Detection and Quantification of Sporosori in Soil by Quantitative Real-Time PCR.

Powdery scab on potato tubers is caused by the obligate soilborne biotroph and is known to cause substantial losses in potato production. The pathogen also infects roots of susceptible hosts, forming galls which can negatively affect root function. is also the vector of , which causes a tuber necrosis disease that can, depending on temperature and cultivar, render potato tubers unmarketable.

Quantifying Control Efficacy of Fungicides Commonly Applied for Potato Early Blight Management.

Early blight is an economically important foliar disease of potato in the United States. Because of the lack of resistant potato cultivars, fungicides are applied extensively to obtain adequate control. To manage early blight, standard protectant fungicides and single-site mode-of-action "specialty" fungicides are applied either alone or incorporated into a fungicide rotation program.

Assessing Potato Cultivar Sensitivity to Tuber Necrosis Caused by Tobacco rattle virus.

Tobacco rattle virus (TRV) causes the economically important corky ring spot disease in potato. Chemical control is difficult due to the soilborne nature of the TRV-transmitting nematode vector, and identifying natural host resistance against TRV is considered to be the optimal control measure. The present study investigated the sensitivity of 63 cultivars representing all market types (evaluated at North Dakota and Washington over 2 years) for the incidence of TRV-induced tuber necrosis and severity.

Spatial and Temporal Distribution of Mutations Conferring QoI and SDHI Resistance in Alternaria solani Across the United States.

The application of succinate dehydrogenase inhibiting (SDHI) and quinone outside inhibiting (QoI) fungicide chemistries is a primary tactic in the management of early blight of potato, caused by Alternaria solani. Resistance to QoIs in A. solani has been attributed to the F129L mutation, while resistance to SDHIs is conferred by five different known point mutations on three AsSdh genes.

Potential Impact of Fluopyram on the Frequency of the D123E Mutation in Alternaria solani.

Succinate dehydrogenase-inhibiting (SDHI) fungicides have been widely applied in commercial potato (Solanum tuberosum L.) fields for the control of early blight, caused by Alternaria solani Sorauer. Five-point mutations on three AsSdh genes in A.