Thomas Kuhar | Virginia Tech (original) (raw)

Papers by Thomas Kuhar

Arthropod Management Tests, 2021

Arthropod Management Tests, 1998

An experiment was conducted at the Virginia Tech Kentland Farm (Hilltop field) in Montgomery Co.,... more An experiment was conducted at the Virginia Tech Kentland Farm (Hilltop field) in Montgomery Co., VA to determine the effectiveness of several granular insecticides, applied in-furrow or T-band at planting, against WCR larvae on ‘ MA9171’ corn. The experiment was conducted near the center of a 10-acre, no-till cornfield with a predominant Unison-Braddock silt loam soil. The field had been in continuous corn production since 1994, and had been treated with granular insecticides at planting every year since 1995. Plots of 40 X 10 ft (four rows wide) were arranged in a RCBD, with all insecticide treatments and an untreated check replicated four times. An Almaco, 2-row Max-Emerge planter was used to plant the plots on 1 May at the rate of 26,100 seeds/acre. Insecticide granules were applied in front of the presswheels either directly in the seed furrow or in a 5-inch wide T-band over the furrow, depending on the treatment. The standard granular insecticide applicator was removed from ea...

Arthropod Management Tests, 1996

Two experiments were conducted in Mont-gomery Co., VA, to determine the effectiveness of several ... more Two experiments were conducted in Mont-gomery Co., VA, to determine the effectiveness of several granular insecticides applied in-furrow or t-band at planting and a liquid formulation applied postemergence against western corn rootworm larvae on ‘Pioneer 3140’ corn. The experiments were conducted in 2 no-till cornfields consisting of a predominant Duffield-Ernest silt loam soil. Experiment I was in a 20-acre field (‘Back’ field) and Experiment II was in an 8-acre field (‘Machine Shed’ field). The fields had been in continuous corn production since 1988 (Back field) and 1985 (Machine Shed field), and had been treated with granular insecticides at planting every year since 1989 (Back field) and 1990 (Machine Shed field). Plots of 40 X 10 ft (i.e., 4 rows wide) were arranged in a RCB design with all insecticide treatments and an untreated check replicated 4 times. An Almaco, 2-row Max-Emerge planter was used to plant the plots on 12 May at a population density of 26,100 seeds/acre. For...

Arthropod Management Tests, 2007

Arthropod Management Tests, 2007

Arthropod Management Tests, 2005

Arthropod Management Tests, 2007

Journal of Entomological Science, Apr 1, 2014

Journal of Economic Entomology, Feb 13, 2019

Agricultural sciences, 2012

Journal of Economic Entomology, Feb 13, 2019

Plant Health Progress, 2007

Journal of Economic Entomology, Oct 1, 2004

Crop Protection, Jun 1, 2006

Journal of Economic Entomology, Aug 1, 2004

We assessed the ability of Trichogramma ostriniae (Peng &... more We assessed the ability of Trichogramma ostriniae (Peng & Chen) to locate and parasitize Ostrinia nubilalis (Hübner) eggs in crops other than corn, and we evaluated the efficacy of inundative releases of the parasitoid in two solanaceous crops, pepper and potato. Despite a greater plant surface area to search, parasitism of O. nubilalis eggs was consistently higher in sweet corn than dicotyledonous crops such as pepper, snap bean, broccoli, potato, and melon, in choice and no-choice experiments. Nonetheless, in 2002 and 2003, we made four to five separate inundative releases of approximately 30,000-50,000 T. ostriniae per 0.02 ha in nine pepper fields in Virginia, Pennsylvania, and Massachusetts and compared O. nubilalis egg parasitization and fruit damage in those plots with spatially isolated nonrelease plots. Egg parasitization averaged 48.7% in T. ostriniae release plots, which was significantly higher than in nonrelease plots (1.9%). Also, cumulative pepper fruit damage averaged 8.7% in release plots, which was significantly less than in nonrelease plots (27.3%). In potatoes in 2002 and 2003, we made two releases of approximately 75,000 T. ostriniae per 0.2 ha in nine fields in Maine and Virginia and compared O. nubilalis damage in those plots with that in nonrelease plots. T. ostriniae releases significantly reduced the number of tunnel holes and number of O. nubilalis larvae in potato stems. We conclude that this parasitoid has great potential as a biocontrol agent for O. nubilalis in solanaceous crops.

Arthropod Management Tests, 2021

Arthropod Management Tests, 1998

An experiment was conducted at the Virginia Tech Kentland Farm (Hilltop field) in Montgomery Co.,... more An experiment was conducted at the Virginia Tech Kentland Farm (Hilltop field) in Montgomery Co., VA to determine the effectiveness of several granular insecticides, applied in-furrow or T-band at planting, against WCR larvae on ‘ MA9171’ corn. The experiment was conducted near the center of a 10-acre, no-till cornfield with a predominant Unison-Braddock silt loam soil. The field had been in continuous corn production since 1994, and had been treated with granular insecticides at planting every year since 1995. Plots of 40 X 10 ft (four rows wide) were arranged in a RCBD, with all insecticide treatments and an untreated check replicated four times. An Almaco, 2-row Max-Emerge planter was used to plant the plots on 1 May at the rate of 26,100 seeds/acre. Insecticide granules were applied in front of the presswheels either directly in the seed furrow or in a 5-inch wide T-band over the furrow, depending on the treatment. The standard granular insecticide applicator was removed from ea...

Arthropod Management Tests, 1996

Two experiments were conducted in Mont-gomery Co., VA, to determine the effectiveness of several ... more Two experiments were conducted in Mont-gomery Co., VA, to determine the effectiveness of several granular insecticides applied in-furrow or t-band at planting and a liquid formulation applied postemergence against western corn rootworm larvae on ‘Pioneer 3140’ corn. The experiments were conducted in 2 no-till cornfields consisting of a predominant Duffield-Ernest silt loam soil. Experiment I was in a 20-acre field (‘Back’ field) and Experiment II was in an 8-acre field (‘Machine Shed’ field). The fields had been in continuous corn production since 1988 (Back field) and 1985 (Machine Shed field), and had been treated with granular insecticides at planting every year since 1989 (Back field) and 1990 (Machine Shed field). Plots of 40 X 10 ft (i.e., 4 rows wide) were arranged in a RCB design with all insecticide treatments and an untreated check replicated 4 times. An Almaco, 2-row Max-Emerge planter was used to plant the plots on 12 May at a population density of 26,100 seeds/acre. For...

Arthropod Management Tests, 2007

Arthropod Management Tests, 2007

Arthropod Management Tests, 2005

Arthropod Management Tests, 2007

Journal of Entomological Science, Apr 1, 2014

Journal of Economic Entomology, Feb 13, 2019

Agricultural sciences, 2012

Journal of Economic Entomology, Feb 13, 2019

Plant Health Progress, 2007

Journal of Economic Entomology, Oct 1, 2004

Crop Protection, Jun 1, 2006

Journal of Economic Entomology, Aug 1, 2004

We assessed the ability of Trichogramma ostriniae (Peng &... more We assessed the ability of Trichogramma ostriniae (Peng & Chen) to locate and parasitize Ostrinia nubilalis (Hübner) eggs in crops other than corn, and we evaluated the efficacy of inundative releases of the parasitoid in two solanaceous crops, pepper and potato. Despite a greater plant surface area to search, parasitism of O. nubilalis eggs was consistently higher in sweet corn than dicotyledonous crops such as pepper, snap bean, broccoli, potato, and melon, in choice and no-choice experiments. Nonetheless, in 2002 and 2003, we made four to five separate inundative releases of approximately 30,000-50,000 T. ostriniae per 0.02 ha in nine pepper fields in Virginia, Pennsylvania, and Massachusetts and compared O. nubilalis egg parasitization and fruit damage in those plots with spatially isolated nonrelease plots. Egg parasitization averaged 48.7% in T. ostriniae release plots, which was significantly higher than in nonrelease plots (1.9%). Also, cumulative pepper fruit damage averaged 8.7% in release plots, which was significantly less than in nonrelease plots (27.3%). In potatoes in 2002 and 2003, we made two releases of approximately 75,000 T. ostriniae per 0.2 ha in nine fields in Maine and Virginia and compared O. nubilalis damage in those plots with that in nonrelease plots. T. ostriniae releases significantly reduced the number of tunnel holes and number of O. nubilalis larvae in potato stems. We conclude that this parasitoid has great potential as a biocontrol agent for O. nubilalis in solanaceous crops.