of these differences may be attributed to climatic factors (Is). However, within seasons between adjacent fields, different sucrose concentrations have been measured. Some of these differences may be attributed to variations in early plant growth and N uptake by the sugarbeet plant (16). The objective of this study was to evaluate the effect of several rates and times of N fertilizer applicatio...

It has been demonstrated that the observed ratio of phenotypes of marker enzymes in some sugarbeet plants produced by mitotic agamospermy can be explained by different degrees of endoreduplication of chromosomes carrying different alleles of the enzyme loci. In these plants, different patterns of variability of the enzymes controlled by the linked loci suggest different degrees of endoreduplica...

Aldicarb, carbofuran, fensulfothion, and phenamiphos were tested in concentrations of 1-100 mug/ml for their effects on hatching of Heterodera schachtii. Exposure of cysts to 1 mug aldicarb or carbofuran/ml stimulated hatch whereas phenamiphos and, to a lesser degree, fensulfothion inhibited hatch. Addition of aldicarb to sugarbeet root diffusate or 4 mM zinc chloride suppressed activities of t...

The fungus Fusarium solani (Mart.) Sacc. was discovered as a native entomopathogen of the sugarbeet root maggot, Tetanops myopaeformis (Röder), in the Red River Valley of North Dakota during the 2004 sugarbeet production season. This is the first report of a native pathogen affecting the pupal stage of T. myopaeformis. Forty-four percent of larvae collected from a field site near St. Thomas (Pe...

An opto-electronic sensor system for measuring seed spacing uniformity with different types of seeds is described in this paper. It consisted of a rectangular photogate block (124 × 92 mm) with 24 phototransistors (diameter, 3 mm) receiving light beams from 24 light emitting diodes (diameter, 3 mm) opposite them, a digital input/output board in a personal computer, and power supplies. The opto-...

Sealed membrane vesicles were isolated from homogenates of sugarbeet (Beta vulgaris L.) taproot by a combination of differential centrifugation, extraction with KI, and dextran gradient centrifugation. Relative to the KI-extracted microsomes, the content of plasma membranes, mitochondrial membranes, and Golgi membranes was much reduced in the final vesicle fraction. A component of ATPase activi...