Pest management of soybean aphid and soybean cyst nematode: Host-plant resistance, entomopathogens, and seed-applied pesticides

dc.contributor.advisor Erin W. Hodgson
dc.contributor.advisor Aaron J. Gassmann
dc.contributor.author Clifton, Eric
dc.contributor.department Entomology
dc.date 2018-08-11T13:43:11.000
dc.date.accessioned 2020-06-30T03:04:24Z
dc.date.available 2020-06-30T03:04:24Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2017
dc.date.embargo 2001-01-01
dc.date.issued 2017-01-01
dc.description.abstract <p>Farmers can benefit from tools that are applied at planting and can still manage pest populations throughout the growing season. To meet these demands, some of the tools include host-plant resistance and seed-applied pesticides. However, prophylactic applications of pesticides in a seed treatment may not always be needed to preserve yield. The complex biology of induced plant defenses could also be exploited to make crops more tolerant to pest injury. Here we focus on two major soybean pests: soybean aphid, Aphis glycines Matsumura, and soybean cyst nematode, Heterodera glycines Ichinohe.</p> <p>One field study was conducted in multiple years and locations with experimental plots to compare the effects of host-plant resistant cultivars and pesticidal seed treatments on soybean aphid, soybean cyst nematode, and soybean yield. Complementary studies were performed in the greenhouse with the same treatments. Host-plant resistance effectively suppressed both soybean pests; however, pesticidal seed treatments were inconsistent.</p> <p>A laboratory study was performed to explore inducible host plant defenses and its potential impacts on soybean aphid. Fungal entomopathogens were used as plant inoculum and molecular tools to identify isolates of these fungi that naturally occur in agricultural fields. Fungal entomopathogens could establish as endophytes in soybean, but the fungus Metarhizium brunneum actually increased populations of soybean aphid on inoculated plants. All of the fungal isolates were Metarhizium robertsii, which confirms its prevalence throughout North American soils.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/15501/
dc.identifier.articleid 6508
dc.identifier.contextkey 11055382
dc.identifier.doi https://doi.org/10.31274/etd-180810-5118
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/15501
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/29684
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/15501/Clifton_iastate_0097E_16294.pdf|||Fri Jan 14 20:42:08 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Entomology
dc.subject.disciplines Plant Pathology
dc.subject.keywords Aphid
dc.subject.keywords Fungi
dc.subject.keywords Host plant resistance
dc.subject.keywords Integrated Pest Management
dc.subject.keywords Nematode
dc.subject.keywords Pesticide
dc.title Pest management of soybean aphid and soybean cyst nematode: Host-plant resistance, entomopathogens, and seed-applied pesticides
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication f47c8cad-50be-4fb0-8870-902ff536748c
thesis.degree.discipline Entomology
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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