Glen R. Obear
University of Nebraska–Lincoln
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Featured researches published by Glen R. Obear.
Pest Management Science | 2016
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
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
Glen R. Obear; Alfred E. Hartemink; Douglas J. Soldat
Crop Science | 2016
Glen R. Obear; Douglas J. Soldat
Crop Science | 2016
Glen R. Obear; Phillip Barak; Douglas J. Soldat
asian test symposium | 2014
Glen R. Obear; R. Chris Williamson; P. J. Liesch
Crop Science | 2018
William C. Kreuser; Glen R. Obear; Darrell J. Michael; Douglas J. Soldat
itsrj | 2017
R. Chris Williamson; Glen R. Obear
Crop Science | 2017
Shane Griffith; Nicholas J. Bero; John Stier; Glen R. Obear; Sabrina J. Ruis; Douglas J. Soldat
Crop Science | 2017
Glen R. Obear; William C. Kreuser; Ken Hubbard; Brad T. DeBels; Douglas J. Soldat