Biology and Management of Bacterial Spot of Peppers in Oklahoma.

Bacterial spot, an important disease of bell and chili peppers grown in Oklahoma, is caused by . We evaluated isolates from 1995 to 2015 ( = 72) for avirulence alleles and race by assessing hypersensitive responses (HRs) on differentials with resistance genes , , , or . Most isolates (96%) expressed (races 1, 3, 7, 8), and only three were virulent on (race 6).

Characterization of the Race Structure of Causing Blackleg of Winter Canola in Oklahoma and Kansas.

Blackleg, caused by the fungus , is a widespread disease of winter canola () in Oklahoma and Kansas. Deployment of genetic resistance is the primary strategy for managing blackleg. Resistance genes () in canola interact with avirulence genes in the fungus () in a gene-for-gene manner.

Survival and growth of foodborne pathogens in pesticide solutions routinely used in leafy green vegetables and tomato production.

Background: The consumption of fresh produce has increased tremendously in the past few years as have outbreaks of foodborne illnesses associated with these commodities. Pesticides routinely used in crop production could influence the outcomes of foodborne pathogen contamination of fresh produce. Experiments were performed to determine the effects of pesticides on the survival and growth characteristics of Escherichia coli O157:H7 and Salmonella spp.

Detection, Survival, and Sources of Inoculum for Bacterial Diseases of Leafy Crucifers in Oklahoma.

Xanthomonas campestris pv. campestris, X. campestris pv.

Bacterial Leaf Spot of Leafy Crucifers in Oklahoma Caused by Pseudomonas syringae pv. maculicola.

During 1995 and 1996, bacterial leaf spots severely damaged fields of kale, spinach mustard, and turnip in Oklahoma. Symptoms were small, brown, necrotic spots with irregular edges surrounded by chlorotic halos. Lesion margins were often water-soaked on the abaxial surface.

Bacterial Leaf Spot Diseases of Leafy Crucifers in Oklahoma Caused by Pathovars of Xanthomonas campestris.

Fields of kale, spinach mustard, and turnip were severely damaged by bacterial leaf spots during 1994 to 1996. Symptoms included circular to angular necrotic lesions with yellow halos and water-soaking on the abaxial leaf surface. Yellow, mucoid strains isolated from leaf spots were identified as Xanthomonas campestris using Biolog.