Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where J. R. Bohac is active.

Publication


Featured researches published by J. R. Bohac.


Journal of Economic Entomology | 2007

Resistance of Sweetpotato Genotypes to Adult Diabrotica Beetles

D. Michael Jackson; J. R. Bohac

Abstract Production of sweetpotatoes, Ipomoea batatas (L.) Lam. (Convolvulaceae), is limited by several insect pests, including Diabrotica spp. (Coleoptera: Chrysomelidae), and new integrated pest management (IPM) techniques for this crop are needed. Host plant resistance is one attractive approach that fits well into IPM programs. A host plant resistance research program typically depends on reliable bioassay procedures to streamline evaluation of germplasm. Thus, a bioassay technique was developed for evaluating sweetpotato germplasm by using adults of the banded cucumber beetle, Diabrotica balteata LeConte, and spotted cucumber beetle, Diabrotica undecimpunctata howardi Barber. A single beetle was placed on a piece of sweetpotato peel (periderm and cortex with stele removed) that was embedded periderm-side up in plaster in a petri dish. Feeding and longevity of insects on 30 sweetpotato genotypes were evaluated in two experiments by using this procedure. Adult longevity ranged from 7 to 11 d for starved individuals to 211 d for beetles fed a dry artificial diet. Longevity of banded cucumber beetles that fed on sweetpotato peels ranged from 12 d for the most-resistant genotype to 123 d for SC1149-19, a susceptible control cultivar. Longevity of spotted cucumber beetles was slightly shorter than longevity of banded cucumber beetles. For the most resistant sweetpotato genotypes, both Diabrotica species exhibited a significant delay in initiation of feeding, and more beetles died on these genotypes before they had fed. Both antibiosis and nonpreference (antixenosis) are important mechanisms of resistance in sweetpotato genotypes. This bioassay was consistent with field results, indicating that this technique could be useful for evaluating resistance to Diabrotica spp. in sweetpotato genotypes.


Journal of Agricultural and Food Chemistry | 2003

Quantity and Potential Biological Activity of Caffeic Acid in Sweet Potato (Ipomoea batatas (L.) Lam.) Storage Root Periderm

Howard F. Harrison; Joseph K. Peterson; Maurice E. Snook; J. R. Bohac; D. Michael Jackson


Journal of Economic Entomology | 2006

Improved Dry-Fleshed Sweetpotato Genotypes Resistant to Insect Pests

D. Michael Jackson; J. R. Bohac


Hortscience | 2011

‘Liberty’ Dry-fleshed Sweetpotato

D. Michael Jackson; Howard F. Harrison; Judy A. Thies; J. R. Bohac; John D. Mueller


Hortscience | 2001

'White Regal', a multiple-pest and disease-resistant, cream-fleshed sweetpotato

J. R. Bohac; P.D. Dukes; John D. Mueller; Howard F. Harrison; J.K. Peterson; J. M. Schalk; D.M. Jackson; J. Lawrence


Arthropod Management Tests | 2006

EVALUATION OF ADVANCED SWEETPOTATO GENOTYPES FOR RESISTANCE TO SOIL INSECT PESTS, 2004

D. Michael Jackson; J. R. Bohac


Arthropod Management Tests | 2003

EVALUATION OF DRY-FLESHED SWEETPOTATO GERMPLASM FOR RESISTANCE TO SOIL INSECT PESTS , 2001

D. Michael Jackson; J. R. Bohac


Arthropod Management Tests | 2003

EVALUATION OF PLANT INTRODUCTIONS AND DRY-FLESHED SWEETPOTATO GERMPLASM FOR RESISTANCE TO SOIL INSECT PESTS, 1998

D. Michael Jackson; J. R. Bohac; John D. Mueller


Arthropod Management Tests | 2002

EVALUATION OF ADVANCED SWEET POTATO ENTRIES FOR RESISTANCE TO SOIL INSECT PESTS, 1998

D. Michael Jackson; J. R. Bohac; John D. Mueller


Arthropod Management Tests | 2002

EVALUATION OF REGIONAL SWEET POTATO ENTRIES FOR RESISTANCE TO SOIL INSECT PESTS, 1999

D. Michael Jackson; J. R. Bohac; John D. Mueller

Collaboration


Dive into the J. R. Bohac's collaboration.

Top Co-Authors

Avatar

D. Michael Jackson

Agricultural Research Service

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Howard F. Harrison

United States Department of Agriculture

View shared research outputs
Top Co-Authors

Avatar

J. M. Schalk

United States Department of Agriculture

View shared research outputs
Top Co-Authors

Avatar

Joseph K. Peterson

Agricultural Research Service

View shared research outputs
Top Co-Authors

Avatar

Judy A. Thies

Agricultural Research Service

View shared research outputs
Top Co-Authors

Avatar

Maurice E. Snook

Agricultural Research Service

View shared research outputs
Researchain Logo
Decentralizing Knowledge