Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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    Interactions between the invasive brown marmorated stink bug, Halyomorpha halys (Hemiptera: Pentatomidae), and entomopathogenic fungi
    (2014) Pike, Thomas John; Shrewsbury, Paula M; Entomology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Brown marmorated stink bug, Halyomorpha halys, is an invasive stink bug native to Asia. It is a highly destructive pest in both agricultural and ornamental systems. In an effort to identify a novel biological control, several strains of entomopathogenic fungi were tested against brown marmorated stink bug nymphs and adults. Wild-type fungi were found to cause very low mortality in bioassays, as well as resulting in little fungal growth or sporulation. The addition of diatomaceous earth and/or horticultural oil did not increase mortality, nor did the use of transgenic fungi. To test the proposed mechanism of brown marmorated stink bug's defense against fungal infection, trans-2-octenal and trans-2-decenal were bioassayed against several strains of entomopathogenic fungi. These compounds were found to inhibit fungal growth and prevent spore germination at low concentrations. Results of an experiment to determine if brown marmorated stink bug responded to fungal exposure were inconclusive.
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    An assessment of host preference, reproductive suitability and feeding injury of the brown marmorated stink bug, Halyomorpha halys, on selected vegetables
    (2014) Zobel, Emily S.; Hooks, Cerruti R.R.; Entomology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The brown marmorated stink bug, Halyomorpha halys (Heteroptera), is an invasive insect from Asia that has become a major agricultural pest of field and vegetable crops in the Mid-Atlantic States. A field study was conducted to asses the seasonal abundance, host plant preference, reproductive suitability, and injury potential of H. haly on green bean, sweet corn, eggplant, okra and bell pepper. H. halys abundance, life stage phenology, and resulting feeding injury were monitored biweekly throughout the growing season. Overall seasonal abundance consisted of both overwintered adults and their F1 progeny. Sweet corn, okra and bell pepper had significantly higher abundances of H. halys compared to green bean, eggplant, and tomato. Eggplant, okra and bell pepper were the most suitable host plants for H. halys reproduction and development. Sweet corn, okra, bell pepper and tomato were very susceptible to feeding injury and experienced the highest injury rate per stink bug day. The implications of these findings with respect to sampling and management of H. halys in vegetable production are discussed.