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2017

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Articles 121 - 150 of 1256

Full-Text Articles in Entomology

Drosophilidae (Diptera) Collected In Spring In Michigan, Henretta Trent Band Dec 2017

Drosophilidae (Diptera) Collected In Spring In Michigan, Henretta Trent Band

The Great Lakes Entomologist

Drosophilids in mid-Michigan overwinter in a preadult stage. One hun- dred twenty-two individuals (84 f, 38 m) representing 14 species were collected over bait in April and May 1992. All appeared recently emerged and had entire wings. This agrees with earlier reports in Michigan and Massachusetts that Drosophila affinis group species overwinter as preadults. Among the species overwintering as preadults in Michigan, Drosophila affinis, D. algonquin, D. athabasca, D. robusta, D. falleni and D. recens have been found to overwinter as adults in New York Latitude and climate may play a role in drosophilid overwintering stage.

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Distinguishing Nymphal Instars Of Mesovelia Mulsanti (Heteroptera: Mesoveliidae), J. E. Mcpherson, Steven J. Taylor Dec 2017

Distinguishing Nymphal Instars Of Mesovelia Mulsanti (Heteroptera: Mesoveliidae), J. E. Mcpherson, Steven J. Taylor

The Great Lakes Entomologist

The five nymphal instars of Mesouelia mulsanti can be separated by the number of rows of setae on the second abdominal tergum. Fifth instars can be separated from younger instars and from each other by the degree of development of the external genitalia.

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Movement Of Adult Colorado Potato Beetles, Leptinotarsa Decemlineata (Coleoptera: Chrysomelidae), In Response To Isolated Potato Plots, Michael A. Caprio, Edward J. Grafius Dec 2017

Movement Of Adult Colorado Potato Beetles, Leptinotarsa Decemlineata (Coleoptera: Chrysomelidae), In Response To Isolated Potato Plots, Michael A. Caprio, Edward J. Grafius

The Great Lakes Entomologist

Mark recapture techniques were used to determine Colorado potato beetle movement in circular arenas with isolated plots of potatoes at each ordinal direction. Post-diapause beetles aggregated on one or a few of the plants in one of the plots for each release, but not on the same plants in different releases. Differences in plant attractiveness were therefore not likely responsible for the aggregatory behavior. Aggregations were probably a result of either coordinated movement from the release site to the plants or an aggregatory signal with a range of at least 15 m. Summer adults did not aggregate on plants. Correlations …

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Interaction Between Visual And Phonotactic Orientation During Flight In Magicicada Cassini (Homoptera: Cicadidae), Thomas E. Moore, Franz Huber, Theo Weber, Ulla Klein, Cornelia Back Dec 2017

Interaction Between Visual And Phonotactic Orientation During Flight In Magicicada Cassini (Homoptera: Cicadidae), Thomas E. Moore, Franz Huber, Theo Weber, Ulla Klein, Cornelia Back

The Great Lakes Entomologist

Visual and phonotactic orientation often occur simultaneously in diurnal cicadas. and these animals generally have their largest sensory elaboration in eyes and hearing organs. Phonotactic orientation occurs principally during flight. Males and females of Magicicada cassini commonly perform low- altitude « 5 m) and short-distance « 15 m) flights in their natural habitat at flight speeds of 3 to 6 m/s. During flight, the long body axis is tilted 10° to Q , head upward. Wing beat frequencies of tethered animals at 24° to 26°C averaged 28.8 Hz. Body temperature in the field for flying individuals aver- aged 4.6°C above …

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Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Iv. Distribution, Habitat, Life Cycle, And Identification Of Species Of Agabini (Colymbetinae), William L. Hilsenhoff Dec 2017

Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Iv. Distribution, Habitat, Life Cycle, And Identification Of Species Of Agabini (Colymbetinae), William L. Hilsenhoff

The Great Lakes Entomologist

Adults of 24 species of Agabus and 10 species of Ilybius were collected in Wisconsin over the last 32 years. Keys and notes on identification are pro­vided to facilitate identification of adults of these species and six others that may occur in Wisconsin. Agabus larvae were separated from those ofIlybius by the more posterior position of the dorsal seta of the basal setal whorl on the urogomphus, the number and location of srines on the metatarsi, and the presence of long setae on the last abdomina segment of most species. Information on distribution and abundance in Wisconsin, habitat. and …

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The Distribution Of Three Broadly Sympatric Species Of Symmerista Moths (Lepidoptera: Notodontidae) In The Great Lakes And Midwest Regions Of The United States., Julian P. Donahue Dec 2017

The Distribution Of Three Broadly Sympatric Species Of Symmerista Moths (Lepidoptera: Notodontidae) In The Great Lakes And Midwest Regions Of The United States., Julian P. Donahue

The Great Lakes Entomologist

All three superficially inseparable species of Symmerista known to occur in eastern North America are sympatric in, and reach their western limit of distribution in, the southern Great Lakes and Midwest Regions of the United States. In this region two of the species also reach their southern limit of distribution (S. canicosta reaches its southwestern limit in North Dakota, South Dakota, Missouri, Kentucky, and North Carolina; S. leucitys reaches its southwestern limit in North Dakota, Missouri and Kentucky). The third species (S. albifrons) reaches its northwestern limit in Michigan and Wisconsin. All three species are here documented …

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Use Of Ethanol-And-Turpentine-Baited Flight Traps To Monitor Pissodes Weevils (Coleoptera: Curculionidae) In Christmas Tree Plantations, L. K. Rieske, K. F. Raffa Dec 2017

Use Of Ethanol-And-Turpentine-Baited Flight Traps To Monitor Pissodes Weevils (Coleoptera: Curculionidae) In Christmas Tree Plantations, L. K. Rieske, K. F. Raffa

The Great Lakes Entomologist

Pissodes nemorensis and Pissodes strobi are major pests of pine production in eastern North America. Ethanol-and-turpentine baited traps were used here to monitor weevil populations in a Scotch pine Christmas tree plantation in Wisconsin. Baited pitfall traps were ineffective in trapping either weevil species. However, baited flight traps at 0.8 and 1.6 m above ground effectively captured flying weevils of both species, 70% of which were P. nemoren­sis. Females of both species were more attracted than males to the ethanoll turpentine baits. Significantly more female P. nemorensis and total P. nemorensis were trapped at a height of 0.8 m …

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A New Microsporidium In Alfalfa Weevil Populations: Distribution And Characterization, Leellen F. Solter, Stephen J. Roberts, Joseph V. Maddox, Edward J. Armbrust Dec 2017

A New Microsporidium In Alfalfa Weevil Populations: Distribution And Characterization, Leellen F. Solter, Stephen J. Roberts, Joseph V. Maddox, Edward J. Armbrust

The Great Lakes Entomologist

A microsporidium species, not previously reported, was found infecting field populations of the alfalfa weevil, Hypera postica, in Illinois. The pathogen is widely distributed thoughout the state. Percent infection ranged from 1 % to 50% at different collection locations. Characteristics of the microsporidium and possible modes of transmission are presented.

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Effects Of Nitrogen Fertilization On Monoterpenes Of Jack Pine Seedlings And Weight Gain Of Jack Pine Budworm (Lepidoptera: Tortricidae), Deborah G. Mccullough, Paul D. Swedenborg, Herbert M. Kulman Dec 2017

Effects Of Nitrogen Fertilization On Monoterpenes Of Jack Pine Seedlings And Weight Gain Of Jack Pine Budworm (Lepidoptera: Tortricidae), Deborah G. Mccullough, Paul D. Swedenborg, Herbert M. Kulman

The Great Lakes Entomologist

Nine-month old jack pine (Pinus banksiana) seedlings were grown in a greenhouse under four nitrogen fertilization regimes. Levels of total nitrogen and five monoterpenes in new foliage were measured. Fertilization resulted in four significantly different levels of foliar nitrogen; means ranged from 1.8-4.5 percent dry weight. Contrary to predictions of resource availability theory, seedlings grown under the highest fertilization regime had higher foliar monoterpene levels than seedlings in the other treatments. Newly molted, sixth-instar female jack pine budworm (Choristoneura pinus pinus [Lepidoptera: Tortricidae]) larvae were allowed to feed for four days on new foliage of the seedlings. …

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Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Iii. Distribution, Habitat, Life Cycle, And Identification Of Species Of Colymbetinae, Except Agabini, William L. Hilsenhoff Dec 2017

Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Iii. Distribution, Habitat, Life Cycle, And Identification Of Species Of Colymbetinae, Except Agabini, William L. Hilsenhoff

The Great Lakes Entomologist

Nineteen species of Colymbetinae, excluding Agabini, were collected in Wisconsin over the past 30 years. Included are three species of Colymbetes, two species of Copelatus, three species of Coptotomus, two species of Matus, two species of Neoscutopterus, and seven species of Rhantus. Species keys are provided for adults, but larvae are poorly known and species keys are provided only for larvae of Matus and Neoscutopterus. Information on distribution and abundance in Wisconsin, habitat, life cycle, and identification is provided for each species based on a study of 9,857 adults and 834 larvae. Most …

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Solvent Deactivation Of Mimosa Webworm Larval Webbing (Lepidoptera: Plutellidae), Robert C. North, Elwood R. Hart, Lu Mingxian Dec 2017

Solvent Deactivation Of Mimosa Webworm Larval Webbing (Lepidoptera: Plutellidae), Robert C. North, Elwood R. Hart, Lu Mingxian

The Great Lakes Entomologist

Untreated larval webbing of the mimosa webworm, Homadaula anisocentra stimulated oviposition. Six-week-old webbing was as active as two-day-old webbing. Stimulatory activity of webbing was lost after rinsing with highly polar solvents, but not after rinsing with nonpolar solvents. Addition of the polar solvent rinses did not induce activity in other substrates nor restore activity to rinsed webbing. No differences in structure were found in a scanning electron microscope examination of unrinsed webbing and webbing rinsed with solvents of varying polarity.

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Seasonal Abundance And Species Diversity Of Adult Tabanidae (Diptera) At Lake Lansing Park-North, Michigan, Jeffrey D. Strickler, Edward D. Walker Dec 2017

Seasonal Abundance And Species Diversity Of Adult Tabanidae (Diptera) At Lake Lansing Park-North, Michigan, Jeffrey D. Strickler, Edward D. Walker

The Great Lakes Entomologist

A two year study was undertaken to determine the seasonal abundance and diversity of adult deer flies and horse flies, to compare two methods of sampling (Malaise trap and sweep net), and to estimate attack rates by tabanids on people at Lake Lansing Park-North, Ingham County, Michigan, in 1990 and 1991. Tabanids were sampled using dry ice-baited Malaise traps, and by making over- head sweeps with a standard insect net while hiking a trail. Hybomitra spp. (299 individuals of 9 species) peaked in abundance in mid-May to early June in both years. Chrysops spp. (11,675 individuals of 14 species) and …

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Seasonal Flight Patterns Of Miridae (Hemiptera) In A Southern Illinois Black Walnut Plantation, J. E. Mcpherson, B. C. Weber, T. J. Henry Dec 2017

Seasonal Flight Patterns Of Miridae (Hemiptera) In A Southern Illinois Black Walnut Plantation, J. E. Mcpherson, B. C. Weber, T. J. Henry

The Great Lakes Entomologist

The seasonal flight patterns of 92 species of Miridae collected in window traps in a southern Illinois black walnut plantation are compared with similar data from a North Carolina black walnut plantation. Flying height distributions and seasonal flight activities of Amblytylus nasutus, Deraeocoris nebulosus, Leptopterna dolabrata, Lopidea heidemanni, Lygus lineolaris, and Plagiognathus politus are considered in detail. Six species are newly recorded for Illinois.

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Absence Of Behavioral Induction In Oviposition Preference Of Papilio Glaucus (Lepidoptera: Papilionidae), J Mark Scriber Dec 2017

Absence Of Behavioral Induction In Oviposition Preference Of Papilio Glaucus (Lepidoptera: Papilionidae), J Mark Scriber

The Great Lakes Entomologist

This study addressed the possible behaviora induction effects of previous exposure to several specific host plants on subsequent host "preference hierarchy" and "specificity" (i.e .. how far down the ranking order a female will go) the most polyphagous swallowtail butterfly in the world, Papilio glaucus (Papilionidae). Multi-choice preference bioassays using individual females in revolving arenas were used to assess one of the potentially most significant non-genetic sources of variation: learned (or induced) oviposition preferences. Results of the 4-choice studies using tulip tree (Liriodendron tulipifera; Magnoliaceae), black cherry (Prunus serotina; Rosaceae), quaking aspen (Populus tremuloides; …

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Advanced Biotechnology Tools For Invasive Species Management, Invasive Species Advisory Committee Dec 2017

Advanced Biotechnology Tools For Invasive Species Management, Invasive Species Advisory Committee

National Invasive Species Council

Increasingly, genetic tools are being used to detect and solve pressing environmental, social, and health-related challenges. It is clear that investments in technology innovation can be game changing, as advances in biotechnology may provide new methods to protect the nation’s resources from the negative impacts of invasive species. The current toolbox of management options is recognizably insufficient to deal with many of the high-impact species that have been introduced. However, “surrendering” to these species is generally not a viable option from ecological, health, economic, socio-cultural, or political perspectives. Cost-efficient solutions to these “grand invasive species challenges” need to be found. …

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Enhancing Federal-Tribal Coordination Of Invasive Species, Blaine Parker, Chuck Bargeron, Sean Southey, Lori Buchanan, Miles Falck, Chris Fisher, Joe Maroney, Mervin Wright, Gintas Zavadkas Dec 2017

Enhancing Federal-Tribal Coordination Of Invasive Species, Blaine Parker, Chuck Bargeron, Sean Southey, Lori Buchanan, Miles Falck, Chris Fisher, Joe Maroney, Mervin Wright, Gintas Zavadkas

National Invasive Species Council

Invasive species are defined by the United States government to mean “with regard to a particular ecosystem, a non-native organism whose introduction causes or is likely to cause economic or environmental harm, or harm to human, animal, or plant health” (Executive Order [EO] 13751). The ecosystems to which invasive species are introduced or spread are not delimited by jurisdictional boundaries; they intersect with lands managed by federal, tribal, state, territorial, and county governments, as well as properties under private ownership. For this reason, effective coordination and cooperation across jurisdictions is of paramount importance in the prevention, eradication, and control of …

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Comparative Analysis Of Double-Stranded Rna Degradation And Processing In Insects, Indrakant K. Singh, Satnam Singh, Kanakachari Mogilicherla, Jayendra Nath Shukla, Subba R. Palli Dec 2017

Comparative Analysis Of Double-Stranded Rna Degradation And Processing In Insects, Indrakant K. Singh, Satnam Singh, Kanakachari Mogilicherla, Jayendra Nath Shukla, Subba R. Palli

Entomology Faculty Publications

RNA interference (RNAi) based methods are being developed for pest management. A few products for control of coleopteran pests are expected to be commercialized soon. However, variability in RNAi efficiency among insects is preventing the widespread use of this technology. In this study, we conducted research to identify reasons for variability in RNAi efficiency among thirty-seven (37) insects belonging to five orders. Studies on double-stranded RNA (dsRNA) degradation by dsRNases and processing of labeled dsRNA to siRNA showed that both dsRNA degradation and processing are variable among insects belonging to different orders as well as among different insect species within …

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Use Of Communal Nest Entrances By Osmia Simillima (Hymenoptera: Megachilidae), Virginia Scott Dec 2017

Use Of Communal Nest Entrances By Osmia Simillima (Hymenoptera: Megachilidae), Virginia Scott

The Great Lakes Entomologist

Six Osmia simillima females used communal nest entrances to gain access to their nests in a piece of buried wood. Some nest characteristics are described.

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New Prey Families For Crabro Advena (Hymenoptera: Sphecidae), Frank E. Kurczewski Dec 2017

New Prey Families For Crabro Advena (Hymenoptera: Sphecidae), Frank E. Kurczewski

The Great Lakes Entomologist

Three new prey families of adult Diptera are presented for Crabro advena, bringing to 14 the total number of fly families captured by this euryphagous wasp. The variety of prey flies used as provisions by this species is probably related to its varied nesting habitat.

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Resistance Stability Of The Secondary Tiller Of 'Caldwell' Wheat After The Primary Culm Was Infested With Virulent Hessian Fly (Diptera: Cecidomyiidae) Larvae, Stanley G. Wellso, Jaime E. Araya Dec 2017

Resistance Stability Of The Secondary Tiller Of 'Caldwell' Wheat After The Primary Culm Was Infested With Virulent Hessian Fly (Diptera: Cecidomyiidae) Larvae, Stanley G. Wellso, Jaime E. Araya

The Great Lakes Entomologist

Secondary tiller resistance of 'Caldwell' wheat, Triticum aestivum, with the H6 gene for larval resistance to Hessian fly, Mayetiola destructor, was maintained, after the primary culm had been previously infested with virulent larvae. Earlier studies showed that a primary culm infested initially with a virulent larva allowed subsequent normally avirulent larvae to survive on that cultivar; however, in our study the resistance of secondary tillers was mainained even though the primary culm was infested earlier with virulent Hessian fly larvae. This gene stability for resistance is important for optimizing wheat yield of those cultivars that possess genes resistant to …

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Field Investigations On The American Dog Tick, Dermacentor Variabilis, In Northwest Ohio (Acari: Ixodidae), Kelly M. Micher, C. Lee Rockett Dec 2017

Field Investigations On The American Dog Tick, Dermacentor Variabilis, In Northwest Ohio (Acari: Ixodidae), Kelly M. Micher, C. Lee Rockett

The Great Lakes Entomologist

Ecological investigations on the American dog tick, Dermacentor variabilis, were conducted in two metroparks located in Lucas County, Ohio. Adult tick surveys were conducted in 1989 and 1990. For both years, adult tick activity began in late April, and adult ticks were most abundant from early May to mid-June. Observed activity had ceased by early August, producing a unimodal pattern of activity. Sunny days with temperatures between 24 ° and 32°C were most conducive to adult tick activity, and adult ticks were most abundant on grass trails and in meadows. Using nest boxes inhabited by white-footed mice, immature tick …

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Microctonus Pachylobii (Hymenoptera: Braconidae): New Host Record From Hylobius Radicis (Coleoptera: Curculionidae), And Additional Notes On Its Biology, George D. Hoffman, Kenneth F. Raffa Dec 2017

Microctonus Pachylobii (Hymenoptera: Braconidae): New Host Record From Hylobius Radicis (Coleoptera: Curculionidae), And Additional Notes On Its Biology, George D. Hoffman, Kenneth F. Raffa

The Great Lakes Entomologist

The endoparasite Microctonus pachylobii was discovered parasitizing a new weevil host, Hylobius radicis. Thirteen of the 154 H. radicis adults collected were parasitized (8.5%). The median numbers of parasites per weevil were 26 (x =22.5) during the period April through June, and 4 (x =9.4) during August and September. The median male:female sex ratio was 0.91 (x =0.65). Males emerged approximately 1 day earlier than females. Median parasite mortality while in the cocoon was 10.2% per parasitized weevil (x = 11.8%). Microctonus pachylobii was not found parasitizing two previously recorded weevil hosts from field samples, Hylobius rhizophagus and H. …

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Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Ii. Distribution, Habitat, Life Cycle, And Identification Of Species Of Dytiscinae, William L. Hilsenhoff Dec 2017

Dytiscidae And Noteridae Of Wisconsin (Coleoptera). Ii. Distribution, Habitat, Life Cycle, And Identification Of Species Of Dytiscinae, William L. Hilsenhoff

The Great Lakes Entomologist

Twenty-one species of Dytiscinae were collected in Wisconsin over the past 30 years, including three species of Acilius, one species of Cybister, eight species of Dytiscus, five species of Graphoderus, two species of Hydaticus, and two species of Thermonectus. Species keys are provided for adults, and except for Dytiscus and Cybister, keys are also provided for larvae. Based on a study of 13,236 adults and 854 larvae, information on the distribution and abundance of each species in Wisconsin is provided along with notes on their habitat, life cycle, and identification.

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Aphid Prey Of Passaloecus Cuspidatus (Hymenoptera: Sphecidae), John M. Fricke Dec 2017

Aphid Prey Of Passaloecus Cuspidatus (Hymenoptera: Sphecidae), John M. Fricke

The Great Lakes Entomologist

Provisioning activity of Passaloecus cuspidatus extended from 29 May through 6 August 1987. Eighty trap-nests contained 281 provisioned cells containing 9,618 aphids. The average number of aphids per cell was 34.2 and the average number of cells provisioned per day was 0.73. Passaloecus cuspidatus stored the following aphids as provisions: Cinaria sp., Euceraphis sp., Macrosiphum euphorbiae, Myzus sp., Myzus cerasi, Myzus monardae, and Sitobium avenae. The number of aphids provisioned per cell was inversely related to aphid size. The number of aphids provisioned per cell varied signifI­cantly (9-74).

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New Distribution Records Of The Tiger-Moth Genus Phragmatobia In North America (Lepidoptera: Arctiidae: Arctiinae), Julian P. Donahue Dec 2017

New Distribution Records Of The Tiger-Moth Genus Phragmatobia In North America (Lepidoptera: Arctiidae: Arctiinae), Julian P. Donahue

The Great Lakes Entomologist

New distribution records for all three Nearctic species of Phragmatobia include state records (the first records for the states indicated) of P lineata (Maryland, Wisconsin); P fuliginosa rubricosa (Ohio, South Dakota), and P assimilans (Idaho, Montana, Pennsylvania, Wisconsin), all representing southern range extensions at those longitudes except for the Wisconsin records of P lineata, which are northern range extensions. Chelone glabra (Scrophulariaceae) is reported as a larval hostplant of P lineata, and descriptive notes on the larva of this species are included. Midwinter activity of a larva crawling on snow is reported for P fuliginosa rubricosa. The rare …

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Methods For Artificial Rearing Of Solitary Eumenid Wasps (Hymenoptera: Vespidae: Eumeninae), Charles F. Chilcutt, David P. Cowan Dec 2017

Methods For Artificial Rearing Of Solitary Eumenid Wasps (Hymenoptera: Vespidae: Eumeninae), Charles F. Chilcutt, David P. Cowan

The Great Lakes Entomologist

Solitary eumenid wasps of the genera Ancistrocerus and Euodynerus can be reared in small cages. Laboratory-reared larvae of the spruce budworm caterpillars, Choristoneura fumiferana (Lepidoptera: Torlricidae) are suitable prey.

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A New Eutarsopolipus (Acari: Podapolipidae); Parasite Of Harpalus Herbivagus (Coleoptera: Carabidae) From Michigan, Robert W. Husband Dec 2017

A New Eutarsopolipus (Acari: Podapolipidae); Parasite Of Harpalus Herbivagus (Coleoptera: Carabidae) From Michigan, Robert W. Husband

The Great Lakes Entomologist

Eutarsopolipus porteri n. sp. (Acari: Podapolipidae) is described from HarpaIus herbivagus and E. elongatus is reported for the first time in North America from Amara aenea (Coleoptera: Carabidae) from Fort Custer State Recreation Area, Kalamazoo County, Michigan. Of the 7 species of Podapolipidae known from American Carabidae, E. elongatus was introduced with Amara aenea and the others are native species. All are parasites restricted to Carabidae.

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Horticulture For Pollinator Conservation, Carter M. Westerhold Dec 2017

Horticulture For Pollinator Conservation, Carter M. Westerhold

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Pollinators worldwide are declining. Consequently, the agricultural and ecological services these insects provide are in danger of being lost. Land use intensification, via urbanization, has greatly influenced this decline in pollinators. Luckily, through targeted horticultural practices, stable populations of pollinators can be sustained within urban areas. The horticultural practices of planting diverse floral resources and managing pollinator habitat in urban areas can sustain these populations. Two studies were conducted with the intent to identify horticultural knowledge gaps that could be reduced to aid in pollinator conservation efforts. First, a study to compare Nebraska native and non-native ornamental plants was conducted. …

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Seasonality And Management Of Spotted Wing Drosophila On Berry Crops And Wild Hosts In Arkansas, Lizabeth Rubi Herrera Dec 2017

Seasonality And Management Of Spotted Wing Drosophila On Berry Crops And Wild Hosts In Arkansas, Lizabeth Rubi Herrera

Graduate Theses and Dissertations

Spotted wing drosophila (SWD), Drosophila suzukii (Matsumura) is a serious invasive pest of small fruit production in North and South America and Europe since 2008. The primary control method is to apply insecticides every 5-7 days. Therefore, it is necessary to develop control tactics that are less chemical dependent to enhance an integrated approach for SWD management. The objectives of this study were to monitor SWD populations in different crop systems and adjacent landscape habitats; identify wild hosts of SWD; evaluate the effectiveness of insect exclusion netting in tunnels to prevent blackberry and blueberry infestations, and compare effects of netted …

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Spatial Variation In Western Corn Rootworm (Coleoptera: Chrysomelidae) Susceptibility To Bacillus Thuringiensis Corn Events In Nebraska, Jordan D. Reinders Dec 2017

Spatial Variation In Western Corn Rootworm (Coleoptera: Chrysomelidae) Susceptibility To Bacillus Thuringiensis Corn Events In Nebraska, Jordan D. Reinders

Department of Entomology: Dissertations, Theses, and Student Research

The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, is an economically important pest species of field corn (Zea mays L.) in the U.S. Corn Belt. Yield losses and control costs exceed greater than $1 billion annually. Over the past 10+ years, growers have adopted transgenic corn hybrids expressing rootworm-active Bacillus thuringiensis (Bt) proteins as a primary WCR management tactic. Field-evolved resistance to Cry3Bb1 and mCry3A proteins expressed in single-trait Bt hybrids has been confirmed in some areas of Nebraska. Growers have used different tactics as needed to prevent or mitigate resistance, resulting in a mosaic of selection pressure placed …

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