Genomic markers linked to resistance introgressed from to cultivated potato and their utility in marker-assisted selection.

Unlabelled: is a major threat to potato production in the Pacific Northwest region of the United States. Infected tubers are rendered unmarketable; hence, growers' profitability is adversely affected. Breeding for nematode resistance is a long-term process and phenotyping the segregating populations for nematode resistance is the most time-consuming and laborious part of the process.

Effect of Storage Environment on Hatching of the Cyst Nematode Globodera ellingtonae.

Globodera spp. eggs go through a diapause, which remains dormant until favorable hatching conditions are reached. Because of the regulatory concerns with cyst nematodes, it is often only possible to rear eggs for research in the greenhouse.

Comparison of Meldola's Blue Staining and Hatching Assay with Potato Root Diffusate for Assessment of Globodera sp. Egg Viability.

Laboratory-based methods to test egg viability include staining with Meldola's Blue and/or juvenile (J2) hatching assays using potato root diffusate (PRD). These two methods have not been tested under identical conditions to directly compare their assessments of Globodera egg viability. Using two bioassay strategies, cysts from a Globodera sp.

Plant-Parasitic Nematodes Associated with Reduced Wheat Yield in Oregon: Heterodera avenae.

Heterodera avenae is widely distributed in the western United States, where most wheat is grown in non-irrigated winter wheat/summer fallow rotations in low rainfall regions. Economic and social pressures have motivated growers to pursue a transition from winter wheat/summer fallow rotation to no-till annual spring cereals. Annual cereals are also planted in some irrigated fields.

Soil Fumigant Effects on Three Genera of Potential Soilborne Pathogenic Fungi and Their Effect on Potato Yield in the Columbia Basin of Oregon.

During three years of trials in commercial production fields, populations of three genera of potato pathogens, Fusarium spp, Pythium spp, and Verticillium dahliae, were followed before and after the single or combination use of 1,3-dichloropropene (1,3-D), 1,3-D + 17% chloropicrin (1,3-D + chloropicrin), or metam sodium (MS). Populations of these fungi did not always increase during the growing season but the relative population at a soil depth of 0 to 30 cm was nearly always higher than at 30 to 60 cm, regardless of year, sampling time, or fungal pathogen. The use of MS alone or in combination with 1,3-D generally suppressed recovery of all three genera and also increased yields.