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Featured researches published by Glen R. Obear.


Pest Management Science | 2016

Fungicides affect Japanese beetle Popillia japonica (Coleoptera: Scarabaeidae) egg hatch, larval survival and detoxification enzymes

Glen R. Obear; Adekunle W. Adesanya; P. J. Liesch; R. Chris Williamson; David W. Held

BACKGROUND Larvae of the Japanese beetle, Popillia japonica (Coleoptera: Scarabaeidae), have a patchy distribution in soils, which complicates detection and management of this insect pest. Managed turf systems are frequently under pest pressure from fungal pathogens, necessitating frequent fungicide applications. It is possible that certain turfgrass fungicides may have lethal or sublethal adverse effects on eggs and larvae of P. japonica that inhabit managed turf systems. In this study, eggs and first-, second- and third-instar larvae were treated with the fungicides chlorothalonil and propiconazole, and survival was compared with that of untreated controls as well as positive controls treated with the insecticide trichlorfon. RESULTS Chlorothalonil reduced survival of first-instar larvae treated directly and hatched from treated eggs. Propiconazole delayed egg hatch, reduced the proportion of eggs that successfully hatched and reduced survival of first-instar larvae treated directly and hatched from treated eggs. Sublethal doses of the fungicides lowered the activities of certain detoxification enzymes in third-instar grubs. CONCLUSIONS Fungicide applications to turfgrass that coincide with oviposition and egg hatch of white grubs may have sublethal effects. This work is applicable both to high-maintenance turfgrass such as golf courses, where applications of pesticides are more frequent, and to home lawn services, where mixtures of multiple pesticides are commonly used.


Journal of Economic Entomology | 2015

Suitability of Creeping Bentgrass and Bermudagrass Cultivars for Black Cutworms and Fall Armyworms (Lepidoptera: Noctuidae).

Seung Cheon Hong; Glen R. Obear; P. J. Liesch; David W. Held; R. Chris Williamson

ABSTRACT The black cutworm, Agrotis ipsilon Hufnagel, and fall armyworm, Spodoptera frugiperda Smith (Lepidoptera: Noctuidae), are common turfgrass pests of golf courses in the southeastern United States. Heat-tolerant bentgrass (Agrostis stolonifera L.) cultivars are expanding the range of bentgrass further south, but these cultivars have not been studied for their potential host plant resistance to black cutworm or fall armyworm. The goals of the study were to investigate feeding response of black cutworm and fall armyworm to these newer heat-tolerant creeping bentgrass cultivars, as well as commonly used cultivars of bermudagrass [Cynodon dactylon (Loppers.)]. Choice and no-choice feeding assays and fecundity tests were conducted in the laboratory and greenhouse to evaluate performance and preference of the two insects. When given a choice, neither black cutworm nor fall armyworm showed a preference for the majority of new cultivars tested. There were no differences in leaf area consumption or insect development for either pest in no-choice feeding assays. Black cutworm females preferred laying eggs in bentgrass compared with bermudagrass, but will oviposit onto bermudagrass, suggesting that both turf species are suitable hosts of this pest. The broad host ranges of generalist caterpillar pests of turfgrass hinder the application of host plant resistance in integrated pest management on golf courses.


Geoderma | 2014

Soils with iron-cemented layers on golf courses in the USA.

Glen R. Obear; Alfred E. Hartemink; Douglas J. Soldat


Crop Science | 2016

Soil Inorganic Carbon Accumulation in Sand Putting Green Soils: I. Field Relationships among Climate, Irrigation Water Quality, and Soil Properties

Glen R. Obear; Douglas J. Soldat


Crop Science | 2016

Soil Inorganic Carbon Accumulation in Sand Putting Green Soils II: Acid–Base Relationships as affected by Water Chemistry and Nitrogen Source

Glen R. Obear; Phillip Barak; Douglas J. Soldat


asian test symposium | 2014

Oviposition Preference of the Japanese Beetle (Coleoptera: Scarabaeidae) in Golf Putting Greens under Different Soil Moisture and Fungicide Regimes

Glen R. Obear; R. Chris Williamson; P. J. Liesch


Crop Science | 2018

Growing Degree-Day Models Predict the Performance of Paclobutrazol on Bentgrass Golf Putting Greens

William C. Kreuser; Glen R. Obear; Darrell J. Michael; Douglas J. Soldat


itsrj | 2017

Organic Fertilizer Deters Vertebrate Pests from White Grub-Infested Turf

R. Chris Williamson; Glen R. Obear


Crop Science | 2017

Biosolids as an Alternative Fertilizer for Kentucky Bluegrass Sod Production in Wisconsin

Shane Griffith; Nicholas J. Bero; John Stier; Glen R. Obear; Sabrina J. Ruis; Douglas J. Soldat


Crop Science | 2017

Plant Colorants Interfere with Reflectance-Based Vegetation Indices

Glen R. Obear; William C. Kreuser; Ken Hubbard; Brad T. DeBels; Douglas J. Soldat

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Douglas J. Soldat

University of Wisconsin-Madison

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R. Chris Williamson

University of Wisconsin-Madison

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P. J. Liesch

University of Wisconsin-Madison

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William C. Kreuser

University of Nebraska–Lincoln

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Alfred E. Hartemink

University of Wisconsin-Madison

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Brad T. DeBels

University of Wisconsin-Madison

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Darrell J. Michael

University of Nebraska–Lincoln

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John Stier

University of Tennessee

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