Diurnal effects on sporangium and zoospore production by on 'Cunningham's White'.

We evaluated sporangium and zoospore production by three isolates of on 'Cunningham's White' leaves under light and dark conditions at both variable and constant (14 C) temperature. -infected leaves were detached and placed in funnels inside of a 62-L plastic storage container located in a growth chamber. Cool mist was introduced to the container to create a high-humidity environment.

The Effect of Leaf Wetness on Zoospore Infection of 'Cunningham's White' and .

We performed studies using zoospore inoculum combined from nine isolates of and determined the effect of leaf wetness on infection of whole plants of 'Cunningham's White' and . The mean percentage of infected leaves for both host species increased gradually across a dew chamber moisture period of 1 to 6 h, reaching approximately 80% infection by 6 h. We also evaluated the effect of a postinoculation drying period on infectivity of the two host species with zoospore inoculum.

Annotation and analysis of the mitochondrial genome of Coniothyrium glycines, causal agent of red leaf blotch of soybean, reveals an abundance of homing endonucleases.

Coniothyrium glycines, the causal agent of soybean red leaf blotch, is a USDA APHIS-listed Plant Pathogen Select Agent and potential threat to US agriculture. Sequencing of the C. glycines mt genome revealed a circular 98,533-bp molecule with a mean GC content of 29.

Sporangia Production Over Time by Phytophthora ramorum on Rhododendron 'Cunningham's White' After Placement at Different Relative Humidities.

We examined the impact of relative humidity (RH) on Phytophthora ramorum sporangia production on Rhododendron 'Cunningham's White'. When diseased plants were maintained under continuous moisture in a mist tent, sporangia were collected from some plants for 22 weeks. More than 3,000 sporangia/leaf/week were collected over the first 3 weeks but levels declined to <100 sporangia/leaf/week after 7 weeks.

Development of an Inoculation Technique and the Evaluation of Soybean Genotypes for Resistance to Coniothyrium glycines.

Red leaf blotch, caused by Coniothyrium glycines, is a serious disease affecting soybean in several African countries but has not yet appeared in the United States. The fungal pathogen is listed as a Select Agent by the Federal Select Agent Program because of potential consequence to U.S.