2012 Official Coded Variety Trials

November 2012

Dear ACSC Sugarbeet Grower:

View Trial Procedures

View Official Trial Location Sites

The 2012 official coded variety performance trials and disease nurseries were planted at 20 sites by American Crystal Sugar Company (ACSC) and included 13 yield trial sites. Thanks are extended to the dedicated Technical Services staff involved in official trial plot care, harvest, and analyses.

Results
Results from the Official Variety Trials sites were good to excellent. Five sites were abandoned due to variable emergence dates.Aphanomyces RRV sites experienced dry conditions with very few symptoms which prevented disease ratings and yield evaluations. NoAphanomyces yield trials were harvested in 2012. Rhizomania was not visually observed at any of the harvested sites in 2012. Rhizoctonia was prevalent in 2012 even with two applications of Quadris, a band application shortly after planting and a broadcast treatment at the 6 leaf stage. Revenue calculations in 2012 are based on a hypothetical $51.53 payment at 17.5% sugar and 1.5% SLM and do not consider hauling or production costs.

Fusarium evaluation was conducted at three Moorhead sites. TheRhizoctonia data is from two ACSC Moorhead sites plus a site at the Crookston NWROC. The Aphanomyces data is from Shakopee. TheCercospora data is from Foxhome, MN; Rosemount, MN; and Michigan USDA.

The 2012 data has been combined with the previous years' data, and results are enclosed. The lack of visual rhizomania symptoms prevented categorizing sites based upon infection level, so no tables of moderate to heavy rhizomania are included. Rhizoctonia and Fusariumratings are optional on first year Roundup Ready® entries. Results for the individual sites can be found on the internet.

Rhizoctonia ratings were obtained from three sites in 2012. The results were fairly consistent among the sites and should be more reliable than previous years with fewer nurseries. Data from Ft. Collins USDA was not used due to variability.

Bolter data is presented in percentage of plants. To estimate the number of bolters per acre, multiply the bolter % times 400. For example, a variety with 0.10 % bolters X 400 = 40 bolters / 40,000 plants per acre.

In 2010, official trial seed size requirements were revised to allow planting of pellets in all yield trials. Some varieties that were supplied by seed companies were smaller than specified. This resulted in "plant to thin" plots instead of "plant to stand" plots. The "plant to thin" plots were shorter than the typical plot. Yield, sugar, loss to molasses and emergence were not reported (NA) for commercial varieties. Experimental varieties had short rows considered as gaps with no adjustment. This affects the three-year means on some varieties.

In January 2009, the ACSC Seed Committee exempted the currently approved conventional varieties from continued variety testing - 31 conventional varieties are approved for sale in 2013; many of these varieties were not tested in 2009-2012 yield trials. Conventional trials were discontinued in 2012. Data for conventional varieties tested in 2009-2011 are in Table 3. Data from 2008 conventional trials can be found in Table 4.

More detailed information will be printed later in the Sugarbeet Research and Extension Reports (www.sbreb.org). Additional data including individual yield trial results and agronomic procedures are also on the ACSC web site.

Click here to open a pdf file with the 2012 Grower Info including:

  1. List of varieties approved for sale to ACSC growers
  2. Multi-year performance of RR varieties from ALL SITES
  3. Multi-year (2009-2011 where available) performance of conventional varieties from ALL SITES
  4. 2008 performance of conventional and RR varieties
  5. Trial sites, disease observations and agronomic information from all trial locations
  6. Disease ratings for all nurseries for varieties tested in 2012

Download 2012 Grower Info in Excel format

Links to 2012 data only follow:

Plot Procedures
Roundup Ready and Aphanomyces trials were planted to stand at 4.5 inches. Felton, Eldred, Argyle, Kennedy and Hallock were abandoned due to non-uniform emergence. Kindred and Hillsboro Aphanomycessites were abandoned due to lack of Aphanomyces infection.

Plots were planted crosswise (90°) to the cooperators' normal farming operations, where possible. Plot row lengths for all official trials were maintained at 44 feet with about 37 feet harvested. All trials had two or four-row plots planted in four or six replications. Planting was performed with two vacuum planters, which included a 12-row Hege and a modified 12-row Heath. These planters gave good single seed spacing (with proper seed size) which facilitated emergence counts. All seed was treated with Tachigaren and an insecticide. Emergence counts were taken on 44 feet of each plot. Multiple seedlings were counted as a single plant if they emerged less than one inch apart. The stands in all yield trials were refined by removing doubles (multiple seedlings less than 1.5 inch apart) by hand but were not further reduced.

Roundup Powermax with Event and full rates of fungicides were applied using a pickup sprayer driven down the alleys. Hand weeding was used where necessary. All yield trials were treated with Quadris at planting (15 oz band) and about the 6 leaf stage (14 oz/A broadcast since 2004) for Rhizoctonia control. Agri Tin, Topsin, Proline, and Headline were used for Cercospora control in 2012. Ground spraying was conducted by ACSC technical staff.

RR varieties with commercial seed were planted in four-row, six replication trials. The RR experimental entries were planted in smaller two-row, four replication trials. Two applications of Roundup were made in the 4-6 (32 oz) and 8-12 (22 oz) leaf stages.

All plot rows were measured for total length after approximately 2.5 feet at each end were removed at the end of August, with skips greater than 60 inches (including short rows) being measured for adjustment purposes. Harvest was performed with two modified four-row harvesters (4310 and 4310A John Deere). All harvested beets of each plot were used for yield determination while one sample (approx 25 lbs) for sugar and impurity analysis was obtained from each plot. Quality analysis was performed at the ACSC Technical Services quality lab in Moorhead.

Varieties were planted in disease nurseries in North Dakota, Minnesota, Michigan and Colorado to evaluate varieties for disease tolerance. ACSC adjusts the Cercospora, Aphanomyces, Rhizoctonia and Fusarium nursery data each year to provide a consistent target for variety approval criteria.

Before purchasing seed, please check to make sure the varieties you are buying are on the current approved list. In accordance with the grower contract, the cooperative has the option to refuse to purchase beets of a non-approved variety. If you have questions, please contact the ACSC Technical Services Center or your ACSC Agriculture Department.

Sincerely,
William S. Niehaus
Official Trial Manager