fusarium ear rot in maize.
… Field data were collected on disease incidence, insect and/or bird damage, ear tip infection (silk), rainfall, and temperature. Isolations were made in the laboratory from samples showing evidence of infection, and the five prevalent Fusarium species (F. graminearum, F. moniliforme, F. …
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The Role of Blackberry Grades and Fermentation Methods on Blackberry Kombucha Quality and Aroma Characteristics from Small-Scale Fermentation
… in physical characteristics like size, color, or insect damage but both are still safe to consume. Utilization of the quality-compromised U.S. No.2 blackberries in innovative ways, like in a kombucha product, could help these growers reduce produce waste as well as increase their revenue. However, …
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Information on emergent insect associated tree diseases including epidemiological studies of drippy blight disease of oak and thousand cankers disease of walnut
… Finally, it was noted that a kermes scale insect was abundant on all diseased oaks, but its role as a vector is unknown. Overall, this research documents the microbe and insect causal agents in this disease complex. These findings are biologically significant as the isolated bacterium was …
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Canopy dieback and decline in pink gums, Eucalyptus fasciculosa, F.Muell in the Mt Lofty Ranges and adjoining plains
… Dieback was most likely to be associated with insect attack. Within the study region, pink gums occupy a wide gradient of rainfall, soil type and topography. A regional survey between 2009 and 2012 recorded that the mean canopy intactness for 2814 pink gums was 70%, but canopy condition varied …
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Insights into the seasonal ecology and thermal biology of the lesser grain borer, Rhyzopertha dominica (Coleoptera: Bostrichidae)
… roughly 10 percent of global grain is lost to insect damage, costing the U.S. alone over 2.5 billion dollars annually. Among the estimated 1,500 insect species that can infest stored grain, the lesser grain borer, Rhyzopertha dominica, is a major pest capable of infesting intact kernels and …
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Improving the health benefits of broccoli through myrosinase maintenance
… plant cell. When tissue is crushed, such as in insect damage, glucoraphanin and myrosinase come in contact and form an intermediate that breaks down to form the isothiocyanate SF. Importantly, when broccoli is crushed/chewed before swallowing by the consumer, the same process takes place as long …
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Toxicity of mycotoxins to insects and underlying molecular and biochemical mechanisms
… of dollars annually in the United States alone Insects inevitably encounter mycotoxins in nature when they feed on unharvested (mummy) fruits in orchard situations. Insects can be vectors of fungal spores and also facilitate fungal access to their host plants. Insects in turn may take advantage …
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Fruit bat diet, foraging ecology and seed dispersal in the Vhembe Biosphere Reserve.
… farmers often stems from perceived or actual damage to their crops, especially during the harvest season. Such conflict often leads to the persecution of fruit bats, either legally or illegally. Therefore, a proactive assessment of bats diet in agroecosystems is important. South Africa is one …
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Dichlorodiphenyltricholorethane (DDT) resistance mechanisms in Drosophila melanogaster and applications for the cowpea pest Clavigralla tomentosicollis
Control of insects by insecticides has led to resistance in both medical and agricultural pests as well as health and environmental concerns, and improved insect pest management (IPM) programs are necessary. The arrival of next-generation sequencing (NGS) and lowered sequencing costs provides the …
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