Albert R. Weinhold

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Sodium salicylate (1,000 mug/ml) was delivered through a drip irrigation system to agricultural field soils planted to tomato and infested with Pseudomonas putida PpG7, the host of the salicylate catabolic plasmid NAH7. In nonfumigated soils infested with approximately 10 CFU of PpG7 per g in the top 30 cm, population densities were increased up to 112-fold(More)
Armillaria mellea produced abundant rhizomorphs when grown on a chemically defined medium containing ethanol at concentrations as low as 50 parts per million. In the absence of ethanol no rhizomorphs were formed. Rhizomorph production was also stimulated by I-propanol, isopropanol, and 1-butanol as well as by acetaldehyde (to a lesser extent). Potassium(More)
Respiration and growth of Pseudomonas putida PpG7, containing catabolic plasmid NAH7, was determined in three agricultural field soils amended with the carbon source salicylate. The addition of salicylate to soil significantly increased the population of PpG7. However, there was a lack of relationship between microbial numbers and activity as determined by(More)
Common scab of potato, caused by Streptomyces scabies, is an important disease in many potato growing areas of the world. The persistence of this pathogen in soil and the influence of cultural practices have been the subject of many investigations. Lutman et al (7) reported a situation in which the percentage of badly scabbed tubers in a field had dropped(More)
In a long-term field experiment a soybean cover crop and green manure incorporation prevented the build-up of common scab of potato whereas barley, employed in the same manner, increased disease incidence. When soil from these plots was assayed for organisms antagonistic toS. scabies, a bacterium indentified asBacillus subtilis, was found to be predominant.(More)
The production of antibiotics and their role in microbial competition under natural conditions can be readily studied by the use of transposon mutants. Several antibiotic-producing strains of Erwinia carotovora subsp. betavasculorum were unable to accept foreign DNA. A plasmid delivery system was developed, using ethyl methanesulfonate mutagenesis, which(More)
A series of field tests over a period of 4 growing seasons has shown that Urea-formaldehyde (Uracide) when applied into the furroe at time of planting prvides a very effective control of potato scab. The most satisfactory rate of application to obtain control without phytotoxicity appears to be 20 gal/A. Rates of 25 gal/A and above resulted in reduced(More)
The Department of Plant Pathology at the University of California at Berkeley was destroyed as a consequence of a contentious reorganization. The circumstances that led to the reorganization provide some insight into the challenges facing the discipline of plant pathology. The underlying basis for plant pathology as a science is to address problems of plant(More)
Outstanding men in their respective fields will discuss subjects of mutual interest to producers, shippers, processors, distributors, transportation personnel and education and research agencies. C. D. Buford, vice-president, operations and maintenance department. Association of American Railroads, Washington, D. C., will be the featured speaker at the(More)